Outlook
RCMsasadditionalreprotection
In accordance with DIN VDE 0100-530, RCMs coupled with switchgear with an
isolating function can be used as an alternative to re protection if residual current
protective devices (RCDs) cannot be used for re protection, because the operating
current of the circuit to be protected is greater than the greatest rated current of
the residual current protective devices (RCDs). A prerequisite for this is that the
response residual current does not exceed 300 mA and that the monitored net-
work is disconnected in the event of a failure in the residual current monitoring
device’s (RCM) control supply voltage.
7. Outlook
There is a growing demand for residual current protective devices in electrical
installations owing to the high level of protection they afford.
At the same time, the widespread use of residual current protective devices to
protect a large variety of different loads means that even more complex functi-
onal requirements need to be met. The use of Type B universal current-sensitive
residual current protective devices as well as super-resistant devices or variants for
harsh ambient conditions exemplify how requirements have increased. This trend
is predicted to continue in future.
Combinations of RCBOs are also increasing in popularity – either as a compact unit
or as an RC unit in conjunction with miniature circuit breakers that can be installed
where required.
These RCBO combination units are installed in all circuits of modern electrical
installations, combining maximum operating safety with electric shock and line
protection.
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