10kA MCBs for High Fault-Level Circuits
10kA MCBs are miniature circuit breakers designed for circuits with higher prospective fault currents. They offer a higher breaking capacity than standard domestic breakers, making them suitable for commercial boards, industrial panels, three-phase supplies and installations close to the transformer where fault levels are elevated.
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These MCBs provide reliable overcurrent and short-circuit protection with 10,000 A breaking capacity, ensuring safe operation in environments where higher fault energy is expected. They are available in a full range of current ratings and tripping curves, allowing installers to select the correct device based on circuit behaviour and load type.
- 10kA breaking capacity for high fault-level environments
- Available in B and C curves for domestic, commercial and industrial applications
- Wide rating range including 6A, 10A, 16A, 32A and higher
- Single-module DIN-rail format for easy installation
- Stable disconnection under heavy short-circuit conditions
10kA MCBs are routinely specified in commercial distribution boards, three-phase supply setups, and circuits located near the incoming supply where prospective fault currents exceed the capabilities of standard 6kA breakers.
50A 2 Pole 10kA MCB – C Curve (WKC250C)
£7.49
The WKC250C is a 50 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) designed for high-demand single-phase or split-load circuits with moderate inrush current. With a C-curve tripping profile, it provides reliable protection for plant equipment, heating systems, and heavy lighting circuits where initial...
40A 2 Pole 10kA MCB – C Curve (WKC240C)
£7.49
The WKC240C is a 40 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) providing robust short-circuit and overload protection for moderate inrush applications. The C-curve tripping characteristic is ideal for HVAC systems, small machinery, and feeder circuits where start-up currents exceed standard B-curve tolerances....
40A 2 Pole 10kA MCB – B Curve (WKC240B)
£7.49
The WKC240B is a 40A 2 Pole 10kA Miniature Circuit Breaker (MCB) designed to protect higher-load radial and feeder circuits against short-circuit and overload faults. The B-curve tripping profile ensures rapid disconnection for resistive and low-inrush circuits such as outbuilding sub-mains, immersion heaters, and EV...
32A 2 Pole 10kA MCB – C Curve (WKC232C)
£7.49
The WKC232C is a 32 A 2 Pole 10 kA Miniature Circuit Breaker (MCB) designed for reliable short-circuit and overload protection on circuits with moderate inrush current. The C-curve tripping profile provides tolerance for start-up surges — perfect for motors, ring mains, and sub-distribution feeds....
32A 2 Pole 10kA MCB – B Curve (WKC232B)
£7.49
The WKC232B is a 32A 2 Pole 10kA Miniature Circuit Breaker (MCB) providing fast and reliable protection against short-circuit and overload faults. Designed for ring mains, small distribution boards, and fixed-appliance feeds, this B-curve breaker offers quick disconnection for resistive and low-inrush circuits. Its dual-pole...
What Makes a 10kA MCB Different?
A 10kA MCB is engineered to interrupt short-circuits up to 10,000 amps without catastrophic failure. This higher breaking capacity ensures safety and compliance in installations where the calculated PFC (Prospective Fault Current) exceeds domestic levels.
Where 10kA MCBs Are Used
- Commercial and industrial distribution boards
- Three-phase supplies with higher fault levels
- Installations close to the service head or transformer
- Workshops, plant rooms and machinery feeds
- Retrofits where standard 6kA devices are insufficient
B Curve vs C Curve 10kA MCBs
B Curve: Trips between 3–5 × rated current. Suitable for lighting circuits and resistive loads.
C Curve: Trips between 5–10 × rated current. Ideal for motor-driven or surge-prone circuits.
When to Specify 10kA Breaking Capacity
A 10kA MCB should be used whenever fault calculations or the measured PFC approach the limit of a 6kA device. Commercial boards, workshops and three-phase panels often require this rating as standard.
- Higher fault-current environment
- Near incomer or transformer
- Industrial machinery circuits
- Large commercial properties
Compliance & Standards
All 10kA MCBs in this category are designed to comply with BS EN 60898 and meet the performance and safety expectations of the 18th Edition Wiring Regulations. They are suitable for new installations and replacement upgrades requiring higher fault protection.
Installer Benefits
10kA MCBs provide confidence and compliance in higher-risk environments. Their robust construction, predictable tripping characteristics and wide rating availability make them a dependable choice for professional electricians working on commercial, industrial and high-demand domestic installations.