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What is the difference between 120/240 V and 240 V rated QO breakers?

When to use a 120/240V and a 240V QO Circuit Breaker?
Product Line:
Miniature Circuit Breakers
QO and QOB Circuit Breakers
A 120/240 V breaker can only be applied on a system where the maximum voltage from any conductor to ground does not exceed 120V. A 240 V breaker can be applied on a delta system where the voltage to ground is 208 V, or where the transformer is not grounded.

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