4 Pole RCBO – 40A C Curve, Type A, 30mA (WCED WFR440C-030)
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WCED WFR440C-030 is a 40A, C Curve, 4 Pole Type A RCBO, engineered for circuits with heavy inrush demand such as EV chargers, motors, HVAC systems, and renewable energy boards. It combines MCB and RCD functions into one compact device, with a switched neutral for full isolation of all...
The WCED WFR440C-030 is a 40A, C Curve, 4 Pole Type A RCBO, engineered for circuits with heavy inrush demand such as EV chargers, motors, HVAC systems, and renewable energy boards. It combines MCB and RCD functions into one compact device, with a switched neutral for full isolation of all conductors.
As part of the WFR4 Series, this unit is bidirectional, high immunity, and designed to meet BS EN 61009-1 and the 18th Edition Wiring Regulations. It ensures safe, reliable fault disconnection in demanding residential, commercial, and renewable installations.
Installer Tip: Use the 40A C Curve model where circuits experience high start-up currents. If protection is required for purely resistive loads, consider the 40A B Curve version instead.
Key Features
- 40A C Curve: Optimised for high inrush applications
- 4 Pole Isolation: Disconnects all live conductors plus neutral
- Type A RCD: Detects AC and pulsating DC leakage
- Switched Neutral: Safer insulation resistance testing
- High Immunity: Reduces nuisance tripping with electronic loads
- Bidirectional: EV & renewable ready
- Compact: Single-module DIN rail mount (17.8mm)
- Compliant: BS EN 61009-1, 18th Edition Wiring Regulations
Other Variants in the WFR4 Series
| Model | Rating | Curve | Link |
|---|---|---|---|
| WFR406B-030 | 6A | B | View Product |
| WFR406C-030 | 6A | C | View Product |
| WFR410B-030 | 10A | B | View Product |
| WFR410C-030 | 10A | C | View Product |
| WFR416B-030 | 16A | B | View Product |
| WFR416C-030 | 16A | C | View Product |
| WFR420B-030 | 20A | B | View Product |
| WFR420C-030 | 20A | C | View Product |
| WFR432B-030 | 32A | B | View Product |
| WFR432C-030 | 32A | C | View Product |
| WFR440B-030 | 40A | B | View Product |
| WFR440C-030 (This Product) | 40A | C | – |
What’s the WFR440C-030 best for?
It’s best for 40A circuits with high inrush demand such as EV charging hubs, HVAC equipment, motors, and solar inverter setups.
What’s the difference between B and C Curve?
B Curve devices trip faster on resistive loads, while C Curve devices are designed to handle higher inrush currents before tripping.
Does this RCBO fully isolate?
Yes – it disconnects all live conductors and neutral thanks to its switched neutral design.
Is it renewable and EV ready?
Yes – the WFR4 range is bidirectional and high immunity, making it ideal for renewable energy and EV applications.
Is it compliant with UK wiring standards?
Yes – it meets BS EN 61009-1 and the 18th Edition Wiring Regulations.
- SKU: WFR440C-030
- Device Type: 4 Pole Type A RCBO
- Current Rating: 40A
- Curve: C
- Residual Current: 30mA, high immunity
- Poles: 4 (with switched neutral)
- Isolation: Disconnects all live conductors plus neutral
- Dimensions (HxWxD): 67.6 × 71.6 × 67.5mm
- Mounting: DIN rail, 35mm
- Compliance: BS EN 61009-1, BS 7671:2018 (Amendment 2)
Installation must be performed by a qualified electrician in line with BS 7671 (18th Edition). Always match the rating and curve to the circuit characteristics.
- C Curve: Ideal for high inrush circuits (EV chargers, motors, HVAC, solar)
- Mounting: Standard 35mm DIN rail
- Testing: Switched neutral simplifies insulation resistance tests
- Applications: Domestic, commercial, and renewable energy systems
