Indication LEDs

Overload Indication LED

Red LED indicates the phase or phases with overrun
Overload LED: indicates that the long-time current setting Ir has been overrun

Current Indication LEDs

Current indication LEDs on the front of the trip unit continuously display the currents measured on phases 1, 2 and 3 as a percentage of the long-time current setting Ir.

Trip Cause Indication LEDs

The indications of the four trip cause LEDs depend on the type of MicroLogic trip unit.

LED	Description
	MicroLogic 2.0 A/E, 5.0 A/E, 6.0 A/E, 7.0 A: Trip due to long-time protection
	MicroLogic 2.0 A/E: Trip due to instantaneous protection MicroLogic 5.0 A/E, 6.0 A/E, 7.0 A: Trip due to short-time protection or instantaneous protection
	MicroLogic 2.0 A/E, 5.0 A/E: Not applicable MicroLogic 6.0 A/E: Trip due to ground-fault protection MicroLogic 7.0 A: Trip due to earth-leakage protection
	MicroLogic 2.0 A/E, 5.0 A/E, 6.0 A/E, 7.0 A: Trip due to auto-protection. The auto-protection function (excessive temperature or short-circuit higher than circuit-breaker capacity) opens the circuit breaker and turns on the Ap LED. NOTE: If the circuit breaker remains closed and the Ap LED remains on, contact your field service representative.

When activated, a LED remains ON until it is locally reset.

NOTE:

A number of simultaneous causes may result in tripping. The LED signalling the last trip cause chronologically is the only one to remain ON.
The battery maintains the trip cause indications. If there are no indications, check the battery.

Resetting Trip Cause Indications

Determine why the circuit breaker tripped. The trip cause indication is maintained until it is reset on the trip unit.
Press to reset the trip cause indication LED.

For more information about the procedure for resetting and closing the circuit breaker after a trip, refer to DOCA0221EN ComPacT NS - Circuit Breakers and Switch-Disconnectors - User Guide.