High Current MCBs 63A–125A for Sub-Mains & Heavy-Load Circuits

High current MCBs from 63A to 125A are used where a circuit carries more load than a standard final circuit breaker is designed for. They are commonly specified for sub-mains, plant equipment, HVAC systems, distribution board feeds, and other installations where higher current capacity is needed.

This range is built for electricians and contractors working on heavier-duty circuits, with options covering different current ratings, pole formats, and trip characteristics depending on the load and supply arrangement.

Compared with standard domestic MCB ratings, these devices are chosen where the installation design calls for a breaker that can handle a higher continuous current and protect larger cables, feeders, or more demanding equipment. That makes them a common choice on commercial boards, industrial systems, and larger specialist installations.

• 63A–125A current range – for larger loads and feeder circuits
• Single, 2 pole, 3 pole and 4 pole formats – to suit different supply arrangements
• B and C curve options – depending on circuit behaviour and inrush current
• Suitable for sub-mains and heavy-load circuits – including plant and building services
• Used in commercial and industrial boards – where stronger-duty circuit protection is required

Need related protection products? Browse our full MCB range, 3 pole MCBs, 4 pole MCBs, and three phase boards & accessories. For delivery and returns, see our delivery information and returns policy.