Power Supply - ABB DS 941 Montage- Und Betriebsanleitung

Power supply

This residual current circuit breaker provides safe protection even
when the power supply middle wire is interrupted accidentally.
It can be utilized in single-phase installations supplied from phase
to neutral wires, and it can be installed in systems provided with the
following protection modes:
- connections to the neutral of metal parts above the installation point
- direct earthing of metal parts
- active protection against earth malfuction currents.
Equipment should be utilized according to CEI 64-8/IEC 364
regulation; they are provided with the built-in protection against
overloads and short circuits up to their plate nominal value, and
guaranteed against the overload of output wires.
In protection systems using direct earthing of metal frames,
coordination with the residual current circuit breaker provides
additional protection against the current dispersion to earth;.this
means increased safety in the event of electrical contacts.
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