Keep electrical currents in their place with this MCB from ABB. It has two tripping mechanisms – a thermal release tackles overloads and an electromechanical device safeguards against short circuits. Thanks to its B-type characteristic, it trips instantly when it detects rogue loads between 3 and 5 times its 50A rating, so people and equipment are protected from small spikes and surges. For convenient fitting, the unit can be connected via a busbar, as well as flexible or rigid conductors. As there are failsafe cylinder-lift terminals that securely grab and position your wires, you'll have no trouble hooking it up.

• Front toggle switch with red and green indicators for easy operation
• Mechanical durability of 20,000 cycles ensures it's long-lasting
• Works reliably in temperatures between -25°C and +55°C to handle commercial and industrial environments

• Residential buildings
• Low-voltage industrial circuits
• Retail units
• Offices

Distribution boards from ABB's Protecta range (such as 539-1553) are a good fit for this type of MCB. The breaker's compact width of 17.5mm takes up minimal rail space.

ABB System Pro M Single & Double Pole MCB's

The Classic & System pro M product cannot be intermixed and do not share common accessories. System pro M products can only be fitted to new style Protecta distribution boards,see typically stock no. 539-1553.