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Look at label of marking on breaker box.
Square D would have D with a square.
Take one of the individual circuit breakers to local box store and see which brand breaker matches.
Or take circuit breaker to electric supply house and see who sells that main.
Not all mains are available.
And if main was getting hot, it might have damaged the busbar so whole panel needs to be replaced.

Posted on Oct 28, 2012


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Main breaker trips but no other break does

the individual breaker may be burnt on the inside creating a direct line to the main breaker. you may have to remove each individual breaker until you find one that doesn't trip the main breaker.

Feb 25, 2015 | Electrical Supplies

1 Answer

Main breaker can't be stitched back on after neighborhood power outage in our home, yet all the neighbors have power except us! Why are we the only ones without power?

You're trying to load the entire house on the main breaker all at once. There significantly less stress on the main breaker if you start it like this:

1) Shut off all the circuit breakers.
2) Turn on the main circuit breaker.
3) Turn the other circuit breakers on, one at a time.

Good luck!

May 06, 2012 | Electrical Supplies

1 Answer

I have a 125 FPE box currently the combined total of all breakers presently in the box is 190 amps. I am wanting to replace a single pole 20 with a single pole 40. Am I already maxed out or do I have room...

You can add the breaker.
The key is total electric use.
As long as total consumption does not exceed amps shown on main breaker, then the new 40A breaker installation is ok.
If total consumption exceeds main breaker, then the main breaker will start to get hot and then trip.

Put hand on main breaker and feel for warmth.
The main should not feel warm.
Consider upgrading to 150A or 200A service.

Aug 22, 2011 | Connecticut Electric UBIF040N FPE...

1 Answer

My question is on the main 100 amp breaker it has one slot on each side of the breaker .so one hot wire goes on the right side and one goes on the left side ? its a little confusing because usually both...

A main breaker accepts two inputs which are 180 degrees out of phase. If this is in the US, then each phase is approx 110V relative to ground (or neutral) and the the two phases are approx 220V relative to each other. There are two hot bus-bars in the panel, running vertically one for each phase of the main breaker. If you look at how these bus bars are connected to the branch breakers, you will see that every-other breaker slot in the panel is connected to one phase or the other. So if you have a 220V branch breaker, say for the stove, this is really two breakers together, one for each phase. These 220V branch breakers do have output lugs right next to each other. The main breaker is similar in that it is also two breakers connected together. But because the main breaker is mounted at the top and is as wide (or nearly as wide) as both sets of branch breakers (down the left and down the right) it is generally more convenient to wire the inputs to the left and right side of this main breaker. But the location of the input lugs to the main breaker is arbitrary. There may be some models where the inputs are adjacent to each other. If you have any doubt, do a continuity test on the main breaker (while it is NOT installed) to confirm that that each input lug is connected only to one output clamp (that is, where it connects to it's bus-bar.) I hope this helps, please vote if it did. Good luck, Al K

Jul 20, 2011 | Siemens 100 Amp Main Breaker Renovation...

2 Answers

200 amp breaker is melting and power is flickering in house

Usually this is a defective breaker, possibly caused by water intrusion into the panel. This is NOT a do it yourselfer job -- refer this to a professional who knows what they're doing. The meter base needs to be pulled to cut the power to repair it and you are dealing with power that has virtually no fuse or breaker protecting it. If that sounds dangerous, there's a good reason -- it is. I get unnerved doing these. I hope I've helped you, though maybe not the answer you were hoping for.

Feb 14, 2011 | Cutler Hammer "WESTINGHOUSE" MAIN DOUBLE...

1 Answer

My 200 amp braeker(main is tripped and wont reset. What should the incoming voltage be???

Don't mess with main breaker if you're not qualified.
Wires on main breaker are Hot even when main is turned off.
The only way to turn off main is to pull meter.

1) There are 2 Hot wires that connect to main breaker.
Each wire is 120Volts, and each 120V line is 'out of phase' with the other.
Two out of phase 120V lines create 240Volt circuit when they are wired together.
Read more on links below.

2) It sounds like your main breaker needs to be replaced, unless total of all circuits exceeds 160 amp. Turn off small circuit breakers and try main breaker again. If main resets, then turn small circuits back on one by one. Your main may still be bad.

3) Here are more links that explain electric wiring.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on breaker or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 21, 2011 | Cutler Hammer 200 Amp Circuit Breaker...

1 Answer

The two breakers opposite the main do not work. What's the problem?

You haven't indicated the part number for your panel, but I'm assuming that since you say the inoperable breakers are "opposite" the main, that you have the type of panel where the main is at the top of one side of the panel. If this is the case, usually the opposite spaces have no place on the buss for breakers to attach. In that case these are not spaces for breakers. The panel legend on the door usually will indicate thes, but sometimes the cover is the same for a main lug or a main breaker panel.

Sep 19, 2010 | Cutler Hammer 100 Amp Main Breaker...

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...

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