High Immunity Type A Mini RCBO – 40A C Curve (WRB140C-030)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WRB140C-030 High Immunity Type A Mini RCBO is a 40A C Curve protective device designed for circuits with motors, pumps, and equipment that draw higher inrush currents. At just 18mm wide, it combines overload, short-circuit, and residual current protection in one compact unit. With 30mA Type A sensitivity and...
The WRB140C-030 High Immunity Type A Mini RCBO is a 40A C Curve protective device designed for circuits with motors, pumps, and equipment that draw higher inrush currents. At just 18mm wide, it combines overload, short-circuit, and residual current protection in one compact unit. With 30mA Type A sensitivity and high immunity, it provides stable fault protection for EV chargers, renewable systems, and heavier appliance circuits where nuisance tripping must be avoided.
Installer Tip: Choose the 40A C Curve when circuits include EV chargers, motors, or commercial tools with high start-up currents. For general higher-load circuits without heavy inrush, see the 40A B Curve variant.
Key Features
- 40A rated current – protects higher-load socket and appliance circuits
- C Curve tripping – tolerates inrush from motors, pumps, and EV chargers
- Type A sensitivity – detects AC + pulsating DC leakage
- High immunity design – prevents nuisance tripping under harmonics
- 18mm compact module – saves space in consumer units
- Switched live & neutral – ensures safe full isolation
- Bi-directional – compatible with PV and EV systems
Compare Mini RCBO Variants
| Model | Rated Current | Curve | Type | Width |
|---|---|---|---|---|
| WRB140B-030 | 40A | B Curve | Type A, High Immunity | 18mm |
| WRB140C-030 (This Product) | 40A | C Curve | Type A, High Immunity | 18mm |
What’s the WRB140C-030 designed for?
It’s suited to 40A circuits with high inrush loads such as EV chargers, pumps, motors, and commercial tools.
Why pick C Curve over B Curve?
The 40A B Curve is better for general high-load circuits, while C Curve devices tolerate inrush currents before tripping.
Does this RCBO meet UK wiring regulations?
Yes – with 30mA Type A protection and high immunity design, it complies with 18th Edition requirements.
Does it fully disconnect live and neutral?
Yes – both conductors are switched for safe isolation during trips or testing.
- Product Code: WRB140C-030
- Rated Current: 40A
- Curve: C Curve
- Breaking Capacity: 6kA
- Poles: 1P + switched neutral
- Trip Sensitivity: 30mA
- Earth Leakage Detection: Type A (AC + pulsating DC)
- Module Width: 18mm
- Dimensions: 18 × 90 × 77 mm
- Standards: BS EN 61009-1
The WRB140C-030 is suitable for DIN rail consumer units and distribution boards where circuits involve higher inrush loads. All installation must be completed by a qualified electrician.
- Best for EV chargers, pumps, motors, and inrush-heavy tools
- C Curve tripping – withstands high start-up surges before disconnecting
- Compact 18mm module – maximises board space
- Switched neutral – safer testing and full isolation
- Complies with 18th Edition wiring regulations
