The item accords with IEC, VDE, CEE, and BS standards. This circuit with
AC 50/60Hz, 240V single phase, 415V three phases and below is for
industrial and mining purposes, large buildings, and commerce. To mainly
prevent electric fire and personal accident caused by personal electric
shock or leakage of electrified wire netting, this RCCB is
a current-operated, fast leakage protector, and is purely electromagnetic,
which can break off fault circuits rapidly in order to avoid accidents.

The item is precise, has fewer elements, no auxiliary power, and high
working reliability. The function of the switch won't be influenced by
ambient temperature and lightning. The mutual inductor of the item is used
to test vector differential values of passing currents, and produces
a relevant output power and adds it to the tripper in secondary winding.
If the current of vector differential value of protected circuit of
personal electric shock is up to or over leakage operating current, the
tripper will act and cut off for protection.