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 4 Pole 10kA MCB B Curve – WKC450B
£14.16
The WKC450B is a 50A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral systems. With a B Curve trip characteristic, it is intended for resistive load applications such as socket outlet groups, small power distribution boards, and general lighting circuits in...
40A 4 Pole 10kA MCB D Curve – WKC440D
£14.16
The WKC 4 Pole 10kA Miniature Circuit Breaker (MCB) range provides robust protection for three-phase + neutral circuits in commercial, industrial, EV, and solar installations. With ratings from 6A to 63A and B, C, or D curve options, these breakers are built to handle overloads...
40A 4 Pole 10kA MCB C Curve – WKC440C
£14.16
The WKC440C is a 40A 4 pole 10kA Miniature Circuit Breaker (MCB) designed for three-phase + neutral protection. With its C Curve trip profile, it is built for inductive load circuits such as motors, pumps, HVAC systems, EV chargers, and commercial lighting in three-phase boards,...
40A 4 Pole 10kA MCB B Curve – WKC440B
£14.16
The WKC440B is a 40A 4 pole 10kA Miniature Circuit Breaker (MCB) for three-phase + neutral circuits. With its B Curve trip characteristic, this breaker is intended for resistive load circuits such as socket outlet banks, small distribution boards, and lighting groups in commercial three-phase...
4 Pole MCB 10kA C Curve 100A WKC4100C
£30.67
The WCED WKC4100C is a 4 Pole 100A MCB with a C curve tripping characteristic and a 10kA breaking capacity. Designed for high-demand installations, it provides reliable protection against overloads and short-circuits while also serving as an isolator when required. Commonly used in EV charging...
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.