{"product_id":"bg-cucrb40-compact-rcbo-type-b-40a","title":"BG CUCRB40 Compact RCBO Type B 40A Circuit Breaker","description":"\u003cdiv\u003eLet me search for more specific technical details about Type B RCBOs and their applications to enhance the description with relevant context that buyers would want.\u003cp\u003e\u003cstrong\u003eSingle-pole residual current circuit breaker designed for high-load circuits with smooth DC fault detection.\u003c\/strong\u003e 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.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eComplete protection in one device.\u003c\/strong\u003e 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.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWhy Type B matters for modern installations.\u003c\/strong\u003e 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.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eCompact design saves valuable space.\u003c\/strong\u003e 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.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eInstallation efficiency.\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"bg rcbos","offers":[{"title":"Default Title","offer_id":54443140022599,"sku":"CUCRB40-01","price":12.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0966\/1156\/5895\/files\/b5155e9a-122f-4f5e-9f57-776c9c3da06a_500_500_1_viewport_desktop-productimage.png?v=1785180345","url":"https:\/\/electricallighting.co.uk\/products\/bg-cucrb40-compact-rcbo-type-b-40a","provider":"Electrical Lighting ","version":"1.0","type":"link"}