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Differential switch: connection diagram

A GFCI is a device capable of automatically turning off the power of a circuit when there is an anomaly thereon: loss of current due to lack of insulation of one of the circuit conductors or on a device connected to it last, or power demand of a device greater than what can support the circuit (overcurrent). It is therefore a device that ensures the protection of both goods and people (the differential circuit breaker providing only the protection of people).

Differential circuit breakers can be found in an installation:

  • The circuit breaker (or subscriber), at the head of the electrical panel, a sensitivity of 500 mA.
  • One or more circuit breakers protecting a dedicated circuit, with a sensitivity of 30 mA (diagram).
  • Differential circuit breakers associated with the various circuits of an electrical installation, with a sensitivity of 30 mA.

Installation of differential circuit breakers

The branch circuit breaker is located at the head of the customer panel, separate from it. Differential circuit breakers take place on the subscriber board, on rails. Their amperage is a function of the maximum permissible power required for the devices to be connected to the different circuits. The switches are powered from the top via conductors (bridges) or combs (much simpler).

Evolution of the NF C-15100 standard

Since November 2015, in nine and big renovation, all circuits must be protected against overcurrent and short circuit: only circuit breakers are allowed, circuit breakers are now prohibited.

Diagram of the differential switch

Differential switch: connection diagram

Differential switch: connection diagram

(photos / visuals: © Legrand, except special mention)

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