4 Pole RCBO – 20A C Curve, Type A, 30mA (WCED WFR420C-030)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
Secure Payments With
The WCED WFR420C-030 is a 20A, C Curve, 4 Pole Type A RCBO that combines overcurrent protection and earth leakage protection in one device. Its switched neutral ensures full isolation of all conductors, delivering safer fault handling and compliance with BS 7671 (18th Edition). With a C Curve tripping profile,...
The WCED WFR420C-030 is a 20A, C Curve, 4 Pole Type A RCBO that combines overcurrent protection and earth leakage protection in one device. Its switched neutral ensures full isolation of all conductors, delivering safer fault handling and compliance with BS 7671 (18th Edition).
With a C Curve tripping profile, this RCBO is designed for circuits with higher inrush currents such as EV chargers, small motors, pumps, HVAC, and solar inverter systems. Its bidirectional, high immunity design ensures stability and reliability, even in demanding environments.
Installer Tip: Select the 20A C Curve for circuits with motor loads or inrush-heavy applications. For faster protection on resistive loads, consider the 20A B Curve version.
Key Features
- 20A, C Curve: Suited for high inrush current applications
- 4 Pole Isolation: Fully disconnects all live conductors and neutral
- Type A RCD: Detects AC and pulsating DC residual currents
- Switched Neutral: Allows safe insulation resistance testing
- High Immunity: Prevents nuisance tripping under electronic loads
- Bidirectional: Supports EV, solar, and inverter-driven systems
- Compact: Single-module DIN rail design (17.8mm)
- Compliance: 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 (This Product) | 20A | C | – |
| WFR432B-030 | 32A | B | View Product |
| WFR432C-030 | 32A | C | View Product |
| WFR440B-030 | 40A | B | View Product |
| WFR440C-030 | 40A | C | View Product |
What applications is the WFR420C-030 best for?
It’s ideal for 20A circuits with higher inrush currents such as EV chargers, HVAC, pumps, and solar inverter systems.
What’s the difference between B and C Curve?
B Curve trips faster on resistive loads like lighting or sockets. C Curve tolerates higher inrush before tripping, making it better for motors, EV, and renewable setups.
Does this RCBO fully isolate the circuit?
Yes – the switched neutral ensures full disconnection of live and neutral conductors.
Is it EV/renewable ready?
Yes – its high immunity and bidirectional design make it suitable for EV chargers, solar, and inverter-based systems.
Is it compliant with UK standards?
Yes – it complies with BS EN 61009-1 and BS 7671 (18th Edition Wiring Regulations).
- SKU: WFR420C-030
- Device Type: 4 Pole Type A RCBO
- Current Rating: 20A
- Curve: C
- Residual Current: 30mA, high immunity
- Poles: 4 (includes switched neutral)
- Isolation: Full disconnection of live & neutral conductors
- Dimensions (HxWxD): 67.6 × 71.6 × 67.5 mm
- Mounting: 35mm DIN rail
- Compliance: BS EN 61009-1, BS 7671:2018 (Amendment 2)
Install in accordance with BS 7671 (18th Edition). Always match current rating and curve to the circuit type.
- C Curve: Handles higher inrush loads (EV chargers, HVAC, pumps, solar inverters)
- Mounting: Fits 35mm DIN rail
- Testing: Switched neutral supports accurate insulation resistance testing
- Applications: Suitable for residential, commercial, and renewable installations
