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4 Pole Type A RCD – 40A High Immunity (WAR440-030)
£25.60
ex VAT
£30.72 inc VAT
SKU: WAR440-030
The WAR440-030 is a 4 pole, 40A Type A RCD with high immunity, engineered to reduce nuisance tripping on circuits affected by surge currents or harmonics. Fully compliant with BS EN 61008-1 and BS EN 61008-2-1, it provides reliable residual current protection for three-phase distribution boards, EV charger installs, and...
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Description
The WAR440-030 is a 4 pole, 40A Type A RCD with high immunity, engineered to reduce nuisance tripping on circuits affected by surge currents or harmonics. Fully compliant with BS EN 61008-1 and BS EN 61008-2-1, it provides reliable residual current protection for three-phase distribution boards, EV charger installs, and other sensitive loads.
By using a high immunity design, this RCD maintains safety while filtering out brief disturbances that can cause standard Type A devices to trip unnecessarily. The 4-pole configuration ensures full protection across three-phase + neutral applications.
Installer Tip: Choose a high immunity Type A RCD where circuits include equipment with switching power supplies, drives, or frequent surge activity — such as EV chargers, HVAC systems, and LED lighting banks.
Key Features
- 40A, 4 Pole – suitable for three-phase + neutral applications
- High Immunity – reduces nuisance trips from harmonics and surges
- Type A sensitivity – detects AC and pulsed DC residual currents
- Compliant with BS EN 61008-1 & 61008-2-1
- Robust terminals and secure DIN rail mounting
- Compatible with three-phase distribution boards and EV-ready consumer units
Compare High Immunity RCD Variants
| Model | Poles | Rating | Immunity |
|---|---|---|---|
| WAR240-030 | 2 | 40A | High Immunity |
| WAR263-030 | 2 | 63A | High Immunity |
| WAR280-030 | 2 | 80A | High Immunity |
| WAR2100-030 | 2 | 100A | High Immunity |
| WAR440-030 (This Product) | 4 | 40A | High Immunity |
| WAR463-030 | 4 | 63A | High Immunity |
| WAR480-030 | 4 | 80A | High Immunity |
| WAR4100-030 | 4 | 100A | High Immunity |
Technical specs
- Model: WAR440-030
- Type: Type A, High Immunity
- Poles: 4
- Rated Current: 40A
- Rated Residual Current: 30mA
- Standard Compliance: BS EN 61008-1 / BS EN 61008-2-1
- Mounting: 35mm DIN rail
- Voltage: 230/400V AC
- Frequency: 50Hz
- Dimensions: 71.5 x 82 x 70mm
- Operating Temperature: -25°C to +40°C
Installation notes
Supplied ready for installation on DIN rail. Final connection must be completed by a qualified electrician. Ensure compatibility with the load, supply characteristics, and enclosure before fitting.
- Use in three-phase + neutral systems rated at 40A
- Maintain correct polarity and terminal torque settings
- Test with a calibrated RCD tester during commissioning
- Confirm the high immunity characteristic is suitable for the circuit type
FAQs
What does “high immunity” mean on this RCD?
It means the device is less prone to nuisance tripping caused by harmonics, surge currents, or transient disturbances, while still maintaining residual current protection.
Is this suitable for EV charger installations?
Yes – high immunity Type A RCDs are recommended for EV circuits where harmonics and DC leakage are more likely.
Can this RCD protect standard three-phase loads?
Yes – it provides protection across three-phase + neutral applications, making it suitable for distribution boards, HVAC systems, and industrial circuits.
What’s the difference between 2-pole and 4-pole versions?
2-pole RCDs protect single-phase circuits (line + neutral), while 4-pole models cover three-phase + neutral systems.
