Circuit breaker. Optimum product quality, tested reliability and safety stand for best protection of personnel, installations and plant. Eaton's FAZ-NA DIN rail mountable circuit breaker is designed for use in branch service applications. Complete range of UL 489 listed DIN rail mounted miniature circuit breakers up to 40 A current rating. Standard ratings of 10 kAIC up to 277/480 VAC. Current limiting design provides fast short-circuit interruption that reduces the let-through energy, which can damage the circuit. Suitable for branch circuit device protection. Thermal-magnetic overcurrent protection. Three levels of short-circuit protection, categorized by B, C and D curves. Trip-free design breaker cannot be defeated by holding the handle in the ON position.