Types of RCDs
From Electrical Installation Guide
Contents |
Types 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. F63)
| Industrial circuit-breakers with an integrated RCD are covered in IEC 60947-2 and its appendix B |
Industrial type circuit- Multi 9 DIN-rail industrial
breaker Vigi Compact Circuit-breaker with adaptable Vigi RCD module
Fig. F63: Industrial-type CB with RCD module
Adaptable residual current circuit-breakers, including DIN-rail mounted units (e.g. Compact or Multi 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. F64)
| 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. F64: Domestic residual current circuit-breakers (RCCBs) for earth leakage protection
Residual current circuit-breakers and RCDs with separate toroidal current transformer
(see Fig. F65)
| 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. F65: RCDs with separate toroidal current transformers (Vigirex)
