An RCCB that trips when another circuit is switched on is not automatically defective. A borrowed neutral can send return current outside the device’s sensing path, while an incorrectly selected residual-current type can leave a different problem: the device may…
Choosing an RCBO for a modern circuit is not just a matter of matching its ampere rating to the load. An EV charger, variable-speed appliance or solar inverter can change the residual-current waveform that the protective device must detect. A…
A breaker comparison can go wrong before the buyer reaches the catalogue: a current rating is treated as proof that the device can interrupt the available fault current, or an MCCB frame size is mistaken for its overload setting. Those…
Choosing an MCB by its amp rating alone leaves several important questions unanswered: will it tolerate the load’s starting current, disconnect a fault at the far end of the cable, and interrupt the highest fault current available at the panel?…