What’s the difference between MCB, MCCB, and ACB?
MCB protects final circuits (smaller currents, B/C/D curves). MCCB handles higher currents and fault levels with configurable trips. ACB is a draw-out main breaker for switchboards with advanced protection/comm options.
RCCB vs RCBO—when should I use each?
RCCB provides earth-leakage only; pair it with an MCB for over-current. RCBO combines MCB + RCD in one device, saving space and simplifying coordination.
How do I choose the right trip curve on an MCB?
Use B for resistive/low inrush, C for mixed and motor/light inductive loads, D for high-inrush loads (transformers, large motors). Confirm discrimination with upstream devices.