High Immunity RCBO – 40A C Curve, Type A, 30mA
18th Ed. Compliant
2-Year Warranty
UK Stock
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The WER40C-030 is a 40A C Curve High Immunity Type A RCBO designed for EV chargers, motors, heat pumps, and commercial inverter-fed systems. It combines overload, short-circuit, and 30mA residual current protection in a single device, with high immunity electronics to resist nuisance tripping from harmonics or transients. Built with...
The WER40C-030 is a 40A C Curve High Immunity Type A RCBO designed for EV chargers, motors, heat pumps, and commercial inverter-fed systems. It combines overload, short-circuit, and 30mA residual current protection in a single device, with high immunity electronics to resist nuisance tripping from harmonics or transients.
Built with double pole disconnection and bi-directional wiring, this RCBO meets the requirements of the 18th Edition Wiring Regulations (Amendment 2) and is a robust choice for heavy duty residential or commercial installs.
Installer Tip: Use the C Curve for EV chargers, heat pumps, and motor-driven systems where inrush currents are significant. For lighter domestic circuits with low inrush loads, select the B Curve variant.
Key Features
- 40A C Curve Type A RCBO – overload, short-circuit & earth leakage protection
- High immunity design – reduces nuisance tripping
- 30mA sensitivity – regulation compliant
- 10kA breaking capacity – suitable for heavy duty use
- Double pole disconnection – isolates live + neutral conductors
- Bi-directional wiring – reversible line/load connections
- Complies with BS EN 61009 & 18th Edition Amendment 2
Compare High Immunity RCBOs
| Model | Rating | Curve | Application |
|---|---|---|---|
| WER32C-030 | 32A | C Curve | EV / Solar / Inrush Loads |
| WER40C-030 (This Product) | 40A | C Curve | Commercial / Heavy Duty EV / Motors |
When should I specify a 40A C Curve RCBO?
It’s recommended for circuits with heavy inrush loads such as EV chargers, motors, and heat pumps, especially in commercial installs.
What’s the advantage of high immunity?
It resists nuisance tripping caused by harmonics, switching surges, or transient voltages in inverter-driven systems.
Is this suitable for EV charge points?
Yes – it provides 30mA Type A protection, ideal for EV installations. For PME compliance, add a PME Fault Detection Unit.
Does this isolate live and neutral?
Yes – the RCBO disconnects both conductors for full compliance and safety.
- Type: A (detects AC + pulsating DC leakage)
- Rating: 40A
- Trip Curve: C
- Sensitivity: 30mA
- Breaking Capacity: 10kA
- Poles: 2 (double pole disconnection)
- Wiring: Bi-directional
- SKU: WER40C-030
- Standards: BS EN 61009 / IEC 61009
Best suited for heavy duty circuits with higher inrush demands, such as EV chargers, motors, and commercial heat pump systems. Provides high immunity protection to reduce nuisance tripping in inverter-fed environments.
- DIN rail mounted
- Ensure 40A rating matches circuit demand
- Bi-directional wiring allows flexible installation
- Must be installed by a qualified electrician
