Residual-current circuit-breaker

Residual-current protection module

The residual-current protection modules can be connected to the bottom of the circuit-breaker NZM1 and NZM2 (on the NZM1 on the right) with the same contour design.
This device combination fulfils the following tasks:
– conduct and switch current up to 250 A
– protection with overload, short-circuit and fault current.
A compact and mounting-friendly solution!

Alternatively the modules can be combined with switch-disconnectors N. An external auxiliary voltage is not required. The residual-current protection module of the NZM2 is independent of the mains voltage and can thus be used for personnel protection in Germany.

You can select between pulse current sensitive and AC/DC sensitive devices. There are 3 and 4-pole devices featuring different rated fault currents available for almost every mains constellation: from 30 mA to time-discriminating 3 A.

In the event of a fault the residual-current-operated circuit-breaker on the NZM1 will initially indicate the rising fault current via an LED. Only when the adjusted fault current is exceeded will the residual-current release of the circuit-breaker trip. This means: the main contacts are opened. The cause of the trip is indicated mechanically on the NZM1 and 2.

Optional auxiliary contacts can be clipped on in order to remotely indicate the trip. The circuit-breaker and the residual-current release must be reset and switched back on in order to restore the power supply.

PFR Residual Current Relay with Ring-Type Transducer –
Flexible fault current protection up to 1800 A current rating

Compact, safe, adaptable...

... just as it should be, the fault current protection which is particularly suited for cramped spaces such as for example in service distribution systems.

Ring-type transducers which are arranged in a space saving manner on the cabling run and the measuring relay which is simply snapped onto the DIN mounting rail, combine to form a functional unit.

The new Moeller relay/transducer combination covers operating currents in a range from 1 to 1800 A. The wide spectrum of applications ranges from general power distribution tasks to individual motor controls.

The fault currents which are detected and processed by the relay range from 30 mA to 5 A.

Residual Current Relay with Ring-Type Transducer

Fault current relay		Ring-type transducer

The adjustable relay provides a pre-warn function which alerts before the set fault current is exceeded. The pre-warning allows preventative action to be taken to prevent shutdown of the electrical energy.