Fi relays - Circuit breakers

The circuit breaker (also known as: RCD relay , touch protection relay , Year relay and life safety relay , or General also known as) is an electrical switching device that disconnects the network behind it if it detects a (relatively small) leakage current. Such a case can occur, for example, if a conductor or a consumer becomes earth-faulted, or if someone accidentally touches live parts of the network. It immediately detects a fault in the network or a malfunction of the equipment and releases it, de-energizing it. The device disconnects before the actual electric shock occurs. There are several types of relays, there are 10, 30, 100 milliampere versions. In general households, 30 mA (milliampere) is installed, and 100 mA is recommended for external plugs.

Type “A” protection is also the most suitable for household bypass current protection. Type A can detect all fault current waveforms that the AC type can, and their operating principle is the same. However, there are some important differences between the two types. Type A fi-relays can also detect pulsating direct current (sine-half-wave) bypass currents.