Operating the Circuit Breaker

Circuit Breaker Operating Control Accessories

The following table shows the operating control accessories compatible with the ComPact NSX circuit breakers. For more information, refer to LVPED217032EN ComPact NSX & NSXm Catalogue.

Operating control accessory	NSX100			NSX160			NSX250		NSX400	NSX630
Operating control accessory	1P	2P	3P/4P	1P	2P	3P/4P	1P	3P/4P	3P/4P	3P/4P
Toggle handle	✔	✔	✔	✔	✔	✔	✔	✔	✔	✔
Rotary handle	–	–	✔	–	–	✔	–	✔	✔	✔
Motor mechanism	–	–	✔	–	–	✔	–	✔	✔	✔
Communicating motor mechanism	–	–	✔	–	–	✔	–	✔	✔	✔

Handle Position

The handle position indicates the state of the circuit breaker:

Toggle handle	Rotary handle	Motor mechanism

I (ON): Circuit breaker closed. Closed manually. O (OFF): Circuit breaker open. Opened manually. Trip: Circuit breaker tripped. Tripped by the protection (trip unit or trip auxiliaries), the push-to-trip button, or the USB maintenance interface.		I (ON): Circuit breaker closed (in Auto or Manu mode). O (OFF): Circuit breaker open or tripped (in Auto or Manu mode).

Load Indication

Circuit breakers equipped with a MicroLogic trip unit provide precise information of the state of the circuit breaker or the installation. This information can be used for the management and maintenance of the installation.

For example, if the pre-alarm or alarm indicator is lit, performing load shedding may prevent tripping due to circuit breaker overload.

A The Ready LED (green) blinks slowly when the electronic trip unit is ready to provide protection.

B The overload pre-alarm LED (orange) shows a steady light when the load exceeds 90% of the Ir setting.

C The overload alarm LED (red) shows a steady light when the load exceeds 105% of the Ir setting.

Remote Indication

Information is available remotely:

From the indication contacts
From the wireless indication auxiliaries
By using a communication network

These indication auxiliaries can be installed on site.

For more information about the remote indication and communication options, refer to the summary tables of auxiliaries and to DOCA0141EN, ComPact NSXMicroLogic 5/6/7 Electronic Trip Units - User Guide.

Remote Electrical Stop Command

The remote electrical stop command can be given by electrical control auxiliaries regardless of the control type in use.

To obtain a remote electrical stop command, use:

An MX shunt trip release, or
An MN undervoltage trip release, or
An MN undervoltage trip release with time-delay unit (the time-delay unit overcomes the problem of micro-cuts).

For more information about the electrical control auxiliaries, refer to the relevant topic.

NOTE: It is advisable to test operation of the remote electrical stop commands at regular intervals (every six months).