K8AK / K8DS Series Measuring & Monitoring Relays/Specifications

Model	*Range 1**	Connection terminal	Setting range	Input impedance	Input type	Overload capacity
K8AK-AS1	0 to 20 mA AC/DC	I1-COM	2 to 20 mA AC/DC, 10 to 100 mA AC/DC, 50 to 500 mA AC/DC	Approx. 5 Ω	Direct input	Continuous input at 120% of maximum input 1 s at 150%
	0 to 100 mA AC/DC	I2-COM		Approx. 1 Ω	Direct input
	0 to 500 mA AC/DC	I3-COM		Approx. 0.2 Ω	Direct input
K8AK-AS2	0 to 1 A AC/DC	I1-COM	0.1 to 1 A AC/DC, 0.5 to 5 A AC/DC, 0.8 to 8 A AC/DC	Approx. 0.12 Ω (Load: 0.5 VA)	Direct input or commercially available CT
	0 to 5 A AC/DC	I2-COM		Approx. 0.02 Ω (Load: 1.5 VA)	Direct input or commercially available CT
	0 to 8 A AC/DC	I3-COM		Approx. 0.02 Ω (Load: 3 VA)	---
K8AK-AS3	0 to 100 A AC	I2-COM	10 to 100 A AC 2, 20 to 200 A AC 2	---	OMRON CT	Continuous input at 120% with an OMRON CT (K8AC-CT200L). 30 s at 200% 1 s at 600% * CT capacity on primary side.
K8AK-AS3	0 to 200 A AC	I3-COM	10 to 100 A AC 2, 20 to 200 A AC 2	---	OMRON CT

*1 The range is selected using connected terminals.
*2 The K8AK-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT).
(Direct input is not possible.)

Power supply voltage	Isolated power supply	24 VAC/DC 100 to 240 VAC
Power consumption		24 VAC/DC: 2.0 VA/1.1 W max. 100 to 240 VAC: 4.6 VA max.
Operating value setting range (SV)		10% to 100% of the maximum value of the setting range K8AK-AS1: 2 to 20 mA AC/DC 10 to 100 mA AC/DC 50 to 500 mA AC/DC K8AK-AS2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.) 0.5 to 5 A AC/DC (Compatible with commercially available CTs.) 0.8 to 8 A AC/DC K8AK-AS3: When used with the OMRON CT (K8AC-CT200L). 10 to 100 A AC 20 to 200 A AC
Operating value		100% operation at set value
Reset value setting range (HYS.)		5% to 50% of operating value
Reset method		Manual reset/automatic reset (switchable) Note: Manual reset: Turn OFF power supply for 1 s or longer.
Operating time setting range (T)		0.1 to 30 s
Startup lock time setting range (LOCK) Note: Enabled only for overcurrent operation.		0 to 30 s (The startup lock timer starts when the input has reached approximately 30% or more of the set value.) Note: Enabled only for overcurrent operation.
Indicators		Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Input impedance		Refer to Input Range on this page.
Output relays		One SPDT relay (NO/NC switched using DIP switch.)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC:100,000 operations
Ambient operating temperature		-20 to 60°C (with no condensation or icing)
Storage temperature		-25 to 65°C (with no condensation or icing)
Ambient operating humidity		25% to 85% (with no condensation)
Storage humidity		25% to 85% (with no condensation)
Altitude		2,000 m max.
Terminal screw tightening torque		0.49 N·m
Terminal wiring method		Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color		N1.5
Case material		PC and ABS
Weight		Approx. 150 g
Mounting		Mounts to DIN Track
Dimensions		22.5 × 90 × 100 mm (W × H × D)

Allowable operating voltage range		85% to 110% of power supply voltage
Allowable operating frequency range		50/60 Hz ±5 Hz
Input frequency range		K8AK-AS1 and K8AK-AS2: DC input or AC input (45 to 65 Hz) K8AK-AS3: AC input (45 to 65 Hz)
Overload capacity		K8AK-AS1 and K8AK-AS2: Continuous input at 120% of maximum input, 1 s at 150% K8AK-AS3: Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L) Note: Overload capacity of primary side of CT.
Repeat error	Operating value	±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60 Hz sine wave input)
Repeat error	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14,CCC: GB14048.5
Insulation resistance		20 MΩ min. Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals
Dielectric strength		2,000 VAC for one minute Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency 10 to 55 Hz, 0.35-mm single amplitude, acceleration 50 m/s² 10 sweeps of 5 min each in X, Y, and Z directions
Shock resistance		150 m/s², 3 times each in 6 directions along 3 axes Or 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

The following diagram shows the relationship between the mounting distances and the input current. If the relay is used with an input current that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.

Model	*Range 1**	Connection terminals	Setting range	Input impedance	Input type	Overload capacity
K8AK-AW1	0 to 20 mA AC/DC	I1-COM	2 to 20 mA AC/DC 10 to 100 mA AC/DC 50 to 500 mA AC/DC	Approx. 5 Ω	Direct input	Continuous input at 120% of maximum input. 1 s at 150%
	0 to 100 mA AC/DC	I2-COM		Approx. 1 Ω	Direct input
	0 to 500 mA AC/DC	I3-COM		Approx. 0.2 Ω	Direct input
K8AK-AW2	0 to 1 A AC/DC	I1-COM	0.1 to 1 A AC/DC 0.5 to 5 A AC/DC	Approx. 0.12 Ω (Load: 0.5 VA)	Direct input or commercially available CT
K8AK-AW2	0 to 5 A AC/DC	I2-COM	0.1 to 1 A AC/DC 0.5 to 5 A AC/DC	Approx. 0.02 Ω (Load: 1.5 VA)	Direct input or commercially available CT
K8AK-AW3	0 to 100 A AC	I2-COM	10 to 100 A AC 2 20 to 200 A AC 2	---	OMRON CT	Continuous input at 120% with an OMRON CT (K8AC-CT200L). 30 s at 200% 1 s at 600% * CT capacity on primary side.
K8AK-AW3	0 to 200 A AC	I3-COM	10 to 100 A AC 2 20 to 200 A AC 2	---	OMRON CT

*1 The range is selected using connected terminals.
*2 The K8AK-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT).
(Direct input is not possible.)

Power supply voltage	Isolated power supply	24 VAC/DC 100 to 240 VAC
Power consumption		24 VAC/DC: 2.0 VA/1.1 W max. 100 to 240 VAC: 4.6 VA max.
Operating value setting range (SV)		10% to 100% of the maximum value of the setting range K8AK-AW1: 2 to 20 mA AC/DC 10 to 100 mA AC/DC 50 to 500 mA AC/DC K8AK-AW2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.) 0.5 to 5 A AC/DC (Compatible with commercially available CTs.) K8AK-AW3: When used with the OMRON CT (K8AC-CT200L). 10 to 100 A AC 20 to 200 A AC
Operating value		100% operation at set value
Reset value		5% of operating value (fixed)
Reset method		Manual reset/automatic reset (switchable) Note: Manual reset: Turn OFF power supply for 1 s or longer.
Operating time setting range (T)		0.1 to 30 s
Startup lock time setting range (LOCK) Note: Enabled only for overcurrent operation.		0 to 30 s (The startup lock timer starts when the input has reached approximately 30% or more of the set value.) Note: Enabled only for overcurrent operation.
Indicators		Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Input impedance		Refer to Input Range on previous page.
Output relays		Two SPDT relay outputs (normally closed operation)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC: 100,000 operations
Ambient operating temperature		-20 to 60°C (with no condensation or icing)
Storage temperature		-25 to 65°C (with no condensation or icing)
Ambient operating humidity		25% to 85% (with no condensation)
Storage humidity		25% to 85% (with no condensation)
Altitude		2,000 m max.
Terminal screw tightening torque		0.49 N·m
Terminal wiring method		Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color		N1.5
Case material		PC and ABS
Weight		Approx. 150 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W × H × D)

Allowable operating voltage range		85% to 110% of power supply voltage
Allowable operating frequency range		50/60 Hz ±5 Hz
Input frequency range		K8AK-AW1 and K8AK-AW2: DC input or AC input (45 to 65 Hz) K8AK-AW3: AC input (45 to 65 Hz)
Overload capacity		K8AK-AW1 and K8AK-AW2: Continuous input at 120% of maximum input, 1 s at 150% K8AK-AW3: Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L). Note: CT capacity on primary side.
Repeat accuracy	Operating value	±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60 Hz sine wave input)
Repeat accuracy	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14,CCC: GB14048.5
Insulation resistance		20 MΩ min. Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals
Dielectric strength		2,000 VAC for one minute Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s², 3 times each in 6 directions along 3 axes Or 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

The following diagram shows the relationship between the mounting distances and the input current.
If the relay is used with an input current that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.

Model	Range *	Connection terminal	Setting range	Input impedance	Overload capacity
K8AK-VS2	0 to 10 V AC/DC	V1-COM	1 to 10 V AC/DC, 3 to 30 V AC/DC, 15 to 150 V AC/DC	Approx. 120 kΩ	Continuous input at 115% of maximum input 10 s at 125% (up to 600 VAC)
	0 to 30 V AC/DC	V2-COM		Approx. 320 kΩ
	0 to 150 V AC/DC	V3-COM		Approx. 1.6 MΩ
K8AK-VS3	0 to 200 V AC/DC	V1-COM	20 to 200 V AC/DC, 30 to 300 V AC/DC, 60 to 600 V AC/DC	Approx. 1.2 MΩ
	0 to 300 V AC/DC	V2-COM		Approx. 1.7 MΩ
	0 to 600 V AC/DC	V3-COM		Approx. 3.1 MΩ

* The range is selected using connected terminals.

Power supply voltage	Isolated power supply	24 VAC/DC 100 to 240 VAC
Power consumption		24 VAC/DC: 2.0 VA/1.1 W max. 100 to 240 VAC: 4.6 VA max.
Operating value setting range (SV)		10% to 100% of maximum setting range K8AK-VS2: 1 to 10 V AC/DC 3 to 30 V AC/DC 15 to 150 V AC/DC K8AK-VS3: 20 to 200 V AC/DC 30 to 300 V AC/DC 60 to 600 V AC/DC
Operating value		100% operation at set value
Reset value setting range (HYS.)		5% to 50% of operating value
Reset method		Manual reset/automatic reset (switchable) Note: Manual reset: Turn OFF power supply for 1 s or longer.
Operating time setting range (T)		0.1 to 30 s
Power ON lock time (LOCK)		1 s or 5 s (Switched using DIP switch.)
Indicators		Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Input impedance		Refer to Input Range on previous page.
Output relays		One SPDT relay (NO/NC switched using DIP switch.)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC or 30 VDC: 100,000 operations
Ambient operating temperature		-20 to 60°C (with no condensation or icing)
Storage temperature		-25 to 65°C (with no condensation or icing)
Ambient operating humidity		25% to 85% (with no condensation)
Storage humidity		25% to 85% (with no condensation)
Altitude		2,000 m max.
Terminal screw tightening torque		0.49 N·m
Terminal wiring method		Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color		N1.5
Case material		PC and ABS
Weight		Approx. 150 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W × H × D)

Allowable operating voltage range		85% to 110% of rated power supply voltage
Allowable operating frequency range		50/60 Hz ±5 Hz
Input frequency		40 to 500 Hz
Overload capacity		Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC).
Repeat accuracy	Operating value	±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60 Hz sine wave input)
Repeat accuracy	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance		20 MΩ min. Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals
Dielectric strength		2,000 VAC for one minute Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s² 3 times each in 6 directions along 3 axes. Or 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

Model	Range *	Connection terminal	Setting range	Input impedance	Overload capacity
K8AK-VW2	0 to 10 V AC/DC	V1-COM	1 to 10 V AC/DC 3 to 30 V AC/DC 15 to 150 V AC/DC	Approx. 120 kΩ	Continuous input at 115% of maximum input. 10 s at 125% (up to 600 VAC)
	0 to 30 V AC/DC	V2-COM		Approx. 320 kΩ
	0 to 150 V AC/DC	V3-COM		Approx. 1.6 MΩ
K8AK-VW3	0 to 200 V AC/DC	V1-COM	20 to 200 V AC/DC 30 to 300 V AC/DC 60 to 600 V AC/DC	Approx. 1.2 MΩ
	0 to 300 V AC/DC	V2-COM		Approx. 1.7 MΩ
	0 to 600 V AC/DC	V3-COM		Approx. 3.1 MΩ

* The range is selected using connected terminals.

Power supply voltage	Isolated power supply	24 VAC/DC 100 to 240 VAC
Power consumption		24 VAC/DC: 2.0 VA/1.1 W max. 100 to 240 VAC: 4.6 VA max.
Operating value setting range (AL1 and AL2)		10% to 100% of the maximum value of the setting range K8AK-VW2: 1 to 10 V AC/DC 3 to 30 V AC/DC 15 to 150 V AC/DC K8AK-VW3: 20 to 200 V AC/DC 30 to 300 V AC/DC 60 to 600 V AC/DC
Operating value		100% operation at set value
Reset value		5% of operating value (fixed)
Reset method		Manual reset/automatic reset (switchable) Note: Manual reset: Turn OFF power supply for 1 s or longer.
Operating time setting range (T)		0.1 to 30 s
Power ON lock time (LOCK)		1 s or 5 s (Switched using DIP switch.)
Indicators		Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (AL1, AL2): Red
Input impedance		Refer to Input Range on previous page.
Output relays		Two SPDT relays (NC operation)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC or 30 VDC: 100,000 operations
Ambient operating temperature		-20 to 60°C (with no condensation or icing)
Storage temperature		-25 to 65°C (with no condensation or icing)
Ambient operating humidity		25% to 85% (with no condensation)
Storage humidity		25% to 85% (with no condensation)
Altitude		2,000 m max.
Terminal screw tightening torque		0.49 N·m
Terminal wiring method		Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color		N1.5
Case material		PC and ABS
Weight		Approx. 150 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W × H × D)

Allowable operating voltage range		85% to 110% of rated power supply voltage
Allowable operating frequency range		50/60 Hz ±5 Hz
Input frequency range		40 to 500 Hz
Overload capacity		Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC).
Repeat error	Operating value	±0.5% full scale (at 25°C and an ambient humidity of 65% at the rated power supply voltage, DC and 50/60 Hz sine wave input)
Repeat error	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance		20 MΩ min. Between all external terminals and the case Between all power supply terminals and all input terminals Between all power supply terminals and all output terminals Between all input terminals and all output terminals
Dielectric strength		2,000 VAC for 1 min Between all external terminals and the case Between all power supply terminals and all input terminals Between all power supply terminals and all output terminals Between all input terminals and all output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s² 3 times each in 6 directions along 3 axes. Or 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

Rated input voltage	3-phase, 200 to 480 VAC (3-wire)
Input load	Approx. 2.7 VA
Reversed phase and phase loss operating time	0.1 s max.
Reset method	Automatic reset
Indicators	Power (PWR): Green, Relay output (RY): Yellow
Output relays	One SPDT relay (NC operation)
Output relay ratings	Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Max. switching voltage 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC:50,000 operations 3 A at 250 VAC/30 VDC:100,000 operations
Ambient operating temperature	-20 to 60°C (with no condensation or icing)
Storage temperature	-25 to 65°C (with no condensation or icing)
Ambient operating humidity	25% to 85% (with no condensation)
Storage humidity	25% to 85% (with no condensation)
Altitude	2,000 m max.
Terminal screw tightening torque	0.49 N·m
Terminal wiring method	Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color	N1.5
Case material	PC and ABS
Weight	Approx. 60 g
Mounting	Mounts to DIN Track.
Dimensions	17.5 × 80 × 73 mm (W × D × H)

Input voltage range		200 to 480 VAC
Input frequency		50/60 Hz (no presumed range)
Overload capacity		Continuous 500 V
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance		20 MΩ min. Between external terminals and case Between input terminals and output terminals
Dielectric strength		2,000 VAC for one minute Between external terminals and case Between input terminals and output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s², 3 times each in 6 directions along 3 axes However, 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

The following diagram shows the relationship between the mounting distances and the ambient temperature.
If the relay is used with an ambient temperature that exceeds these values, the temperature of the K8DS may rise and shorten the life of the internal components.

Rated input voltage	3-phase, 200 to 480 VAC (3-wire)
Input load	Approx. 4.1 VA
Reversed phase and phase loss operating time	0.1 s max.
Reset method	Automatic reset
Indicators	Power (PWR): Green, Relay output (RY): Yellow
Output relays	One DPDT relay (NC operation)
Output relay ratings	Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Max. switching voltage 250 VAC or 30 VDC Max. switching current: 5 A Minimum load: 24 VDC, 40 mA Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC:100,000 operations
Ambient operating temperature	-20 to 60°C (with no condensation or icing)
Storage temperature	-25 to 65°C (with no condensation or icing)
Ambient operating humidity	25% to 85% (with no condensation)
Storage humidity	25% to 85% (with no condensation)
Altitude	2,000 m max.
Terminal screw tightening torque	0.49 N·m
Terminal wiring method	Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color	N1.5
Case material	PC and ABS
Weight	Approx. 130 g
Mounting	Mounts to DIN Track.
Dimensions	22.5 × 90 × 100 mm (W × H × D)

Input voltage range		200 to 480 VAC
Input frequency		50/60 Hz (no presumed range)
Overload capacity		Continuous 528 V
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance		20 MΩ min. Between external terminals and case Between input terminals and output terminals
Dielectric strength		2,000 VAC for one minute Between external terminals and case Between input terminals and output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s², 3 times each in 6 directions along 3 axes However, 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

The following diagram shows the relationship between the mounting distances and the ambient temperature.
If the relay is used with an ambient temperature that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.

Rated input voltage	K8AK-PW1	Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC
Rated input voltage	K8AK-PW2	Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC
Input load		K8AK-PW1: Approx. 4.4 VA K8AK-PW2: Approx. 4.4 VA
Operating value setting range (OVER, UNDER)		Overvoltage -30% to 25% of rated input voltage Undervoltage -30% to 25% of rated input voltage Note: The rated input voltage can be switched using the DIP switch.
Operating value		100% operation at set value
Reset value		5% of operating value (fixed)
Reset method		Automatic reset
Operating time setting range (T)		Overvoltage and undervoltage: 0.1 to 30 s
Startup lock time (LOCK)		1 s/5 s (Changed with the DIP switch.)
Indicators		Power (PWR): Green, Relay output (RY): Yellow, OVER/UNDER: Red
Output relays		Two SPDT relays (NC operation)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC:50,000 operations 3 A at 250 VAC/30 VDC:100,000 operations
Ambient operating temperature		-20 to 60°C (with no condensation or icing)
Storage temperature		-25 to 65°C (with no condensation or icing)
Ambient operating humidity		25% to 85% (with no condensation)
Storage humidity		25% to 85% (with no condensation)
Altitude		2,000 m max.
Terminal screw tightening torque		0.49 N·m
Terminal wiring method		Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color		N1.5
Case material		PC and ABS
Weight		Approx. 150 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W × H × D)

Input frequency range		50/60 Hz
Overload capacity		Continuous input at 115% of maximum input. 10 s at 125%. (up to 600 VAC)
Repeat accuracy	Operating value	±0.5% full scale (at 25°C and an ambient humidity of 65% at the rated power supply voltage, DC and 50/60 Hz sine wave input)
Repeat accuracy	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance		20 MΩ Between all external terminals and the case Between all input terminals and all output terminals
Dielectric strength		2,000 VAC for 1 min Between all external terminals and the case Between all input terminals and all output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s², 3 times each in 6 directions along 3 axes However, 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

The following diagram shows the relationship between the mounting distances and the ambient temperature.
If the relay is used with an ambient temperature that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.

Rated input voltage	K8AK-PM1	Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC
Rated input voltage	K8AK-PM2	Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC
Input load		K8AK-PM1: Approx. 4.4 VA K8AK-PM2: Approx. 4.4 VA
Operating value setting range (OVER, UNDER)		Overvoltage -30% to 25% of rated input voltage Undervoltage -30% to 25% of rated input voltage Note: The rated input voltage can be switched using the DIP switch.
Operating value		100% operation at set value
Reset value		5% of operating value (fixed)
Reset method		Automatic reset
Operating time setting range (T)	Overvoltage/undervoltage	0.1 to 30 s
Operating time setting range (T)	Reversed phase/phase loss	0.1 s
Startup lock time (LOCK)		1 s or 5 s (Switched using DIP switch.)
Indicators		Power (PWR): Green, Relay output (RY): Yellow, OVER/UNDER: Red
Output relays		Two SPDT relays (NC operation)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC: 100,000 operations
Ambient operating temperature		-20 to 60°C (with no condensation or icing)
Storage temperature		-25 to 65°C (with no condensation or icing)
Ambient operating humidity		25% to 85% (with no condensation)
Storage humidity		25% to 85% (with no condensation)
Altitude		2,000 m max.
Terminal screw tightening torque		0.49 N·m
Terminal wiring method		Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color		N1.5
Case material		PC and ABS
Weight		Approx. 150 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W × H × D)

Input frequency		50/60 Hz
Overload capacity		Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC).
Repeat accuracy	Operating value	±0.5% full scale (at 25°C and an ambient humidity of 65% at the rated power supply voltage, DC and 50/60 Hz sine wave input)
Repeat accuracy	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance		20 MΩ Between all external terminals and the case Between all input terminals and all output terminals
Dielectric strength		2,000 VAC for 1 min Between all external terminals and the case Between all input terminals and all output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s², 3 times each in 6 directions along 3 axes However, 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

The following diagram shows the relationship between the mounting distances and the ambient temperature.
If the relay is used with an ambient temperature that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.

Rated input voltage	K8AK-PA1	Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC
Rated input voltage	K8AK-PA2	Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC
Input load		K8AK-PA1: Approx. 4.4 VA K8AK-PA2: Approx. 4.4 VA
Operating value setting range (ASY.)		Asymmetry set value: 2% to 22%
Operating value		Asymmetry operating value = Rated input voltage × Asymmetry set value (%) The asymmetry operation will function when the potential difference between the highest and lowest voltage phases equals or exceeds the asymmetry operating value.
Reset value setting range (HYS.)		5% of operating value (fixed)
Reset method		Automatic reset
Operating time setting range (T)	Asymmetry	0.1 to 30 s
Operating time setting range (T)	Reversed phase/ phase loss	0.1 s
Startup lock time (LOCK)		1 s/5 s (Changed with the DIP switch.)
Indicators		Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Output relays		One SPDT relay (NC operation)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC: 100,000 operations
Ambient operating temperature		-20 to 60°C (with no condensation or icing)
Storage temperature		-25 to 65°C (with no condensation or icing)
Ambient operating humidity		25% to 85% (with no condensation)
Storage humidity		25% to 85% (with no condensation)
Altitude		2,000 m max.
Terminal screw tightening torque		0.49 Nm
Terminal wiring method		Recommended wire Solid wire: 2.5 mm² Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color		N1.5
Case material		PC and ABS
Weight		Approx. 130 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W × H × D)

Input frequency		50/60 Hz
Overload capacity		Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC).
Repeat accuracy	Operating value	±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, 50/60 Hz sine wave input)
Repeat accuracy	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable standards	Conforming standards	EN60947-5-1 Installation environment (pollution level 2, installation category III)
	EMC	EN60947-5-1
	Safety standards	UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance		20 MΩ min. Between external terminals and case Between input terminals and output terminals
Dielectric strength		2,000 VAC for one minute Between external terminals and case Between input terminals and output terminals
Noise immunity		1,500 V power supply terminal common/normal mode Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance		Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance		150 m/s², 3 times each in 6 directions along 3 axes However, 100 m/s² for relay contacts.
Degree of protection		Terminals: IP20

The following diagram shows the relationship between the mounting distances and the ambient temperature.
If the relay is used with an ambient temperature that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.

Power supply voltage		100 to 240 VAC 50/60 Hz	24 VAC 50/60 Hz or 24 VDC
Allowable voltage range		85% to 110% of power supply voltage
Power consumption		5 VA max.	2 W max. (24 VDC), 4 VA max. (24 VAC)
Sensor inputs	K8AK-TH11S	Thermocouple: K, J, T, E; Platinum-resistance thermometer: Pt100, Pt1000
Sensor inputs	K8AK-TH12S	Thermocouple: K, J, T, E, B, R, S, PLII
Output relay		One SPDT relay (5 A at 250 VAC, resistive load)
External inputs (for latch setting)	Contact input	ON: 1 kΩ max., OFF: 100 kΩ min.
	Non-contact input	ON residual voltage: 1.5 V max., OFF leakage current: 0.1 mA max.
		Leakage current: Approx. 10 mA
Setting method		Rotary switch setting (set of three switches)
Indicators		Power (PWR): Green LED, Relay output (ALM): Red LED
Other functions		Alarm Mode (upper limit/lower limit), non-fail safe/fail safe selection, output latch, setting protection, temperature unit °C/°F
Ambient operating temperature		-20 to 55°C (with no condensation or icing)
Ambient operating humidity		Relative humidity: 25% to 85%
Storage temperature		-25 to 65°C (with no condensation or icing)

Measurement accuracy		±1% of the setting range
hysteresis width		2°C
Output relay		1 SPDT relay output 5 A at 250 VAC or 30 VDC (resistive load) Electrical life: 50,000 operations. 3 A at 250 VAC or 30 VDC (resistive load) Electrical life: 100,000 operations
Sampling cycle		100 ms
Insulation resistance		20 MΩ (at 500 V) between charged terminals and exposed uncharged parts 20 MΩ (at 500 V) between any charged terminals (i.e., between input, output, and power supply terminals) 20 MΩ (at 500 V) between contacts (open)
Dielectric strength		2,300 VAC, 50/60 Hz for 1 min between terminals of different charge
Vibration resistance		Vibration of 10 to 55 Hz and acceleration of 50 m/s² for 5 min with 10 sweeps each in X, Y, and Z directions
Shock resistance		150 m/s² (100 m/s² for relay contacts) 3 times each in 6 directions in X, Y, and Z directions
Weight		Approx. 160 g
Degree of protection		IP20
Memory protection		Non-volatile memory (number of writes: 1 million)
Safety Standards	Approved standards	UL 61010-1 Installation environment (pollution level 2, installation category II)
	EMC	EN 61326-1
	Application standards	UL 61010-1, Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Terminal screw tightening torque		0.49 N·m
Crimp terminals		Two solid wires of 2.5 mm² or two ferrules of 1.5 mm² with insulation sleeves can be tightened together.
Case color		N1.5
Case material		PC and ABS
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 100 × 90 mm (W × D × H)

TH11S	°C		°F
Input type	Lower limit	Upper limit	Lower limit	Upper limit
K	-20	1019	-40	1039
J	-20	870	-40	1039
T	-20	420	-40	740
E	-20	620	-40	1039
Pt100	-20	870	-40	1039
Pt1000	-20	870	-40	1039

TH12S	°C		°F
Input type	Lower limit	Upper limit	Lower limit	Upper limit
K	-20	1320	-40	2340
J	-20	870	-40	1540
T	-20	420	-40	740
E	-20	620	-40	1140
B	0	1820	0	3240
R	-20	1720	-40	3040
S	-20	1720	-40	3040
PLII	-20	1320	-40	2340

Rated voltage	24 VAC 50/60 Hz or 24 VDC 100 to 240 VAC 50/60 Hz
Voltage across elec-trodes	5 V p-p (Approx. 20 Hz)
Power consumption	24 VAC/DC: 2.0 VA/1.1 W max. 100 to 240 VAC: 4.6 VA max.
Operating resistance	10 to 100 kΩ (variable)
Reset resistance	250 kΩ max.
Response time	Approx. 0.1 to 10 s (variable)
Length of cable	100 m max. (fully insulated 3-core 0.75-mm² cab-tyre cable, 600 V)
Indicators	PWR: Green, RY: Yellow
Output contact ratings	Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum contact voltage: 250 VAC or 30 VDC Max. switching current: 5 A Maximum switching capacity: 1,250 VA, 150 W Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC: 100,000 operations
Ambient operating tem-perature	-20 to 60°C (with no condensation or icing)
Storage temperature	-25 to 65°C (with no condensation or icing)
Ambient humidity	25% to 85% (with no condensation)
Storage humidity	25% to 85% (with no condensation)
Altitude	2,000 m max.
Terminal screw tighten-ing torque	0.49 N・m
Case color	N1.5
Case material	PC and ABS
Weight	Approx. 150 g
Mounting	Mounts to DIN Track.
Dimensions	22.5 × 90 × 100 mm (W × D × H)

Operating voltage range	85% to 110% of rated voltage
Installation environ-ment	Installation category II, pollution level 2
Approved standards	EN61010-1
EMC	EN61326-1
Safety standards	EN 60664-1, UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14, CCC: GB14048.5
Insulation resistance	20 MΩ min. Between all external terminals and the case Between all power supply terminals and all input terminals Between all power supply terminals and all output terminals Between all input terminals and all output termi-nals
Dielectric strength	2,000 VAC for 1 min Between all external terminals and the case Between all power supply terminals and all input terminals Between all power supply terminals and all output terminals Between all input terminals and all output termi-nals
Noise immunity	1,500 V power supply terminal common/normal mode Square-wave noise of ±1-μs/100-ns pulse width with 1-ns rise time
Vibration resistance	Frequency: 10 to 55 Hz, acceleration 50 m/s² 10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance	150 m/s², 3 times each in 6 directions along 3 axes However, 100 m/s² for relay contacts.
Degree of protection	Terminals: IP20

K8AK / K8DS Series

DIN 22.5/17.5 Size Lineup of A Wide Range of Measuring and Monitoring Relays

K8AK-AS Single-phase Current Relay

Input Range

Ratings

Specifications

Relationship of Mounting Distance between K8AK-AS Relays and Input Current (Reference Values)

K8AK-AW Single-phase Overcurrent/Undercurrent Relays

Input Range

Ratings

Specifications

Relationship of Mounting Distance between K8AK-AW Relays and Input Current (Reference Values)

K8AK-VS Single-phase Voltage Relay

Input Range

Ratings

Specifications

K8AK-VW Single-phase Overvoltage/Undervoltage Relays

Input Range

Ratings

Specifications

K8DS-PH Phase-sequence Phase-loss Relay

Ratings

Specifications

Relationship of Mounting Distance between K8DS-PH Relays and Ambient Temperature (Reference Values)

K8AK-PH Phase-sequence Phase-loss Relay

Ratings

Specifications

Relationship of Mounting Distance between K8AK-PH Relays and Ambient Temperature (Reference Values)

K8AK-PW Three-phase Voltage Relay

Ratings

Specifications

Relationship of Mounting Distance between K8AK-PW Relays and Ambient Temperature (Reference Values)

K8AK-PM Three-phase Phase-sequence Phase-loss Relay

Ratings

Specifications

Relationship of Mounting Distance between K8AK-PM Relays and Ambient Temperature (Reference Values)

K8AK-PA Three-phase Asymmetry and Phase-sequence Phase-loss Relay

Ratings

Specifications

Relationship of Mounting Distance between K8AK-PA Relays and Ambient Temperature (Reference Values)

K8AK-TH Temperature Monitoring Relay

Ratings

Characteristics

Setting Ranges

K8AK-TH11S

Centigrade

Fahrenheit

K8AK-TH12S

Centigrade

Fahrenheit

Temperature Input Range

K8AK-LS Conductive Level Controller

Ratings

Specifications

Product Category