Phoenix Contact 0914853 A thermal-magnetic circuit breaker is a type of protection device that can be quickly activated in the event of an electrical fault, with two poles (N/O and N/C) allowing for multiple applications, and features a fast blow mechanism to rapidly isolate the power source. It is typically equipped with one normally open (N/O) contact and one normally closed (N/C) contact, which can be configured to meet specific circuit requirements. The device also comes with an adjustable foot that allows it to be mounted on either the NS 32 or NS 35 standards, providing flexibility in its installation location.