Circuit Breaker Types Compared: MCB, MCCB, ACB, RCCB & More

Circuit breakers come in various types to fit different industrial and residential needs. Let’s compare the most common ones.

1. MCB (Miniature Circuit Breaker)

Protects against overloads and short circuits in low-current applications (up to ~100 A).

2. MCCB (Molded Case Circuit Breaker)

Handles higher currents (up to ~2500 A) and offers adjustable trip settings—ideal for industrial use.

3. ACB (Air Circuit Breaker)

Used in high-voltage applications (up to few kV), featuring more precise thermal/magnetic protection and visible breaking mechanism.

4. RCCB/RCD (Residual Current/Device)

Detects earth leakage to prevent electric shock—commonly used in bathrooms, kitchens, and outdoor circuits.

5. Others (GFCI, VCB, SF6)

Ground-fault breakers, vacuum/circuit breakers, and SF6-insulated breakers serve niche high-voltage or environmental needs.

Conclusion

Selecting the correct breaker type is essential for system safety, regulatory compliance, and performance optimization.