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

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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.
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1 Answer

HOW TO WIRE


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

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1 Answer

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