Mahesh Chheda And Co.

It’s a 4-pole RCCB (residual-current circuit breaker), meaning all three phases + neutral are covered. Power Factor Shop+1

The 63 A rating: that’s the maximum continuous current the RCCB can carry under normal conditions. Power Factor Shop+1

The 100 mA sensitivity: it will trip when it detects an imbalance (usually leakage or fault current) of ≥ 100 milliamps. Best of Electricals+1

It’s for AC applications (415 V) — suitable for typical 3-phase supplies or heavy electrical circuits. Moglix+1