General

***It is TypeA-SI Time Delayed RCD RCCB ELCB 2P 4P 40A 63A 30mA0（0.03A)***
Earth-Leakage Protection Class : type A-SI (Super Immunised)

Type A RCD Features:
Tripping is ensured for sinusoidal, alternating residual currents as well as for pulsed DC residual currents, whether they be quickly applied or slowly increase.
Application: loads with electronics, rectifiers, instruments.



Type SI RCD Features: 
It's designed to avoid nuisance tripping or non-tripping in case of polluted network, lightning effect, high frequency currents, RF waves, etc.
SI type RCDs present a small tripping delay (80s~500s), allowing to let pass this transient current without nuisance tripping.

In certain cases, aspects of the environment can disturb the correct operation of RCDs:
"nuisance" tripping: Break in power supply without the situation being really hazardous. This type of tripping is often repetitive, causing major inconvenience and detrimental to the quality of the user's electrical power
supply.
Non-tripping, in the event of a hazard. Less perceptible than nuisance tripping, these malfunctions must still be examined carefully since they undermine user safety.