BG CUCRB40 Compact RCBO Type B 40A Circuit Breaker

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Single-pole residual current circuit breaker designed for high-load circuits with smooth DC fault detection. The BG CUCRB40 combines overload, short-circuit, and 30mA residual-current protection in one compact module, providing dual-function safety in a space-saving format that fits standard 35mm DIN rail consumer units.

Complete protection in one device. This Type B RCBO merges the functions of a residual current device (RCD) and miniature circuit breaker (MCB), eliminating the need for separate components. At 40A rating with 6kA breaking capacity, it handles high-power circuits—air conditioning systems, electric water heaters, and commercial appliances—while detecting both AC and smooth DC leakage currents that standard Type A devices miss.

Why Type B matters for modern installations. Type B RCBOs detect the complex fault currents generated by renewable energy systems, EV chargers, heat pumps, and variable-frequency drives. If your circuit includes solar inverters or modern variable-speed equipment, Type B protection is essential; Type A provides insufficient coverage for smooth DC faults these systems produce. For conventional household circuits with standard appliances, Type A suffices—but Type B upgrades existing circuits without compatibility issues.

Compact design saves valuable space. At 17.5mm width and 83mm height, this single-module RCBO takes up minimal room in the consumer unit, allowing electricians to fit more protective devices on the same DIN rail. The compact form does not reduce safety—breaking capacity and trip sensitivity remain consistent with larger alternatives.

Installation efficiency. Colour-coded in-line terminals and backed-out captive screws speed up wiring and reduce installation time. The device locks in on or off positions to prevent accidental operation changes. All components comply with EN/IEC 61009-1 and British Standards, with manufacturing approved to ISO 9001:2008 and BSI standards. Operating voltage is 230V AC 50Hz single-phase.