Form factors of RCDs

Residual current devices (RCD) are commonly incorporated in or associated with the following components:

• Industrial-type moulded-case circuit-breakers (MCCB) and air circuit-breakers (ACB) conforming to IEC 60947-2 and its appendix B and M
• Industrial type miniature circuit-breakers (MCB) conforming to IEC 60947-2 and its appendix B and M
• Household and similar miniature circuit-breakers (MCB) complying with IEC 60898, IEC 61008, IEC 61009
• Residual load switch conforming to particular national standards
• Relays with separate toroidal (ring-type) current transformers, conforming to IEC 60947-2 Appendix M

RCDs are mandatorily used at the origin of TT-earthed installations, where their ability to discriminate with other RCDs allows selective tripping, thereby ensuring the level of service continuity required.

Industrial type circuit-breakers with integrated or adaptable RCD module

(see Fig. F64)

Industrial circuit-breakers with an integrated RCD are covered in IEC 60947-2 and its appendix B

Fig. F64 – Industrial-type CB with RCD module

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  Industrial type circuit breaker Vigi Compact

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  Acti 9 DIN-rail industrial Circuit breaker ...

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  ... with adaptable Vigi RCD module

Adaptable residual current circuit-breakers, including DIN-rail mounted units (e.g. Compact or Acti 9), are available, to which may be associated an auxiliary RCD module (e.g. Vigi).
The ensemble provides a comprehensive range of protective functions (isolation, protection against short-circuit, overload, and earth-fault.

Household and similar miniature circuit-breakers with RCD

(see Fig. F65) 

Household or domestic circuit-breakers with an integrated RCD are covered in IEC 60898, IEC 61008 and IEC 61009

Fig. F65 – Domestic residual current circuit breakers (RCCBs) for earth leakage protection

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  The incoming-supply circuit breaker can also have time-delayed characteristics and integrate a RCD (type S).

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  “Monobloc” Déclic Vigi residual current circuit breakers intended for protection of terminal socket-outlet circuits in domestic and tertiary sector applications.

Residual current circuit-breakers and RCDs with separate toroidal current transformer

(see Fig. F66)

Residual current load break switches are covered by particular national standards.RCDs with separate toroidal current transformers are standardized in IEC 60947-2 appendix M

RCDs with separate toroidal CTs can be used in association with circuit-breakers or contactors.

Fig. F66 – RCDs with separate toroidal current transformers (Vigirex)

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