The NBN540 electronic part with Circuit breaker manufactured by Hager is a 1+N pole with a rated voltage of 230/400VAC and rated current of 40A. It is designed to be installed on a standard DIN rail and its characteristics classified as Class B. This electronic part offers a wide range of motor switch-off protection, ranging from light to very heavy, fine control, accurate s structure, short circuit protection and thermal protection. As it is a type of electromagnetic circuit breakers, it has additional features such as automatic lockout, automatic reset, energy-saving, adjustable tripping current range, manual lock button and restarting. It is also equipped with a temperature monitoring system to increase the level of protection during operation.