EARTH-FAULT indicator

The earth-fault indicator type TERRA can be used in radial medium voltage networks with one input and open-ring networks. The network has to be solidly earthed or low resistance-earthed. The indication of the earth-fault is done by a flag indicator. The connection between the earth-fault sensor and the display unit is done by cable. The sensor must be mounted on screened cables. The sensor is divisible and can be retrofitted on the cable. For the operation of the display device an auxiliary power supply is needed. Due to the bistable flag indication the power supply can fail after the occurrence of a fault.

The earth-fault indicator type TERRA consists of:

– One display unit for displaying the earth-fault
– One sensor type SE for detecting the earth-fault

Order Data
Type TERRA | panel-mounted 26.20.10
Type TERRA | surface-mounted 26.30.10

Features and Benefits

Five trip currents between 20 A and 160 A
- Optional: One fixed trip current
Flag indication
Optional: Button to test the function of the display unit
Reset function:
– Optional: Manual by push button
– Optional: by recovering auxiliary power supply
Power supply: 115 / 230 V AC, can fail during fault situation
Surface-mounted and panel-mounted housing
Optional: Blinking unit type BL4.2 for outdoor indication


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