Shunt trip Breaker
- Thread starter lorddrago
- Start date
- Status
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
lorddrago said:
A couple of things come to mind.
1. Is there any chance that the control circuit for the shunt trip is being activating when the power goes off?
2. Is there any chance the breaker has a low voltage trip on it instead of what you think is a shunt trip?
brian john
Senior Member
- Location
- Leesburg, VA
I'd bet on the undervoltage release, is the CB warm when closed but with no load? Is there measurable voltage on the CB's shunt wires when closed?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Are you sure that it trips when the power goes out or when it comes back on?
cschmid
Senior Member
- Location
- Northern cold country
why would you need a shunt trip in a church?? the only dumb question is the one never asked..
brian john
Senior Member
- Location
- Leesburg, VA
Let me tell you about the churches I have been working in lately, full TV studios, recording studios, cafeterias, day cares, schools. Seating 2,400 plus.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
brian john said:
Those wouldn't be around here. Many churches that were here 15 years ago are no longer in existence.
cschmid
Senior Member
- Location
- Northern cold country
brian john said:
Nothing like that here and then I could see why..
electricalperson
Senior Member
- Location
- massachusetts
cschmid said:
some places might require a shunt trip breaker to cut the power to certain areas when the fire alarm goes off. ive seen this in a venue in providence
electricalperson
Senior Member
- Location
- massachusetts
the fire alarm panel could be fed from a fused dissconnect that comes off of the loadside of the service before it goes to the panel with the shunt trip breaker. so that the only thing with power when the alarm goes off is the FACP
Lorddrago, Don't happen to be in TN, do you ?
I was asked to check out the same situation in a church for a S.T. on an outlet under a hood system. In investigating, I discoverd everytime you turned power off and on to the hood the added S.T. breaker tripped.
As it worked out, there was a "relay race" going on in the hood/ansul system.
The S.T. activated quicker than the realy picked up on the ansul system.
I was asked to check out the same situation in a church for a S.T. on an outlet under a hood system. In investigating, I discoverd everytime you turned power off and on to the hood the added S.T. breaker tripped.
As it worked out, there was a "relay race" going on in the hood/ansul system.
The S.T. activated quicker than the realy picked up on the ansul system.
eager2learn
Senior Member
- Location
- Mennifee,Ca
can someone explain to me how a shunt trip breaker works aswell as the termonology for shunt. i've been working on gear lately and would like to be able to understand how exactly they work - so if asked i know
mdshunk
Senior Member
- Location
- Right here.
A shunt trip breaker just has a little solenoid inside that, when it receives power, will trip the breaker. The breaker basically has a set of #14 pigtails hanging out of the side of it, or sometimes two little terminals. There are a variety of reasons to use a shunt trip breaker. EPO's (emergency power off) buttons are often wired into a shunt trip main breaker to dump a whole panel, like in a school wood shop, gas station, or computer room. They are also often used by the fire alarm system to dump an elevator breaker. The shunt trip accessory can be field installed in breakers adaptable for their use, but often the breaker is ordered with it factory installed. When you open up some breakers, you can end up with a lap full of clockworks. The actual breaker itself is a normal breaker, but just with a shunt trip feature.eager2learn said:
quogueelectric
Senior Member
- Location
- new york
my best guess
my best guess
Is that the person who installed the ansul system probably installed a relay because they did not understand how to correctly install the ansul shunt trip and when the power goes out the relay drops and powers the breaker off before the entire power is tripped. Only the ansul system should trip not the entire service. However sometimes church jobs are favors so they use whatever is laying around the shop to try to keep the cost down.
my best guess
Is that the person who installed the ansul system probably installed a relay because they did not understand how to correctly install the ansul shunt trip and when the power goes out the relay drops and powers the breaker off before the entire power is tripped. Only the ansul system should trip not the entire service. However sometimes church jobs are favors so they use whatever is laying around the shop to try to keep the cost down.
Budhi.Rahardjo
Member
Shunt Trip breaker
Shunt Trip breaker
Dear All,
I Think this is just oponion that shunt trip normally function as under voltage release component which will open the breaker while the voltage is under the voltage system with +- 5 % setting point.It will caome back when the voltage getiing its normal mode .I think in this case you should check its mechanism function if it is not normal any more.
Regards,
Budhi Rahardjo
Shunt Trip breaker
Dear All,
I Think this is just oponion that shunt trip normally function as under voltage release component which will open the breaker while the voltage is under the voltage system with +- 5 % setting point.It will caome back when the voltage getiing its normal mode .I think in this case you should check its mechanism function if it is not normal any more.
Regards,
Budhi Rahardjo
- Status