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⚡ Circuit Breaker

Residential Circuit Breaker

A circuit breaker is an automatic switch that protects wiring and equipment by interrupting current when it detects an overload or short circuit, and can be reset instead of replaced like a fuse. Residential boards use several types for different faults.

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Types

MCB

A Miniature Circuit Breaker (MCB) is a DIN-rail device that automatically disconnects a circuit on overload or…

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RCCB

A Residual Current Circuit Breaker (RCCB) monitors the balance between live and neutral currents and disconnec…

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RCBO

A Residual Current Breaker with Overcurrent (RCBO) combines earth-leakage detection with overload and short-ci…

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MCCB

A Moulded Case Circuit Breaker (MCCB) is a higher-capacity breaker for main incomers and larger circuits, prot…

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Surge Protector

A Surge Protection Device (SPD) is not a circuit breaker but a board component that diverts transient overvolt…

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FAQ

What is the difference between a fuse and a circuit breaker?
A fuse melts and must be replaced after a fault, while a circuit breaker trips mechanically and can be reset. Breakers also offer more consistent trip characteristics.
Can one device protect against both overload and earth leakage?
Yes. An RCBO combines the overload/short-circuit protection of an MCB with the earth-leakage detection of an RCCB in a single unit.
What does the trip curve (B, C, D) mean?
It defines how quickly a breaker trips on short-circuit inrush current relative to its rating. B suits resistive loads, C is general purpose, and D handles high inductive inrush such as motors.

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