Shunt Ttip Breaker Diagram

[Dennis Alwon]

I was providing a ridiculously simple answer to make fun of the OP and make him realize how ridiculously he worded his question.

I don't think this is the best approach esp. to a first time poster.

 

[mdshunk]

I don't think this is the best approach esp. to a first time poster.

I draw the line where a reasonable man would, and don't really consider the sensitivities of the most sensitive person.

 

[Dennis Alwon]

I draw the line where a reasonable man would, and don't really consider the sensitivities of the most sensitive person.

You should try it, you might like it--Mikey did. :grin:

 

[templdl]

I do realize that often times one does not have a clue as to what is inside a breaker and what makes it work. I have had them apart, installed standard and electronic trip units, shunt trips, flux transfer shunt trips, alarm contacts, 1a-1b and 2a-2b auxiliary switches, and undervoltage releases. I've even taken them apart in order to understand what makes them work.

Simply stated all that needs to be done to trip a breakers with a shunt trip if rated to be applied with 120ac is to do just that, energize the 2 leads or termination points with 120vac momentarily or continuously with 120vac and the breaker will trip, the cut-off switch in the breaker will automatically disconnect power from the shunt trip coil for you.

 

[LarryFine]

. . . the cut-off switch in the breaker will automatically disconnect power from the shunt trip coil for you.

Yes, if it's wired into the circuit properly. Some have no contacts, and some have separate contacts that must be intentionally wired in.

If the breaker powers its own supply, no contacts are necessary. These contacts are sometimes used to trigger external warning systems, also.

 

[templdl]

While working for one of the leading manufacturers of molded case circuit breakers as a sale engineer primarily selling breakers to OEMs for 18 years and as a breaker application engineer for 4 years there wasn?t a single industrial/commercial breaker that need to have an external cut-off switch. All industrial/commercial breaker shunt trips had an integral cut-off switch.
That's not to say that there may be other manufacturers out there as will as off brands where you need the external cut-off switch. But I do know that the Eaton/Cutler-Hammer breakers do not and I highly doubt if the Square-D breakers need external cut-off switches either.

 

[LarryFine]

Not external contacts, but optional ones. Some have SPDT contacts, and some have DPDT.

The ones I've seen had a pair of wires for the coil, and three separate wires for the contacts.

 

[peter d]

You should try it, you might like it--Mikey did. :grin:

Marc is actually a robot who is incapable of feeling or emotion, remember?

 

[peter d]

I draw the line where a reasonable man would, and don't really consider the sensitivities of the most sensitive person.

I think Marc needs a hug again.