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Anonymous Poster #1

MCCB Positions

04/20/2022 12:35 AM

If the Shunt trip coil gets energized in a MCCB, whether it goes to "Trip" position or "OFF" position?
If the UV coil gets energized in a MCCB, whether it goes to "Trip" position or "OFF" position?

Opening release, shunt trip coil, Under voltage release - can all these three components be arranged in a MCCB together? or only two of these three components be put in a MCCB

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#1

Re: MCCB Positions

04/20/2022 5:51 AM

Here is a link that explains all 3 of your questions very clearly,if you take the time to read it,you will learn a lot.Took about 1 minute to Google it...probably less time than it took you to pose the question to this forum.

https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/circuit-breakers/power-defense-insulated-case-circuit-breaker/il0131087en-instructions-for-undervoltage-release-shunt-trip-an.pdf

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#5
In reply to #1

Re: MCCB Positions

04/24/2022 4:40 PM

This is for Power Circuit Breakers, the OP asked about MCCBs. PCBs have a lot more options and conditions than the typical MCCB.

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Anonymous Poster #2
#2

Re: MCCB Positions

04/20/2022 7:21 AM
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#3

Re: MCCB Positions

04/21/2022 3:24 AM

Sure all three can be setup but a better method is to use a dedicated controller to operate the shunt trip.

I have worked with CET3 and CET4 motor protection relays where the output trips a shunt trip. The relays can protect for under voltage, overcurrent, phase loss, earth fault, locked rotor.

Here is a link to Sprecher+Schuh protection relays, you will find all the answers here. https://www.sprecherschuh.com/b2b.SprecherSchuh/library/index.php

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#4

Re: MCCB Positions

04/24/2022 4:37 PM

There is no universally true answer for all makes and models of MCCB. Most modern versions generally will allow both a shunt and under voltage trip coil to be installed IF there is room in the “accessory pockets”. Larger breakers have multiple sockets allowing for this, but smaller frames may have only one pocket. Older MCCB designs had room for only one in the back of the case, so you had to choose which one you wanted and the trip could could only be added by the factory on initial order.

In every one I have used, both devices act upon the “trip bar” inside, the same thing that the thermal and magnetic trip sensors act upon. So when you shunt or UV could release the breaker, it goes to the “Tripped” position and must be reset.

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