The Hager NBN450 is a circuit breaker with a rated operational voltage of 230/400 VAC, a nominal current of 50A, 4 poles, a DIN rail mount, and a B character. It is designed to protect electrical circuits from abnormal conditions, such as short-circuiting, overload, and ground faults. It has a thermal-magnetic release that initiates based on current, temperature, or voltage ensuring that the circuit is protected from these potential hazards. This breaker has a high breaking capacity and is ideal for industrial and commercial applications.