voltage monitoring relay / phase sequence / phase unbalance / panel-mount
KSP34x series

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voltage monitoring relay voltage monitoring relay - KSP34x series


  • Measured/monitored value:

    voltage, phase sequence, phase unbalance

  • Other characteristics:


  • Trigger voltage:

    Max.: 460 V

    Min.: 100 V


Correct Phase Sequence
Reversed Phase Sequence
Supply Line Voltage Imbalance
Loss of a Supply Phase Voltage
KSP34E2 protects and safeguards personnel and equipment against injury and damage due to reversed rotation, and is a must for ship’s shore connection, mobile installations and non-permanent installations. KSP34E2 is to be connected to the supply line voltages.

The KSP34E2 is a moving iron voltmeter incorporating a phase sequence and phase failure trip relay. The voltmeter can be connected permanently to any one line voltage or via a selector switch to measure all three line voltages.

LEDs indicate if the phase sequence (direction of rotation) is CORRECT (green LED lit) or REVERSED (red LED lit). A lit red LED may also indicate SUPPLY FAILURE (caused by major voltage imbalance or loss of a supply phase voltage). The trip relay can be used for alarm purposes or to control automatic phase sequence correction relays.

KSP34E2 is insensitive to regenerative power loads, and is designed to function with both loaded and unloaded motors, regenerative four-quadrant drive systems etc. The unit does not respond to voltage imbalance within the specified line voltage range.

The unit meets IEC60092-504 and the relevant environmental and EMC tests specified in IEC60068/60092 and IEC61000/60533 respectively, to comply with the requirements of the major Classification Societies.