How to Choose the Right MCB Rating for Your Home

An MCB (Miniature Circuit Breaker) automatically disconnects a circuit when current exceeds its rated capacity — protecting your wiring from overheating and fire. Each circuit in your home should have its own MCB, and the MCB rating must match the wire gauge and intended load. An undersized MCB trips constantly; an oversized one fails to protect the wire.

6A MCB: For very light circuits (LED lighting only, signal cables). Rare in residential use. 10A MCB: For lighting circuits using 1.5 sq mm wire — fans, LED lights, exhaust fans. 16A MCB: For standard power socket circuits using 2.5 sq mm wire — TVs, refrigerators, washing machines. 20A MCB: For heavier socket circuits or small ACs using 2.5 sq mm wire. 25A MCB: For 1.5-ton ACs using 4.0 sq mm wire. 32A MCB: For geysers and 2-ton ACs using 6.0 sq mm wire.

Type B MCBs trip at 3-5x rated current — suitable for residential circuits with resistive loads (lights, heaters, sockets). Type C MCBs trip at 5-10x rated current — needed for circuits with motors (ACs, washing machines, pumps) that draw high inrush current on startup. For most home circuits, Type C is the safer choice as it won't nuisance-trip when an AC compressor kicks in.

An RCCB (Residual Current Circuit Breaker) detects current leakage to earth and disconnects in milliseconds — it protects people from electric shock. Install a 40A/30mA or 63A/30mA RCCB as the main incoming protective device. This is different from an MCB and both are needed. Havells, ABB, and Schneider make reliable RCCBs. HandyPanda delivers all MCBs and RCCBs across Gurgaon in under 60 minutes.