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Short-circuit indicator
Type OK

The short-circuit indicator type OK can be used in radial networks with one input and open-ring networks. The indication of the short-circuit is done by one flag for each phase. The sensors are divisible and can be retrofitted on the cable. The display device is powered by an exchangeable lithium battery. Alternatively the display device can be connected to an auxiliary power supply that may fail in case of a fault.

The short-circuit indicator type OK consists of:

– One display unit for displaying short-circuits
– Three sensors type LK or SK (page 17) for detecting short-circuits

The short-circuit indicator type OK is available in two versions:

Version OK-L: The connection between the sensors and the display unit is potential-free and is done by fibre optic cables. The sensors can be mounted on screened and unscreened cables.
Version OK-S: The connection between the sensors and the display unit is done by cable. The sensors must be mounted on screened cables.

Order Data Article no.
Type OK-L | panel-mounted 19.20.10
Type OK-S | panel-mounted 19.30.10

Features and Benefits

Type OK-L: Seven trip currents, see sensor type LK
Type OK-S: Five trip currents between 200 A and 1000 A
Four response delays between 40 ms and 300 ms
Flag indication
Button to test the function of the display unit
Reset function:
– Manual by push button
– Time: four values between 1 h and 12 h
- Remote reset contacts
– Optional: by recovering auxiliary power supply
Power supply:
– Lithium battery type AA 3.6 V
– Optional: 12-110V DC
– Optional: 115 / 230V AC
Contacts for remote monitoring
Permanent or wipe contact type can be selected on site
Optional: blinking lamp type BL4.1 / BL6 for outdoor indication


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