Another name used is current balance circuit breaker. These are all used with grounded power supplies. An ELCB had a current sensing coil in series with the ground cable, so the supply would be tripped if current occurred in the ground lead. This was often combined with a voltage sensing coil on the frame also, which used a separated ground some distance away.
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Every year, Germany has approx. The latest electrical devices often have quite different characteristics in terms of current consumption than earlier devices, due to frequency converters in washing machines, for example, or switched-mode power supply units in TVs, PCs or LED lights. There are also decentralized power producers like photovoltaic systems or charging devices for electric vehicles.
All of this requires new protection strategies for electrical installations. This also includes appropriate residual current protection devices or residual current circuit breakers that will cut the current immediately and safely in the event of a fault.
Protection against indirect contact Protection against direct contact Preventing electric shocks and electrical fires Wiring errors, insulation faults, defective devices or faulty work on electrical systems can trigger dangerous residual currents — and cause accidents or electrical fires as a consequence. Residual current protective devices RCDs can prevent these from happening. They protect against dangerous shock currents when conductive objects that are under tension are touched, either directly or indirectly.
Residual current operated circuit breakers RCCBs quickly and safely cut the power to the monitored circuit if a set differential current is exceeded.
For many areas of application, the installation of RCCBs with rated residual currents no greater than 30 mA is mandatory in new buildings: for example, since in rooms with a bath or shower, and since , additionally, for all socket-outlet circuits with a rated current of up to 20 A that are intended for use by non-professionals and otherwise for general use.
Residual current protective devices
3VL Molded Case Circuit Breakers up to 1600 A, IEC
Earth Leakage Circuit Breakers
Miniature circuit breakers