Three-phase four-wire leakage switch trip causes:

For the first reason, there is a live or neutral leakage to the load or wire.

For the second reason, there is a short circuit in the load or wire.

For the third reason, the load current is too large, causing an overload trip. Depending on the degree of overload, there will be a difference in time. The greater the overload, the faster the jump. If this is the case, check if the load is faulty or if the original switch has insufficient capacity.

For the fourth reason, the two loads of 380V and 220V are connected at the same time, and the current three phases are unbalanced, causing tripping. If this is the case, it is recommended to use a 220V load from a single-phase leakage protector in parallel with the pile head.