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L'édito de Vincent BedouinIndividual protection
Individuals protection
Protects against direct contacts
Protection against direct contact of a person with live parts of a powered installation is made by the insulation of live parts, by the establishment of devices which ensure inaccessibility or remoteness, with automatic switch-off or the Safety Extra Low Voltage (SELV).
Protects against indirect contacts
Two types of differential device, in conjunction with an earth connection: the differential switch and the residual circuit breaker. They are mainly characterized by their sensitivity (in mA), which is the minimum leakage current that causes the differential to react.
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DIFFERENTIAL SWITCH
The differential switch, in conjunction with an earth connection, protects against indirect contacts. It has no protective device against overcurrents and short-circuits and so must be used in conjunction with a fuse-disconnecting switch or a circuit breaker located upstream.
Advantage
- Easy diagnosis of overcurrent/ differential faults.
- Price
- Compactness
RESIDUAL CURRENT CIRCUIT BREAKER
The Residual Current Circuit Breaker, in conjunction with an earth connection, both:
- protects against indirect contacts,
- protects against overcurrents and short-circuits