Siemens SENTRON - Page 18

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Residual current protective devices
CBRs and MRCDs are especially intended for applications with higher rated
currents (> 125 A).
• PRCDs are portable residual current protective devices which are integrated,
for example, in connectors or in multiple socket outlets.
• SRCDs are, according to DIN VDE 0662, non-portable residual current protective
devices which are integrated in a socket outlet or form a single unit with a
socket outlet.
PRCDs and SRCDs can be used to raise the level of protection for applications in
which the required protective measure is ensured in some other manner. They are
not permissible as a protective measure with disconnection of the supply.
Figure 4: Classi cation of residual current protective devices (RCDs)
RCD
Residual current device
RCCB RCBOCBR PRCD SRCD
Modular residual current devices (without integral current breaking devices)
Circuit breakers incorporating residual current protection
Residual current operated circuit breaker *
Residual current operated circuit breaker with overcurrent protector *
Portable-residual current protective device
Socket-outlet-residual current protective device
* System voltage-independent detection and tripping
Protection objectives:
• Additional protection with rated residual
current I
Δn
≤ 30 mA
• Fault protection with rated residual current
I
Δn
> 30 mA
• Fire protection with rated residual current
I
Δn
≤ 300 mA
All residual current protective devices comply
with the DIN VDE standards
Not for protective
measure according to
DIN VDE 0100-410,
only local protection
level increase
MRCD