QOB 3 pole gfi breaker

K

KWH

Senior Member
Has anyone run into a situation in a commercial kitchen with a circuit that is 3pole 4 wire but the breaker doesn't have a neutral screw, so what do you need to do other than hardwire if possible.
 
I don't think Square D makes a 60A,3P GFI breaker. I thought those only went up to 50A,3P to match NEMA configuration receptacles. I have had trouble finding GFI circuit breakers to protect 3-phase IEC receptacles with ratings that exceed 50A.

Do you have the right breaker?
 
The only one I found was with this company, and they don’t show a picture or schematic of it.
www.circuitbreakerwholesale.com

Square D QOB360GFI

Catalog Number: QOB360GFI Manufacturer: Square D Connection: Bolt-on Frame Type: QOB Amperage: 60 Poles: 3 Voltage: 120/240 Square D QOB360GFI Details:
www.circuitbreakerwholesale.com www.circuitbreakerwholesale.com
 
Square D has a product selector tool on their website that lets you figure out what their standard offerings are for standard products. I don't see a 60A, 3P GFI breaker available.

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LarryFine said:
"
Yes, we offer QO/QOB- GFI 3 pole breakers in amperages of 15, 20, 30, 40, and 50.
NOTE that this breaker does NOT have provision for a load neutral conductor and is for use on 208Y/120 VAC systems.
For 240VAC use EPD/EPE breakers. (30ma ground fault protection)"
Click to expand...
Not permitted for any application where the NEC required GFCI protection.
 
I do not get why there are no bigger 3ph gfcis with neutral, even in the external standalone type. Those are readily available up to 100A but none with a neutral over 30A. Also, why so expensive? A box mounted 30A 3ph 4 wire gfci should be MAYBE $200. Not the $600-1100 they sell for. Hopefully companies are working on expanding their offerings.
 
Todd0x1 said:
I do not get why there are no bigger 3ph gfcis with neutral, even in the external standalone type.
Click to expand...
Where in a 3 phase device will you be using the Neutral on a branch circuit?

To explain; the Neutral in a GFCI serves two purposes; to power the electronics inside of the breaker, and to monitor Neutral current on SINGLE PHASE loads, so that you have something to compare the line current flow against. Square D makes their GFCIs so that they power themselves from Line to Line, so they don't need the Neutral for that purpose. Then in a 3 phase branch circuit, there would be no need to monitor the Neutral to compare current flow, because if any line is going to ground, you can simply compare to either of the other two lines. This same issue by the way is true for Square D 2 pole GFCIs as well (if the load device is not using the Neutral), although most people just connect the Neutral anyway out of habit.
 
Jraef said:
Where in a 3 phase device will you be using the Neutral on a branch circuit?

To explain; the Neutral in a GFCI serves two purposes; to power the electronics inside of the breaker, and to monitor Neutral current on SINGLE PHASE loads, so that you have something to compare the line current flow against. Square D makes their GFCIs so that they power themselves from Line to Line, so they don't need the Neutral for that purpose. Then in a 3 phase branch circuit, there would be no need to monitor the Neutral to compare current flow, because if any line is going to ground, you can simply compare to either of the other two lines. This same issue by the way is true for Square D 2 pole GFCIs as well (if the load device is not using the Neutral), although most people just connect the Neutral anyway out of habit.
Click to expand...

>Where in a 3 phase device will you be using the Neutral on a branch circuit?

For example a 4P5W receptacle (think L21-30, etc) in a location where GFCI protection is required.
 
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