ABB System Pro M Compact S200 Miniature Circuit Breaker, 3-Pole, 40 A, Type C, 400 V ac AC, 12 V DC

Install this 3-pole MCB from ABB to ensure your electrical circuit automatically switches off when faults occur. It uses an electromechanical and a thermal mechanism to provide both overload and short-circuit protection. The breaker has type-C tripping characteristics, meaning it instantly trips the circuit when it detects loads that are between five and ten times the rated current of 40A. As it's mountable in any position and works with AC and DC input voltages, it's a versatile option. It's also possible to mount an auxiliary contact on the bottom to save cabinet space.

• Red and green indicators make it easy to tell if circuits are on or off

• Schools and colleges

This MCB has screw terminals, so you can achieve a secure wire attachment with a size two Pozidriv screwdriver. They're failsafe bi-directional cylinder-lift terminals, to help minimise wiring errors.