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Earth-fault indicator

The earth-fault indicator type EASI can be used in radial networks with one input and open-ring networks which are solidly earthed or low resistance-earthed. The special feature of the EASI is the indication of an earth-fault by one LED indicator and optionally one additional flag indicator (EASI-ER / EASI-R version). The additional flag increases daytime visibility. 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. The display device is powered by an exchangeable lithium battery. Alternatively the display device can be connected to an auxiliary power supply.

The earth-fault indication provides two indication modes by LED:

Single blink per second: There has been an earth-fault current, but it is not present any more.

Double blink per second: The earth-fault current is still present or there is an asymmetrical current in the network.

The indicator is available in two versions:

– Type EASI-E / EASI-A with LED indication
– Type EASI-ER / EASI-R with LED and flag indication

The earth-fault indicator type EASI consists of:

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

Order Data Article no.
Type EASI | panel-mounted 21.30.10
Type EASI | surface-mounted 21.20.10
Type EASI-ER | panel-mounted 21.50.10
Type EASI-R | surface-mounted 21.40.10

Features and Benefits

Five trip currents between 10 A and 160 A
Four response delays between 40 ms and 300 ms
LED and flag indication
Indication of permanent earth-faults by double blinking
Button to test the function of the display unit
Reset function:
– Manual
– Time: 1 / 2 / 4 / 8 h
– Optional: by recovering operating current
– Optional: by recovering auxiliary power supply
Power supply:
– lithium battery type AA 3.6 V
– or 12-110 V DC
– or 115/230 V AC
Contacts for remote monitoring (NO + NC)
Permanent or wipe contact type can be selected on-site
Surface-mounted and panel-mounted housing
Optional blinking unit type BL4.1 for outdoor indication


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