Phase control relay FKV-11 | TENSE

The FKV-11 phase control relay protects three-phase devices against the most common faults in the power grid – in particular , phase reversal , phase failure , and phase imbalance . The relay ensures the reliable operation of electric motors, pumps, compressors, and other three-phase devices.

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

Functioning of the FKV-11 relay (operating algorithm)

Normal operation

• All three phase voltages are present.

• The phases are connected in the correct order.

• The voltage is within the permissible range.

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

Asymmetry or voltage deviation

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

  • The ASM LED (asymmetry indicator) lights up,

  • Contacts 2-3 switch off,

  • Contacts 1-2 are switched on,

  • The LED OUT goes out.

Return to normal

• When the voltage returns to the permissible range,

• The relay switches the output back on and contacts 2-3 close again.

Key features and benefits

• Protection against:

  • Phase failure

  • incorrect phase sequence

  • Phase asymmetry (fixed 30%).

• Visual status indicator via LED (OUT / ASM).

• Fast response to network errors.

• 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