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Short-circuit indicator
Type MF

The short-circuit indicator type MF can be used in radial networks with one input and open-ring networks. The indication of the short-circuit is done by one LED 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 should not fail in case of a fault.

The short-circuit indicator type MF consists of:

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

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

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

Order Data Article no.
Type MF-L | panel-mounted 25.20.10
Type MF-L | surface-mounted 25.25.20
Type MF-S | panel-mounted 25.30.10
Type MF-S | surface-mounted 25.35.20

Features and Benefits

Type MF-L: Seven trip currents, see sensor type LK
Type MF-S: Five trip currents between 200 A and 1000 A
Four response delays between 40 ms and 300 ms
LED indication
Passage of 2nd short-circuit by double blinking
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 3.6V
– Optional: 12-110V DC
– Optional: 115 / 230V AC
Contacts for remote monitoring
Permanent or wipe contact type can be selected on site
Surface-mounted version:
Two on site configurable relays by DIP switch
Optional: third relay for remote indication of empty battery
Surface-mounted and panel-mounted housing available
Optional blinking unit type BL4.1 for outdoor indication


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