Phase Control Relay FKV-11 | TENSE

The FKV-11 phase control relay is designed to protect three-phase equipment from major power grid disturbances - in particular, against phase failure (phase loss), phase sequence errors, and phase asymmetry. The relays ensure the safe operation of electric motors, pumps, compressors, and other three-phase equipment.

The model has a fixed 30% asymmetry and is designed for single DIN rail mounting.

FKV-11 Relay Operation (Operating Algorithm)

Normal Operation

• All three phase voltages are present.

• Phases are connected in the correct sequence.

• Voltage is within the permissible range.

• Contacts 2-3 are switched, LED OUT → output is active.

Asymmetry or Voltage Deviation

• If the voltage of one phase changes by more than 30% or if the sum of multidirectional value changes exceeds this limit:

  • the ASM LED (asymmetry indicator) lights up,

  • contacts 2-3 disconnect,

  • contacts 1-2 close,

  • the OUT indicator turns off.

Return to Normal Mode

• If the voltage returns to the permissible range,

• the relay will re-activate the output, and contacts will switch back to 2-3 closed contacts.

Main Features and Benefits

• Protection against:

  • Phase failure,

  • incorrect phase sequence,

  • phase asymmetry (fixed 30%).

• Visual status indication with LEDs (OUT / ASM).

• Fast response to power grid faults.

• Compact design - only 22.5 mm wide.

• Easy mounting on DIN rail.

Technical Parameters

Dimensions

• Length: 85 mm

• Height: 77.6 mm

• Width: 22.5 mm