Greetings! I have a question regarding circuit breaker voltage rating. Can I use a 5SL 240/415V breaker with a 120V application? 

Best regards. 

Hello,

You have published post in wrong conference, it should have been in Low-Voltage Power Distribution and Installation Technology product conference.

BTW you may use 5SL mcb at 125 volt. Its important to check short circuit breaking capacity & which characteristic type mcb is required in application. Search on Google to find out how to calculate short circuit capacity & types of charachteristics of MCB.

HTH