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Measuring & Monitoring Relay Selection Guide

Motor Protective Relays

Application	Product name	Appearance	Model	Functions
Overcurrent, open phase, reverse phase	Motor Protective Relay		K2CM	Motor protection	Overload, open phase, reverse phase	Inverse operation
			K2CM-Q			Instantaneous operation with start-up lock
			SE-K, -KP	Motor protection	Overload, open phase, reverse phase	Inverse operation
			SE-KQ			Instantaneous operation with start-up lock
			SE-K, -KP	Transformer protection		Inverse operation (Set the imbalance factor L to 65%.)
Overcurrent	Current Sensor		SAO-R	Motor overcurrent protection	Inverse operation
			SAO-Q		Instantaneous operation with start-up lock
			SAO-S		Instantaneous operation
			SAO-RS	Single-phase motor overcurrent protection	Inverse operation
			SAO-QS		Instantaneous operation with start-up lock
			SAO-SS		Instantaneous operation
Reverse phase	Reverse Protection Relay		APR-S	Three-phase motor reverse operation
Undercurrent	Current Sensor		SAO-SU	Motor / heater burnout protection	Instantaneous operation
Heater burnout	Heater Element Burnout Detector		K2CU-F	Large-capacity (4 to 80 A AC) with built-in current transformer
			K2CU-P	Small-capacity (0.5 to 4A AC) compact, plug-in type
Voltage	Voltage Sensor		SDV-FL	Single-function type	DC overvoltage/ undervoltage detection, polar detection input
			SDV-FM, -FH	Single-function type	AC/DC overvoltage / undervoltage detection
			SDV-DM, -DH	Double-function type
			SDV-FH[]T	Single-function type	AC/DC overvoltage, undervoltage detection, equipped with timing function
			LG2-AB	AC voltage detection (adjustable operate and release values)
			LG2-DB	DC voltage detection (adjustable operate and release values)
Ground faults	Ground Fault Relay		K6EL	Detection of ground faults due to insulation deterioration
			K6EL-R	Operates at 50 mA ±10%, conforms to standards, economical

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K8AB Series Measuring and Monitoring Relays:

By Selection Chart

 

What type of monitoring relay is required?

Single-phase control

Three-phase control

Current

Voltage

Voltage

What type of control is required?

Over /under

Over /under

Window

Sequence / phase-loss

Multi-function

Sequence / phase-loss / asymmetry

Window

K8AB-AS

K8AB-VS

K8AB-VW

K8AB-PH

K8AB-PM

K8AB-PA

K8AB-PW

* For more product information, please refer to K8AB Series Measuring & Monitoring Relays.

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By Selection Table

 

Specifications                                                                        Model			K8AB-AS	K8AB-VS	K8AB-VW	K8AB-PH	K8AB-PM	K8AB-PA	K8AB-PW	K8AB-TH
1-phase power supply	Over or under current (switchable)		•
	Over or under voltage (switchable)			•
	Over and under voltage (window comparator)				•
3-phase power supply	3-phase power supply with 3 wires	Phase sequence				•	•	•
		Phase loss				•	•	•
	3-phase power supply with 3 or 4 wires (switchable)	Phase sequence					•	•
		Phase loss					•	•
		Asymmetry						•
		Over and under voltage (window comparator)					•		•
Output relays	On SPDT relay		•	•		•		•		•
	Two SPDT relays				•		•		•
Operation	Operation level setting		•	•	•		•	•	•	•
	Operation time setting		•	•	•		•	•	•
	Individual upper / lower limit settings (individual outputs)				•		•		•
	Function selection (DIP switch)		•	•	•		•	•	•	•
	Pre-alarm warning mode				•
Indications	Power indicator/ operating status indicator		•	•	•	•	•	•	•	•
	Trip warning indicator (flashing alarm indicator)		•	•	•		•	•	•
Safety standards	CE (CE mark compliance certified by third party)		•	•	•	•	•	•	•	•
	UL		UL certification pending

* For more product information, please refer to K8AB Series Measuring & Monitoring Relays.

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