Question about Siemens #MP120GF 20A SP GFI Breaker

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Heat generated in a Siemens GFI breaker

A client is concerned that his Seimens GFI breakers were getting hot. I looked up your arc flash breakers and they do heat up because of the electronics, Does the GFI breaker have similar characteristics.


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No, the heating would be due to the load applied to it

Posted on Mar 05, 2009

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My 3 arc fault breakers run hot and draw about a third of an amp from the ground bar wire each, 24/7. Is this possibly normal?

How did check amps. I would check the amps on the circuit itself. Might be drawing close to max. thats why it's hotter. breaker should have no more than 80%. Of an amp draw on the circuit

Oct 05, 2016 | Eaton ARC FAULT CIRC BREAKER

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Why are these breakers hot and constantly draw .35 amps from the ground bar?

When current is going through wiring and devices it normally operates warm. That is why most wire and devices such as breakers are rated at 70 degrees Celsius. In a panel, heat can be transferred through the buss bar they are connected to.
Breakers will trip for 2 reasons. Overload amperage and heat.

Oct 05, 2016 | Eaton ARC FAULT CIRC BREAKER

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I have a siemens 40-200 panel. There are 7 knob & tube circuits still in the house that aren't accessible to rewire. Been told that GFI breakers connected to these circuits will pass code. any

Yeah, as long as you run your GFI's on the same circuit then you would probably be good. I say "probably" because I do not know your local codes, but for places I know it would be. Hope I could help.

Sep 17, 2012 | Siemens 20Amp 1-pole arc-fault circuit...

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A single pole ground fault breaker has a screw terminal on one side for the black wire to the ciorcuit, a white curly pigtail that goes to the panel neutral/ground bar, and a screw terminal near the white wire for the white neutral wire from the circuit.

A 2 pole GFI breaker is similar, But it has another screw terminal for the other hot wire in the circuit.
For a 220 volt, 2 pole, GFI protected circuit, you need to run a 4 wire cable. black, red, white, green.

Please Vote !!

Apr 13, 2010 | Siemens 50 Amp Ground Fault Circuit...

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We have a wet location with a need for a 3 pole 30 amp Siemens BL circuit breaker to feed the peice of equipment and would like to have ground fault protection. Is this Breaker available in GFI?

I see you're looking for a 3 pole 30 amp Siemens BL cir. brkr.? I don't believe they make a this type of breaker in a 3 pole. In a 2 pole yes, but not a 3 pole. Also, I see on top of your message, it says Siemens #MP120GF 20 amp SP GFI Breaker. Now, if this is what you're looking for, I do know they have one. If you're working out of a home, I'm sure you have a 240 volt service, and a 3 pole wouldn't work here anyway. I'm just checking, but do feel free to contact me for this, or any other questions you may have. Good Luck to you, and I hope I was able to help you in some way. - Jim

Mar 31, 2010 | Siemens #MP120GF 20A SP GFI Breaker

1 Answer

GFI 'shorted'

load neutral connects to the neutral binding screw on the GFI, do NOT connect the load neutral to the neutral bar.

Mar 05, 2009 | Spa Parts Plus GFCI, Circuit Breaker, 30...

1 Answer

3 combination arc fault breakers tripping under load

What is happening is the white wire that comes off the breaker is probably too close to another neutral or too close to a hot wire that is on one of the other circuits that will make it trip when you use a drill etc... Check to see if the coiled up white wire off of the breaker is not near a hot in the panel. I have had lots of arc fault breakers trip for that reason.

Nov 25, 2008 | Siemens 20Amp 1-pole arc-fault circuit...

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