I Need a 400V, 3-pole, 25A circuit breaker.....what would you use?

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As the title states. I need a 400V 3-pole circuit breaker. The 3-pole breakers at my local big box stores are rated at 240V. What would you use?

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Reply:480v.breaker from electrical supply store?Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Amazon has plenty of offerings. Most common for the 3 pole are the type that mount on a dinse rail. The one I picked up for my rotary phase converter was rated for ,400 or 480 volt although I didn't need that high of a voltage rating.
Reply:If you using 240 volt then I use a 240 breaker add label 240 volts.In America you can find 480 volt but cost is high.Dave

Originally Posted by Oscar

As the title states. I need a 400V 3-pole circuit breaker. The 3-pole breakers at my local big box stores are rated at 240V. What would you use?
Reply:

Originally Posted by jpump5

480v.breaker from electrical supply store?
Reply:I don’t know what the NEC has to say about thisbut a 40amp. 240v. breaker on the primary sideof the transformer would trip when the secondary side reaches about 23.5 amps.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Some line-load options. Mount one in old disconnect box.https://www.ebay.com/itm/30403427835...c767cc0280324chttps://www.ebay.com/itm/12227809980...440b817146cf7eSame as above but has wrong picture of item,https://www.simplybreakers.com/products/cqd325Or go with a fusible disconnect,https://www.homedepot.com/p/Siemens-...F361/205858167Last edited by danielplace; 19 Hours Ago at 08:37 AM.
Reply:Have you specified what it goes in? Is this a single circuit application? As in a disconnect for a machine? 400 volt three pole is foreign to me. Nominally 480 Volt is very common.No mater where you buy 480 Volt equipment it costs a good deal more than 240 V. There are used, and refurbished sellers.An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.
Reply:

Originally Posted by Willie B

Have you specified what it goes in? Is this a single circuit application? As in a disconnect for a machine? 400 volt three pole is foreign to me. Nominally 480 Volt is very common.No mater where you buy 480 Volt equipment it costs a good deal more than 240 V. There are used, and refurbished sellers.
Reply:Ahhh.... I was thinking he'd bought an even bigger grinder...250 amp Miller DialArc AC/DC StickF-225 amp Forney AC Stick230 amp Sears AC StickLincoln 180C MIGVictor Medalist 350 O/ACut 50 PlasmaLes
Reply:I would avoid used aka refurbished. If some gave me breaker I do refurbishing my self. In America 400 volt is not used .The 6 voltages that command in America [120, 208, 240, 277, 480 and 575 volts]. But breakers come in 120/240 277/480 and 600 volts. Single phase is lowest cost , Then three phase 480 volt more triple price. Dave

Originally Posted by Willie B

Have you specified what it goes in? Is this a single circuit application? As in a disconnect for a machine? 400 volt three pole is foreign to me. Nominally 480 Volt is very common.No mater where you buy 480 Volt equipment it costs a good deal more than 240 V. There are used, and refurbished sellers.
Reply:Even this route $150https://www.homedepot.com/p/Siemens-...F361/205858167https://www.ebay.com/itm/22442664475...0f2b08805d6317
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Originally Posted by smithdoor

I would avoid used aka refurbished. If some gave me breaker I do refurbishing my self. In America 400 volt is not used .The 6 voltages that command in America [120, 208, 240, 277, 480 and 575 volts]. But breakers come in 120/240 277/480 and 600 volts. Single phase is lowest cost , Then three phase 480 volt more triple price. Dave
Reply:Looks great 👍. It what like using.You use 240volt 3 phase but Oscar want higher cost 480 3 phase witch is ok. Dave

Originally Posted by danielplace

Even this route $150https://www.homedepot.com/p/Siemens-...F361/205858167https://www.ebay.com/itm/22442664475...0f2b08805d6317
Reply:

Originally Posted by smithdoor

Looks great ��. It what like using.You use 240volt 3 phase but Oscar want higher cost 480 3 phase witch is ok. Dave
Reply:Yes, I realize one rated at exactly 400V might be rare, but obviously so long as the voltage rating is that high, then it would/should work.  I've gotten some good responses thus far, together with the not-so-good-responses that always accompany my electrical threads,


Originally Posted by danielplace

I imagine he is looking for protection between transformer and welder. Stand alone line/load style.https://weldingweb.com/vbb/threads/7...ng-transformerOscar likes electrical wizardry no doubt about that. Say what ? We don't have that many phases. We will make it. Say what ? We don't have that voltage. We will make it.
Reply:"I want unusual stuff nobody ever heard of. It has to be cheap." A bit of a challenge, wouldn't you concede?An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.
Reply:So, someone recommended some breakers from Automation Direct, 480V 25A 3-pole C-curve trip curve 35mm DIN Rail Mount, that look like I could make them work.Amperage aside, Any reason I could not use those 480V 3-pole breakers at 400V and 240V (3-ph of course)?  What I know tells me the lower operating voltage (compared to the breaker voltage rating) should have no ill-effects, so long as they are sized properly to protect the wiring, etc.  Thoughts?

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Reply:https://www.zoro.com/siemens-iec-sup...57/i/G6145264/Mike
Reply:

Originally Posted by Oscar

So, someone recommended some breakers from Automation Direct, 480V 25A 3-pole C-curve trip curve 35mm DIN Rail Mount, that look like I could make them work.Amperage aside, Any reason I could not use those 480V 3-pole breakers at 400V and 240V (3-ph of course)?  What I know tells me the lower operating voltage (compared to the breaker voltage rating) should have no ill-effects, so long as they are sized properly to protect the wiring, etc.  Thoughts?
Reply:I've never done it because of cost. In my world, a 240 volt 3 pole 25 amp breaker might cost $100. In 480 volt it might be $800.If I understand your application, are you talking about 400V single phase? Would you need a 2 pole breaker for that?An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.
Reply:

Originally Posted by Willie B

"I want unusual stuff nobody ever heard of. It has to be cheap." A bit of a challenge, wouldn't you concede?