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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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High price of 600 amp circuit breakers?
"Ignoramus5533" wrote in message ... I came into possession of a few used 400-600A circuit breakers. Each is the size of a milk jug. While researching prices on them and such (they sell for $150-200 on ebay), I learned that some cost many thousands of dollars new. I saw numbers from $2,500 and higher. I am curious just what makes them so expensive. Do they have any precious materials inside? Or what? i Bigger frame breakers have always cost a lot more. Larger frame breakers are can be made to withstand larger fault currents. Interrupt larger current at higher voltages. I used to work for an OEM and we had some circuit breakers that were well over $25000.00 (SPB series) "rebuilt". New more like $40k. I have installed some medium voltage vacuum breakers that were well over $100k each. Unfortunately they are just so much boat anchor material unless you have a need for one of them. They are not interchangeable. There is a thriving market in rebuilding, testing and installing such equipment. |
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High price of 600 amp circuit breakers?
"Ignoramus5533" wrote in message ... On Mon, 24 Oct 2005 12:05:31 -0700, SQLit wrote: "Ignoramus5533" wrote in message ... I came into possession of a few used 400-600A circuit breakers. Each is the size of a milk jug. While researching prices on them and such (they sell for $150-200 on ebay), I learned that some cost many thousands of dollars new. I saw numbers from $2,500 and higher. I am curious just what makes them so expensive. Do they have any precious materials inside? Or what? i Bigger frame breakers have always cost a lot more. Larger frame breakers are can be made to withstand larger fault currents. Interrupt larger current at higher voltages. I used to work for an OEM and we had some circuit breakers that were well over $25000.00 (SPB series) "rebuilt". New more like $40k. I would understand that, for vacuum units. I have installed some medium voltage vacuum breakers that were well over $100k each. Unfortunately they are just so much boat anchor material unless you have a need for one of them. They are not interchangeable. There is a thriving market in rebuilding, testing and installing such equipment. I am not sure about interchangeability. My 400-600 A breakers (Siemens, ITE, Westinghouse etc) simply take 3 wires in and 3 wires going out. They do not mount on special connector panels, like residential breakers. i Those sound like the "universal or OEM" mounts. Almost everyone makes those in some form. |
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High price of 600 amp circuit breakers?
"Ignoramus5533" wrote in message ... On Mon, 24 Oct 2005 14:45:29 -0700, SQLit wrote: "Ignoramus5533" wrote in message ... On Mon, 24 Oct 2005 12:05:31 -0700, SQLit wrote: "Ignoramus5533" wrote in message ... I came into possession of a few used 400-600A circuit breakers. Each is the size of a milk jug. While researching prices on them and such (they sell for $150-200 on ebay), I learned that some cost many thousands of dollars new. I saw numbers from $2,500 and higher. I am curious just what makes them so expensive. Do they have any precious materials inside? Or what? i Bigger frame breakers have always cost a lot more. Larger frame breakers are can be made to withstand larger fault currents. Interrupt larger current at higher voltages. I used to work for an OEM and we had some circuit breakers that were well over $25000.00 (SPB series) "rebuilt". New more like $40k. I would understand that, for vacuum units. I have installed some medium voltage vacuum breakers that were well over $100k each. Unfortunately they are just so much boat anchor material unless you have a need for one of them. They are not interchangeable. There is a thriving market in rebuilding, testing and installing such equipment. I am not sure about interchangeability. My 400-600 A breakers (Siemens, ITE, Westinghouse etc) simply take 3 wires in and 3 wires going out. They do not mount on special connector panels, like residential breakers. i Those sound like the "universal or OEM" mounts. Almost everyone makes those in some form. Yes, that's right. I could screw them to any metal sheet, it seems. I will double check tonight, they are still in my pickup. i Please check the mounts before mounting on a grounded surface. Some of these breakers have to be put on glastic so the terminals will not arc. |
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