Short-circuit indicator
Type K / KM / KH

The short-circuit indicators type K, KM and KH are designed to detect faults in medium voltage networks with a radial or open-ring topology with one input. The short-circuit indicators apply a current threshold to identify faults. The fault is indicated via a bistable flag indication with a signal red colour.

The indicators are single, self-contained units which do not need any power supply. Therefore no battery maintenance is required. The devices are available with different steel frames or steel belts so that the devices can be mounted on different cables and busbars. All steel frames and steel belts are divisible so that the indicators can be easily retrofitted in existing installations.

The short-circuit indicator type K is available in three versions:

The three versions differ in the method used to reset to standby mode after a fault is detected.

Type K: Automatic reset by recovering operating voltage. The indicator must be installed on unscreened cables.
Type KH: Manual reset with a button. The indicator can be mounted on screened and unscreened cables.
Type KM: Automatic reset by recovering operating voltage and manual reset. If the automatic reset shall be used, the indicator must be installed on unscreened cables.

Features and Benefits

One trip current available between 150 A and 1500 A

Flag indication

Reset function
– Type K: automatic
– Type KH: manual
– Type KM: automatic and manual

No power supply required

Very robust and strong

Completely casted and sealed (IP67)