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Sizing circuit breaker for single phase load

Sizing circuit breaker for single phase load

Sizing circuit breaker for single phase load

(OP)
Hi All,

How do I size a three phase circuit breaker for single phase loads?

RE: Sizing circuit breaker for single phase load

Not sure what exactly you are asking.

You can view a 3-phase breaker as group of three (3) single phase breakers. For example, a 30A 3-pole breaker consists of three 30A single phase breakers operating in tandem. So each "pole" of of a 3 phase breaker is a single phase breaker. Since only one pole will be serving the single phase load, the size (ampere rating) of a 3 phase breaker will remain the same as that of a single phase breaker.

This is not to condone the use of a 3 phase breaker for a isolated single phase load.

If this does not help, you need to clairfy your question further.



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