The fixed residual current socket is used to protect people and property (increase in protection level). It is intended for use in existing installations in which a residual current circuit breaker cannot be installed in the main or sub-distribution board without considerable effort. The main target group is TN-C systems (classic zeroing) without a separate protective conductor PE. But the residual current socket can also be used in other system types such as TN-S and TT systems. The residual current socket has color-coded input terminals (N: blue, L: black, PE: yellow) and output terminals (L', N', PE). These can be used to connect the residual current socket to other individual SCHUKO sockets. It is not possible to combine the residual current socket in a multiple socket combination. The residual current socket works independently of the voltage and can handle sinusoidal alternating residual currents and pulsating direct residual currents. The phase conductor (L) and neutral conductor (N) are switched. It has a yellow function test button that must be pressed regularly. A black push button can be used to switch it back on after testing.
