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K8AK-TS / PT

Thermistor Motor Protection Relay

K8AK-TS / PT

Monitor Temperature Rise through Internal Motor Loss

Ratings

Power supply
voltage
Isolated power supply 24 VAC/DC
100 to 240 VAC
Power consumption 24 VAC/DC: 1.8 VA/1.0 W max.
100 to 240 VAC: 3.5 VA max.
Rated input voltage 3-phase, 200 to 480 VAC (3-wire)
Operating
time
Phase sequence on three-
phase voltage input
0.1 s±0.05 s
Phase loss on three-phase
voltage input
0.1 s max. (when the voltage changes rapidly from 100% to 0% of rated
voltage)
PTC thermistor input 0.2 s max.
Reset method Manual reset/automatic reset (switchable)
Note: Manual reset method: Press the TEST/RESET button.
Indicators Power (PWR): Green, PH_Alarm outputs (ALM): Red, TS_Alarm outputs
(ALM): Red
Output relays One SPDT relay output (normally closed operation)
Output relay ratings Rated load
Resistive load
5 A at 250 VAC
5 A at 30 VDC
Maximum switching capacity: 1,250 VA, 150 W
Minimum load: 5 VDC, 10 mA (reference values)
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 to 0.59 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, UL 94 V-0
Weight Approx. 150 g
Mounting Mounts to DIN Track.
Dimensions 22.5 × 90 × 100 mm (W × H × D)

Specifications

Allowable operating voltage range 85% to 110% of rated power supply voltage
Allowable operating frequency range 50/60 Hz ±5 Hz
Input frequency 50/60 Hz
Input overload capacity Continuous 528 V
Phase loss detection level 80%±10% of rated input
If any phase-to-phase voltage drops to 80%±10% of the other phase-to-
phase voltages, voltage asymmetry is detected and the phase loss function is
performed.
PTC
thermistor
Operating value precision 3,100 Ω ±5%
Reset value precision 1,650 Ω ±5%
Short circuit detection
value precision
0 to 10 Ω ±5 Ω
Temperature drift ±0.1%/°C max.
Operating time repeatability ±50 ms
Applicable
standards
Conforming standards EN 60947-5-1
Installation environment (pollution level 2, installation category III)
EMC EN 60947-5-1
Safety standards UL 508 (Recognition), Korean Radio Waves Act (Act 10564),
CSA: C22.2 No.14, CCC: GB/T 14048.5
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
10 sweeps of 5 min each in X,Y, and Z directions
Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes
Degree of protection Terminals: IP20