Miniature Circuit Breakers with Residual Current Protection

A miniature circuit breaker with residual current protection (RCBO) is a modular device that combines the overload and short-circuit protection of a miniature circuit breaker with the earth leakage protection of a residual current device in a single housing. It is used in distribution boards where outlets such as bathrooms, kitchens, outdoor sockets and machine lines are protected separately, so that a leakage on one line does not cut off the others. In the Siemens 5SU1, ABB DS201 and DS203NC and Schneider Electric iDPN Vigi series there are models in rated currents such as 6 A, 10 A, 16 A, 25 A and 32 A, with B or C curve, 30 mA and 300 mA thresholds, and 1P+N and 3P+N poles. Choose the rated current and tripping curve according to the line's cross-section and load, the residual current threshold according to the purpose of the protection (30 mA is for protection against electric shock, 300 mA against fire), the sensing type according to the kind of load, and the breaking capacity according to the short-circuit current. Type AC detects only sinusoidal alternating leakage currents, while type A also detects leakage with pulsating direct current components. An RCBO must not be confused with a residual current device that has no overcurrent protection; on a line using such a device, a miniature circuit breaker is also required.

Products

How to choose Miniature Circuit Breakers with Residual Current Protection

A miniature circuit breaker with residual current protection (RCBO) is a modular device that combines the overload and short-circuit protection of a miniature circuit breaker with the earth leakage protection of a residual current device in a single housing. It is used in distribution boards where outlets such as bathrooms, kitchens, outdoor sockets and machine lines are protected separately, so that a leakage on one line does not cut off the others.

  • Separate overcurrent/leakage protection, motor starting and local isolation requirements.
  • Select rated current, pole count and breaking capacity (kA) from the installation calculation.
  • Match coil voltage, auxiliary contacts and tripping curve to the control circuit and load type.

Frequently asked questions

What is Miniature Circuit Breakers with Residual Current Protection and where is it used?

A miniature circuit breaker with residual current protection (RCBO) is a modular device that combines the overload and short-circuit protection of a miniature circuit breaker with the earth leakage protection of a residual current device in a single housing. It is used in distribution boards where outlets such as bathrooms, kitchens, outdoor sockets and machine lines are protected separately, so that a leakage on one line does not cut off the others.

What should I compare when choosing Miniature Circuit Breakers with Residual Current Protection?

Choose the rated current and tripping curve according to the line's cross-section and load, the residual current threshold according to the purpose of the protection (30 mA is for protection against electric shock, 300 mA against fire), the sensing type according to the kind of load, and the breaking capacity according to the short-circuit current.

Where can I find technical details for Miniature Circuit Breakers with Residual Current Protection products?

It is used in distribution boards where outlets such as bathrooms, kitchens, outdoor sockets and machine lines are protected separately, so that a leakage on one line does not cut off the others.

Miniature Circuit Breakers with Residual Current Protection Selection Guide: Technical Criteria and Engineering Practice