"time delayed circuit breaker"

Old 01-21-03, 11:55 AM
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"time delayed circuit breaker"

Explain the differance between a normal breaker and a time delayed?

40 amp double oven circuit.
Old 01-21-03, 12:07 PM
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They used to make breakers for motors differently I believe,, dont quote me here,, and I think all new breakers are built like this to some extent, but, for your oven just a common breaker is all you need. Special breakers would be for hi surge starting of motors.
Old 01-21-03, 12:40 PM
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The two types of breaker are inverse time and instantaneous. The instantaneous are also called magnetic. They trip on the slightest overload instantly. Inverse time breakers trip based on the amount of overload. I do not have the UL numbers handy, but as an example: the breaker might take 10 minutes to trip at 110%, but trip in 1 second at 200%, and in 10 milliseconds at 500%. I cannot recall ever seeing an instantaneous trip for home use. The regular breaker for your panel will be an inverse time, and that is what the oven people want. The reason is that the resistance of the heating elements is lower when they are cold. They will draw more power. When they heat up, the resistance increases, and the power falls to the normal operating value.

Last edited by brickeyee; 01-21-03 at 01:44 PM.
Old 01-21-03, 12:49 PM
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Thanks for the info, I had them and did not know it.

Now to find/make room for another 220 breaker.

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