NL1 Earth Leakage

1.1 Function

-Control electric circuits.

-Protect people against indirect contacts and additional protection
against direct contacts.

-Protect installations against fire hazard due to insulation faults.

-Residual current circuit breakers are used in housing, tertiary sector
and industry.

1.2 Selection

Detectable wave form:

1) AC class:

Tripping is ensured for slowly increasing
sinusoidal AC residual currents.

2) A class:

Tripping is ensured for sinusoidal AC residual
currents and for pulsed DC residual currents,
whether applied suddenly or increasing slowly.

3) S, G/SI class

Tripping is ensured not only for sinusoidal AC residual currents but also for pulsed DC residual currents whether applied suddenly or increasing slowly. S, G/SI type with filters against spurious tripping caused by harmonics and transient surges.

With the impact of 8/20us surge 3000A, this high immunity

RCCB will still be in stable status.