Shunt Ttip Breaker Diagram
- Thread starter trainorsr
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Trainor,
Generally we don't permit threads that do not contain specific information or questions. I'm assuming from your post that you're looking for info on shunt trip devices. Please post a specific question(s) so that someone can give you the proper answer. As of right now we're merely guessing.
Welcome to the forum.
Generally we don't permit threads that do not contain specific information or questions. I'm assuming from your post that you're looking for info on shunt trip devices. Please post a specific question(s) so that someone can give you the proper answer. As of right now we're merely guessing.
Welcome to the forum.
mdshunk
Senior Member
- Location
- Right here.
--------------- L1
--------------- L2
Pretty nice diagram, eh? That's all there is to it. Put whatever voltage into the shunt trip leads that the kit calls for, and the breaker snaps off. Nuttin' to it.
--------------- L2
Pretty nice diagram, eh? That's all there is to it. Put whatever voltage into the shunt trip leads that the kit calls for, and the breaker snaps off. Nuttin' to it.
Buck Parrish
Senior Member
- Location
- NC & IN
Maybe it's three phase:grin:
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
It also can be a maintained or momentary contact to activate it.
mdshunk
Senior Member
- Location
- Right here.
A maintained contact will burn up some shunt trip coils. I'm not sure how you know what kind will tolerate it and what kind won't (lacking docs), so I generally try to arrange for a one-shot signal.hillbilly1 said:
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Never had that problem, pretty hard to one shot a Ansul contact. I think most shunt trips have continous rated coils or use clearing contacts.
zog
Senior Member
- Location
- Charlotte, NC
trainorsr said:
I have literally thousands of breaker wiring diagrams, none of which will be any good to you unless you give more details, and even then it may not, depending on what your question is.
- Location
- Massachusetts
zog said:
I will bet you that Marc's diagram and advice nails it. :smile:
- Location
- Massachusetts
To us building electricians a shunt trip is pretty much like this.
http://www.cbs.state.or.us/bcd/programs/elevator/interps/shunt_trip_wiring.pdf
Nothing fancy.
In this case it is elevator shutdown other times it will be kitchen equipment shutdown. A typical molded case circuit breaker with just two wires dangling out of it that will open the breaker when powered.
http://www.cbs.state.or.us/bcd/programs/elevator/interps/shunt_trip_wiring.pdf
Nothing fancy.
In this case it is elevator shutdown other times it will be kitchen equipment shutdown. A typical molded case circuit breaker with just two wires dangling out of it that will open the breaker when powered.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
In simple terms, a shunt-trip breaker is a breaker that can be tripped by remote control. There is a coil inside the breaker that will trip the breaker upon either energization or de-energization, depending on the model and purpose.
A couple of years ago, we had to replace the 225a, 3p main breaker for one panel in a switch-gear stack. This panel supplied everything under the hood for the fire-suppression system. It made it simple to wire the system.
In many cases, the circuit that trips the shunt-trip is supplied by that same breaker, so it automatically loses power right after it trips. Sometimes, the tripping power comes from a circuit that does not immediately lose power.
The problem is that the coil, which is often designed to run on anything from 120v to 480v, is designed for a momentary coil voltage. Maintained power will quickly overheat and destroy the coil. Then you have an ordinary breaker.
An auxillary contact is often installed in the breaker for this exact purpose. Because most fire-suppression systems maintain tripping voltage once the system is tripped, the auxillary contacts must be used to protect the coil.
The one I had to replace burned out because someone had pushed an emergency button who-knows-when. I found the auxillary contact wires still coiled up neatly on the rear of the breaker. :roll: It was that way since the place was built.
Hope this was helpful.
A couple of years ago, we had to replace the 225a, 3p main breaker for one panel in a switch-gear stack. This panel supplied everything under the hood for the fire-suppression system. It made it simple to wire the system.
In many cases, the circuit that trips the shunt-trip is supplied by that same breaker, so it automatically loses power right after it trips. Sometimes, the tripping power comes from a circuit that does not immediately lose power.
The problem is that the coil, which is often designed to run on anything from 120v to 480v, is designed for a momentary coil voltage. Maintained power will quickly overheat and destroy the coil. Then you have an ordinary breaker.
An auxillary contact is often installed in the breaker for this exact purpose. Because most fire-suppression systems maintain tripping voltage once the system is tripped, the auxillary contacts must be used to protect the coil.
The one I had to replace burned out because someone had pushed an emergency button who-knows-when. I found the auxillary contact wires still coiled up neatly on the rear of the breaker. :roll: It was that way since the place was built.
Hope this was helpful.
zog
Senior Member
- Location
- Charlotte, NC
iwire said:
A wiring diagram refers to the remote trips (All of them) , closing coil power, charhging motor, TOC's. MOC's, and other devices connetions to the power source via the secondary contacts, every breaker I deal with has a wiring diagram, eithe rfactory spec or customer suppiled.
- Location
- Massachusetts
zog said:
I am willing to bet not one of the items in that list are present in the OPs situation. You are thinking of a much more sophisticated installation then I believe we have here.
We would have a standard thermal magnetic breaker with a shunt trip mechanism, a set of NO contacts and a power source that is generally from the load side of the breaker in question.
mdshunk
Senior Member
- Location
- Right here.
Of course they do. I was providing a ridiculously simple answer to make fun of the OP and make him realize how ridiculously he worded his question. If he wanted a diagram of all the possible control circuits, that's what he should have asked for.zog said:
- Location
- Massachusetts
This is along the lines I was picturing.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
In my case, it looked like this:
My experience with Westinghouse and Eaton Cutler Hammer for 18 years the only breaker that requited a cut-off switch wired in series with the shunt trip coil was the classified high-shock navy circuit breaker. The shunt trip was installed in one pole of the breaker and the cutoff switch was installed in the opposite pole. The cut off switch had to be intentionally wired in series with the shunt trip coil.
Otherwise every shunt trip had a cut off switch integrally wired in series with the shunt trip coil which automatically cut of power to the coil when the breaker opened.
There was no need to consider a momentary switch to activate the shunt trip.
One thing that will fry a shunt trip coil is to try to energize it with a voltage source that is not high enough to active the solenoid. That will let the smoke out.
I?ve installed accessories in breakers from 150 to 2500a frames.
Otherwise every shunt trip had a cut off switch integrally wired in series with the shunt trip coil which automatically cut of power to the coil when the breaker opened.
There was no need to consider a momentary switch to activate the shunt trip.
One thing that will fry a shunt trip coil is to try to energize it with a voltage source that is not high enough to active the solenoid. That will let the smoke out.
I?ve installed accessories in breakers from 150 to 2500a frames.
zog
Senior Member
- Location
- Charlotte, NC
mdshunk said:
I know you were, I thought it was pretty funny.
zog
Senior Member
- Location
- Charlotte, NC
iwire said:
Why would someone need a wiring diagram for that?, in my world wiring diagrams for breakers are an everyday request, thats why I assumed he was looking for something like that.
- Location
- Massachusetts
zog said:
Because they have never seen this type of breaker before? A residential electrician would never seen a shunt trip breaker.
I know when I first saw one I had to ask what the deal was. Here is breaker with no information on it with just two leads hanging off it.
Immediate questions would be do I just have to close this pair or do I have to power this pair?
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