A miniature circuit breaker (MCB) is an essential component of any modern electrical installation. It protects against the consequences of sudden faults, short circuits, and overloads in electrical equipment, while also helping to extend the service life of the installation. For a circuit breaker to fulfill its function, it should be characterized by sufficiently high sensitivity, speed of operation, precision, and retention of its properties after repeated use.
There are various types of circuit breakers available on the market.
For residential installations, circuit breakers with tripping characteristic B are recommended, in which the overload release is set to 1.13-1.45 times the rated current. An example of such a device is the SZ203 modular circuit breaker from ABB, which complies with the IEC/EN 60898-1 standard and features a maximum breaking capacity of 6 kA. The device was designed and created with the characteristics of home installations and devices connected to it in mind.