Schneider A9F54240 Acti9 iC60H 2P 40A C Miniature Circuit breaker
SKUA9F54240
Original price
£49.00
-
Original price
£49.00
Original price
£49.00inc VAT£40.83exc VAT
£49.00
-
£49.00
Current price£49.00inc VAT£40.83exc VATinc VAT£40.83exc VAT
| /
Estimated delivery time: 1-2 working days
Description
Premium Circuit Protection for Modern Commercial Electrical Systems
Electrical protection is about more than stopping faults — it's about maintaining uptime, improving safety and reducing maintenance time.
The Schneider Acti9 iC60H A9F54240 is a professional-grade 40A Type C double pole miniature circuit breaker designed to protect commercial, industrial and high-performance electrical installations against overloads and short circuits. Built on Schneider Electric's trusted Acti9 platform, it combines robust fault protection with advanced diagnostic features that help electricians identify and resolve issues faster.
The Type C tripping curve makes the A9F54240 particularly well suited to circuits with moderate inrush currents. This includes LED lighting installations, HVAC systems, control equipment, transformers and small motor applications where startup currents can cause nuisance tripping on standard Type B breakers.
Can LED lighting circuits cause nuisance tripping on correctly sized MCBs?
Yes. Modern LED drivers can generate very high inrush currents when energised. Although the running current may be low, the combined inrush from multiple fittings can exceed the instantaneous trip threshold of an MCB. This is particularly common in commercial lighting installations with large numbers of LED drivers.
Why would a designer choose a 2-pole MCB instead of a single-pole MCB?
A double-pole MCB disconnects both live conductors simultaneously. This can improve safety during maintenance, simplify isolation procedures and satisfy project-specific requirements where complete circuit disconnection is preferred.
What is the biggest mistake when replacing an MCB?
Replacing a breaker with a larger current rating without understanding why it tripped in the first place. Overloads, insulation faults, damaged equipment and poor terminations can all cause breaker operation. Increasing the rating without proper investigation can compromise circuit protection.
Why do commercial installations often specify 10kA breakers instead of 6kA breakers?
Commercial and industrial electrical systems frequently have higher prospective short-circuit currents than domestic properties. A higher breaking capacity ensures the protective device can safely interrupt fault currents without damage to the installation.
When should a contractor consider an MCCB instead of an MCB?
As load requirements and fault levels increase, an MCCB may provide greater flexibility through adjustable trip settings, higher breaking capacities and improved discrimination. MCBs remain ideal for final circuits, while MCCBs are often used on larger distribution and sub-main applications.
