Semi-automatic self-monitoring fault-current circuit-breaker e.g. for main current conducting lines

摘要

The switch has main current contacts which form a disconnection point in the mains lines. It also has a total current transformer through which the mains lines are passed through as a primary winding. The output signal of the secondary winding is transmitted to a relay on the basis of a faulty current. The relay opens the contact. The switch also has a test current circuit with a test contact point. When this is closed a faulty current is simulated. When a connected load is first switched on and/or off it continually switches off using an electric device and is functional after it is first switched back on again. When the switch fails or the main current contacts are switched off with a non-simulated real faulty current, the main current lines are broken or interrupted using a diverse and/or redundant auxiliary cut off point and cannot be closed again.