High Immunity RCBO – 20A C Curve, Type A, 30mA
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WER20C-030 is a 20A C Curve High Immunity Type A RCBO designed for EV chargers, motors, heat pumps, and inverter-fed systems. It provides combined overload, short-circuit, and 30mA residual current protection, while high immunity electronics reduce nuisance tripping from harmonics and transient voltages. Featuring double pole disconnection and bi-directional...
The WER20C-030 is a 20A C Curve High Immunity Type A RCBO designed for EV chargers, motors, heat pumps, and inverter-fed systems. It provides combined overload, short-circuit, and 30mA residual current protection, while high immunity electronics reduce nuisance tripping from harmonics and transient voltages.
Featuring double pole disconnection and bi-directional wiring, this RCBO is fully compliant with the 18th Edition Wiring Regulations (Amendment 2) and suitable for both domestic and commercial installs.
Installer Tip: Choose the C Curve when circuits have higher inrush loads such as EV charge points or motors. For lighting or socket circuits with low inrush, use the B Curve version instead.
Key Features
- 20A C Curve Type A RCBO – 30mA residual protection, 10kA breaking capacity
- High immunity design – resists false trips in noisy electrical environments
- Double pole disconnection – cuts both live and neutral conductors
- Bi-directional wiring – line/load reversible
- Engineered for EV, solar, and heat pump systems
- Complies with BS EN 61009 & 18th Edition regs
Compare High Immunity RCBOs
| Model | Rating | Curve | Application |
|---|---|---|---|
| WER20B-030 | 20A | B Curve | Domestic / Light Commercial |
| WER20C-030 (This Product) | 20A | C Curve | EV / Motors / Heat Pumps |
| WER32C-030 | 32A | C Curve | Heavier Duty EV / Inrush Loads |
| WER40C-030 | 40A | C Curve | Commercial / Heavy Duty Loads |
Why choose a C Curve RCBO?
C Curves are designed for circuits with higher inrush currents such as EV charge points, motors, and heat pumps. They trip more appropriately under startup loads compared to B Curves.
What does high immunity mean?
It reduces false trips caused by harmonics, switching surges, or transient voltages common in inverter-based systems.
Is this suitable for solar PV installs?
Yes – bi-directional wiring and high immunity protection make it compatible with inverter-fed solar circuits.
Does this disconnect live and neutral?
Yes – it provides full double pole disconnection for safe and compliant isolation.
- Type: A (AC + pulsating DC detection)
- Rating: 20A
- Trip Curve: C
- Sensitivity: 30mA
- Breaking Capacity: 10kA
- Poles: 2 (double pole)
- Wiring: Bi-directional
- SKU: WER20C-030
- Standards: BS EN 61009 / IEC 61009
Best suited for circuits with higher inrush current such as EV chargers, motors, and heat pumps. Provides high immunity protection in domestic and commercial boards.
- DIN rail mounted
- Ensure rating matches connected load
- Bi-directional wiring simplifies installation
- Qualified electrician installation required
