Can I Use Shunt Release in MCCB

Ideally, the topic forms the basis of a telephone discussion with the equipment manufacturer.

What is this "telephone" device you speak of?

The Phone Call Is Dead

Ask Schneider, as based on your previous question you don't appear to be electrically qualified to specify or work on a 250A Distribution MCCB.

Don't forget to get someone electrically qualified to install it for you.

The Shunt Trip (Release) Coil function is to allow mechanical tripping/opening of a Molded Case Circuit Breaker by a remote device other than by the overload & short-circuit mechanism already built into the breaker. (Usually thermally activated)

In many cases the Shunt Trip function is used for Ground Fault protection of the equipment being supplied by the breaker however it can be used to trip/open the breaker for any reason. (Equipment Protection Interlock Permissives, Equipment Safety Permissives, Low Voltage & Over Voltage Protection, Buss Transfer Interlock, and many other reasons as dictated by the application needs.)

Adding a Shunt Trip to a MCCB is a bit tricky and you would be much wiser to purchase a new MCCB that has the shunt trip already included.

Be sure to specify the correct coil voltage rating and the correct auxillary contact configuration needed for your application.

As already stated:

You appear to be lacking in experience and it would be wise for you to contact the selected breaker manufacturer technical support before specifying and/or ordering the breaker and/or shunt trip kit.

If you decide to install a shunt trip kit using in-house personnel:

It is extremely critical to equipment and personnel safety that you test the breaker after assembly following the breaker OEM test procedure to verify correct operation.

This requires a calibrated breaker tester that you can purchase or rent.

Failure to follow this testing can lead to catastrophic equipment failure and/or extreme injury to personnel.

Thanks Mr. SHOCKHISCAN, this is really useful to me.

There are several devices that can be used to remotely control a circuit breaker:

Shunt trip device: This device trips or opens the circuit breaker when a voltage is applied to its coil.

Under voltage release device: This device trips or opens the circuit breaker wne a voltage is removed from the its coil. Typically one would select this approach over a shunt trip when there is a need for the circuit to be fail safe.

Remote reset device: With some circuit breakers, one can get a device with motors which can reset the circuit breaker from a remote location.

The reasons one would elect to use such devices are varied. But it starts with a need to turn something off in a hurry. This can be done through monitoring with various devices that connect direct to the circuit breaker, through control logic, or through a switch for an operator to activate.