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Trips circuit breaker - Heating & Cooling

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Something is either shorted or grounded. Check your compressor and fan motor(s) with an ohm meter to ground and across the terminals. If you get continuity to ground, the part is grounded. If you have no measurable resistance across the terminals, the part is shorted out.

Posted on Aug 01, 2009

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What voltage and amperage is required to trip a shunt trip unit


The circuit breaker will have a shunt trip voltage & current ratings, a variable current selector knob, etc. - based on the type breaker (Catelog number). Here is a link to images of C-H shunt trip devices and circuit breakers
cutler hammer shunt trip circuit breakers parts Google Search If you can provide the catelog or model number - I 'll be able to provide add'l help.

Mar 11, 2014 | Eaton Electrical Supplies

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Circuit Breaker Keeps Tripping


Your circuit breaker keeps tripping and you are wondering why it would do that. There actually can be many things that can cause a circuit breaker to trip, or shut off. I will give you some reasons why circuit breakers trip and also some circuit breaker troubleshooting tips.

The first thing to remember about a circuit breaker is that they are first and foremost a safety device. The protection provided by the circuit breaker is also two fold. The circuit breaker will protect against overcurrent, or in other words, it will keep you from melting down the wires by placing too high of a load on any circuit. This would cause the wires to overheat and start a fire.

The other way a circuit breaker protects you is that the circuit breaker senses very quickly if there is current flowing to the ground with out it going through a load. This means that there is a shock hazard or a fire hazard. The circuit breaker will interrupt the current and shut off to prevent damage from happening.

If your circuit breaker is tripping off then you need to find out why this is happening. By eliminating the load on the circuit you can start to narrow down the possibilities. If there are a number of things plugged into the circuit then unplug something till it will stay on.If you can get the load low enough so that the circuit breaker stays on then you are okay and just need to spread the load out over a couple of circuits to prevent the overloading.

If you cannot stop the circuit breaker from tripping, unplug loads until you narrow the problem down to one thing. Once you narrow it down to one thing that is tripping the circuit breaker then you can find out why the load is tripping the circuit breaker.

Now if the load that is still plugged in is an appliance like a washing machine, then you need to find out if the cause of the tripping is the motor or if it is something like a wire that is rubbed through and is shorting out. If it is the motor the circuit breaker will often trip right when the motor goes to start up.

If the circuit breaker trips immediately when power is applied then you probably have a bad wire or connection. Poor connections are common in appliances such as an oven or a dryer where high amounts of current can be pulled at one time and the heat will make the connection get hot and eventually fail.

There are so many different possibilities for circuit breakers tripping that it is impossible to cover them all. There is one tool that will make the detective work of finding a short or problem much easier.This tool is called an "OHM" meter. One of these can be purchased at most any hardware or electrical store. Many big box stores and even a Wal-Mart also have them. There are many very inexpensive models available.

By using an OHM meter you can check the resistance of a circuit. The idea is that if a circuit has NO resistance to ground then it is bad and the electric can flow to the ground unhindered. This is a dangerous situation and must be corrected. In motors the flow of current between phases with no resistance, is also a reason why a circuit breaker will trip.

Above all remember that you need to verify and make sure that all electric is shut off to any piece of equipment that you are working on. Isolating and finding electrical problems can be very time consuming and frustrating. It will take time and patience to methodically eliminate the possible causes of a circuit breaker that keeps on tripping or a circuit breaker that will not reset. Through careful checking you can one by one eliminate the possibilities and find the cause of your circuit breaker not staying on.

on Oct 03, 2010 | Hammering

1 Answer

Chainsaw trips circuit breaker


Does the circuit breaker trip before squeezing the switch? Check the power cord - there's a short

Does the chain move freely before squeezing the switch? If not, and the circuit breaker trips while squeezing the switch, your chain is too tight.

Bottom line - tell us when the breaker trips and what you were doing when it tripped.

Dec 07, 2012 | Craftsman 16" Electric Chainsaw Chain Saw...

1 Answer

Breaker installed on generator. Keeps tripping under no load after approx. 1 minute of generator running


A tripping circuit breaker is an indication of an overload. You say there is no load on the breaker - how are you making this determination? Are you using an amprobe or some other meter?

A circuit breaker with NO load shouldn't ever trip. Likewise a circuit breaker carrying up to 80% of of the current it is rated for shouldn't trip either. Circuit breakers that carry more than 80% of their load will trip - if the load remains connected long enough. This is called "duty factor" or "service factor" The greater the load is in excess of 80%, the less time that the breaker will carry it before tripping.

An example of a 100 amp breaker with different loads on it (this 100 amp value was chosen for ease of doing the math):

80 amps - never trips
85 amps - trips after 48 hours
90 amps - trips after 16 hours
95 amps - trips after 8 hours
100 amps - trips after 4 hours
105 amps - trips after a few minutes
120 amps - trips after a few seconds
150 amps - trips instantly

This is only an example to show how a certain circuit breaker might trip under a load less than the rating stamped on the body or handle.

A circuit breaker that trips with no load or a load equal to or less than 80% of its rating is most likely defective. You need an amprobe or ammeter for amp readings. If the load is found to be 80% or less, there may be an issue of harmonics that is causing the tripping. You'll need to have special equipment and qualified persons to check harmonic problems. Most harmonic problems occur when the loads are not linear device (transformers). Examples of non-linear devices are "switching" (or solid state) power supplies like those in computers.

I hope this helps and good luck. Please rate my reply. Thank you.

Apr 07, 2011 | GE Tjk436f000 3pole 400a 600vac Circuit...

1 Answer

LD3600WV MAIN CIRCUIT BREAKER


I'm not sure what your question is - since all you did was put in a model number of a circuit breaker.

If you need to reset this circuit breaker: 1) Slide the handle to the OFF position. 2) Slide all the other breakers in the panel to the OFF position. 3) Stand to the side (not directly in front of the panel) 4) Slide the handle of the main breaker to the ON position. if it trips, there is a majot fault that should be addressed by a qualified person (electrician).

If the main breaker does not move to the TRIP or OFF position: 1) One by one, starting with the double wide / large value circuit breakers, slide the handles to ON. 2) Any breaker that goes to TRIPPED or OFF should be attempted to be reset ONCE. If it trips again, an electrician should be called, and the breaker left in the TRIPPED or OFF position. 3) One by one, return the handles of the remaining circuit breakers to ON.

If you're looking for different information - please provide as much detail as you can. Include the breaker panel manufacturer's name and model - and the circuit breaker data.

Mar 09, 2011 | Cutler Hammer "WESTINGHOUSE" MAIN DOUBLE...

1 Answer

I have a square D breaker with shunt trip. The breaker keeps tripping so how do I check the breaker?


A shunt trip breaker operation.

It works just like a normal circuit breaker with one additional function. A shunt-trip breaker also has a built-in magnetic coil that can be energized externally to trip the breaker.


So what is wired to the shunt that is not letting the breaker reset?


Read more: http://wiki.answers.com/Q/How_does_a_shunt_trip_breaker_work#ixzz1EXNCP5r0

Feb 20, 2011 | Square D Qob120 Circuit Breaker With Shunt...

2 Answers

The Lights circuit breaker keeps trips without load


try a new breaker, they do wear out over time

Feb 08, 2010 | Electrical Supplies

2 Answers

Siemens Main Breaker 125 Amp gets warm and trips


sounds like a loose connection ,or possibly a weak main breaker.

Jul 14, 2009 | Siemens /ITE 100Amp 2-pole molded circuit...

1 Answer

Two 15 amp arc fault breakers installed on two adjacent circuits. One works fine - does not trip. The afi breaker beside it trips as soon as it is flipped on. We tried switching circuits, but both circuits...


It's possible that the first breaker that you said does not trip - it could be that breaker is failing to trip on a bad circuit. That is, it could be you have a bad circuit but that first breaker is not detecting it and pretends everything is OK. If your new breaker trips on the first breaker's circuit, the curcuit it probably bad and the breaker in not working properly. The most common problem for failed circuits is a stray ground wire in a box somewhere in the curcuit resting against a hot or neutral wire. You'll have to take apart every connection on that curcuit to find it. Not fun.

Jun 14, 2009 | Siemens 20Amp 1-pole arc-fault circuit...

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