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

Industrial type circuit-      Acti 9 DIN-rail industrial
breaker Vigi Compact      Circuit-breaker with adaptable Vigi RCD module

Fig. F64: Industrial-type CB with 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

The incoming-supply        “Monobloc” Déclic Vigi residual
circuit-breaker can           current circuit-breakers intended
also have time-delayed     for protection of terminal socket-outlet
characteristics and          circuits in domestic and tertiary
integrate a RCD              sector applications.
(type S).

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

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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