Question about Siemens /ITE 100Amp 2-pole molded circuit breaker

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Siemens Main Breaker 125 Amp gets warm and trips

After upgrading circuit breaker panel 4 months ago:

- The new Siemens Main Breaker 125 Amp gets warm and trips ocassionally (for the past 6 weeks).

- But all the other house circuit breakers Do Not trip.

- Outside meter box checked by electrical company: no problems.

How come only the Main Breaker is tripping?

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  • Anonymous Mar 16, 2014

    I am trying to install a new breaker in the main panel

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Check amp draw, make sure service calculation was completed correctly, check line side and load side connection of main breaker

Posted on Dec 07, 2015

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

Posted on Jul 15, 2009

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Crouse - Hines Murry Style MP or MD 200 Amp Main Breaker Difficult to Reset


A 200 amp circuit breaker has a large spring to assist in rapid opening and closing a load of this size to minimize damaging arcing every time is it operated under electrical load

The larger the circuit breaker is and the more poles (1, 2 or 3) that are being opened / closed; the more force it will require to operate - both by hand or when tripping. Compare the tension or force you need to apply to a similar sized circuit breaker at Home Depot, etc.

The troubling issue about this for me is the fact that the 200 amp service disconnect / main is tripping. This is an indication of an overloaded panel / circuit. I usually see individual circuits that trip in a panel - but often find the that main breaker has only 20% - 60% of its rating on it at any given time. If you're tripping a 200 amp service disconnect / main breaker repeatedly - something has got to give - and eventually the circuit breaker will fail. That may be where you are now with this breaker. You may be in need of a service upgrade (if it is the service disconnect) as clearly, you have out grown the 200 amp size one you currently have or need add a new sub-panel to ease the load that this 200 amp main is trying to supply now.

Either way, you should call a reputable electrical contractor to have your service / sub-panel evaluated very soon. Good luck!

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Gould 200 amp main breaker gets hot


Branch loads that are fed by the Main are pulling the amperage to make the breaker warm. Breaker should trip if over 125% of rating

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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.
http://waterheatertimer.org/How-to-install-a-subpanel.html

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

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A 60 Amp breaker (three phase) powers an 125 amp main lug 3 phase panel is that k or do i need a bigger braker. the wires are #8 THHN.


The breaker that feeds the panel and the wire are what determines the rating. The panel has to be at least as high as the breaker. It can be more, and no problem.The problem I see is that the wiring is undersized for the 60 amp breaker. You should have #6 wires or change the breaker to a 50 amp. If that is not enough for your load, you must change the wiring. It also depends on the type of wire. THHN will have the largest amperage, but if it is TW, it will be lower. Rule of thumb would be #10-30 amp, #8-40-50 amp, #6-50-60 amp, #4-70-90 amp and #2-95-135 amp. There are other factors, such as derating etc. but if you wanted to increase to 100 amp, I would run #2 thhn. Hope this helps.

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There was no grond bus installed


You can buy ground busbar at home center or electric supply and install in main box.
Or go back to seller and swap out for new box that is complete.

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How do I run from a 100 amp main panel to a 60 amp subpanel, 125 from my house to the garage


See 60 Amp sub-panel image

Above image shows drawing of 60Amp sub-panel located next to main panel. Drawing shows #6 wire... 125' distance to garage calls for #4 wire. I ran #4 to my barn and have no problems.

Give thought to how many new breakers you want at garage.
See photo of subpanel that holds three 240V breakers

Using drawing as a guide. Replace existing 240Volt breaker with new 60 Amp breaker. Two hot wires connect to new 60 Amp breaker. Neutral connects to neutral busbar.

More space: You can free up space in main breaker box using a tandem breaker. Or by doubling up 2 lightly used 120V circuits onto one breaker. Do not double-up on 240 Breakers

Conduit: You want PVC conduit large enough to fit three #4 wires. Bigger conduit is easier to pull wires ... and maybe later ethernet wire, or alarm wire etc.

Ground wire: You can put a ground rod at garage and run #6 bare copper between sub-panel neutral-busbar and ground rod. Attach ground wire firmly with grounding clamp.

I want you to check with local electrical supply for exact code in your area concerning conduit requirements, grounding, and wire size. Tighten all lugs very tight against wire.

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About 2 months ago my Main Breaker in my 100 amp service box began tripping when certain large appliances were running the same time my central air unit was running. Nothing has changed as far as...


Well breakers can weaken overtime if they are overloaded. A breaker is meant to have 80% of its capacity used, for example a 20 amp breaker should have only 16 amps of current on it. If something was changed six years ago that has loaded that breaker to its max it may have not affected it until now. Another thing would to be absolutely sure that everything running in your house is not exceeding 100 amps. Many houses these days have 200 amp panels because of how much amperage added appliance and the like will use. A licensed electrician will be needed to swap out the breaker, which will be a little expensive but shouldn't be outrageous as he will not be swapping out the whole panel, just the main breaker.

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15 amp Gould breaker trips every 24 to 48 hours


As seemingly with everything else, these devices were once very reliable but now fail early in life.
Assuming that this is no GFI (Ground Fault Interrupter) equipped breaker, you must  have a bad one. If it is, you may have some stray currents tripping the breaker.
While finishing up on our new home and putting breakers in the main box for the first time, one brand new breaker refused to stay set even though the circuit was OK and no loads on that branch connected at all. In the two years we have been here, we had to replace a second one acting just as you describe.

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Electrical - Air Conditioning


Ben, you are on the right track. To upgrade the breaker, first look at the main house breaker panel and determine if allowing more current through main breaker will be taxing it too highly (will 20 more amps exceed my main breaker limit...what is the main breaker current trip at?) Then look at the wire size leading away from the 40 amp breaker to outside. If it is 6 gage copper or 4 gage copper-clad aluminum wire, you are ok to upgrade. Any smaller wire size could be unhealthy.

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