UL recognizes 600V as the highest voltage rating for molded-case circuit breakers used on DC systems.
This rating applies specifically to molded-case circuit breakers, which are common in industrial and commercial DC applications, as established by Underwriters Laboratories (UL) standards. Higher voltages, such as those up to 1200V seen in some DC miniature circuit breakers, may exist but lack explicit UL recognition in the referenced contexts. Always verify specific UL listings (e.g., UL 1066) for exact compliance in installations.
