Protective Devices

Fuses, circuit breakers, RCDs, RCBOs.

In this section

Circuit Breakers - What's inside, how do they work
How a typical circuit breaker works for overloads and short circuits, plus a look inside.

Types of Circuit Breakers, B C D K and Z
Circuit breakers or MCBs and why there are different types are such as Type B and Type C. Covers the three most common types plus two others.

Residual Current Devices
How residual current devices (RCD) work and what is inside a typical example.

Fuses Explained and Examined
What fuses are for and how they react to short circuits and overloads.

Rewirable and Cartridge Fuses Tested
A selection of rewirable and cartridge fuses are subjected to overload and short circuit conditions.