Type A RCDs for Modern Domestic & Commercial Circuits
Type A RCDs are designed to detect AC and pulsed DC residual currents, making them the correct choice for today’s inverter-driven appliances, EV chargers, heat pumps, induction hobs and most modern domestic circuits. They provide fast, reliable disconnection where smooth DC leakage is unlikely but pulsed DC is present.
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Unlike older AC-type devices, Type A RCDs remain stable and responsive when equipment introduces DC components into the circuit. They are suitable for single-phase installations and are available in a range of current ratings and sensitivities for different protective requirements.
- Detects AC + pulsed DC faults for modern appliance compatibility
- Correct choice for heat pumps, EV chargers and induction cooking
- 18th Edition compliant for new installations and consumer unit upgrades
- Multiple ratings & sensitivities for different protection scenarios
- Stable operation in circuits with electronic or inverter-based loads
Type A RCDs are now considered the standard for general-purpose protection in most new builds and rewires, offering improved resilience and safety compared to legacy AC-type devices.
2 Pole Type A High Immunity RCD 40A 30mA (WAR240-030)
£18.28
The WAR240-030 is a 2 pole 40A 30mA Type A High Immunity RCD designed for reliable residual current protection in single-phase installations where stable performance and reduced nuisance tripping are important. Whitecliffe lists this range as suitable for EV installations and solar-related applications where modern...
A Type Time Delay RCD – 80A 100mA, 4 Pole (WARTD480-100)
£53.95
The WARTD480-100 A-Type 100mA Time Delay RCD is a 4 Pole S-Type device rated at 80A, designed for selective upstream protection. Its built-in delay ensures only downstream RCDs disconnect under fault, maintaining continuity on unaffected circuits. Commonly used in three-phase distribution systems, EV charging installations,...
A Type Time Delay RCD – 80A 100mA, 2 Pole (WARTD280-100)
£43.95
The WARTD280-100 A-Type 100mA Time Delay RCD is a 2 Pole S-Type device rated at 80A. Designed for upstream use in selective coordination systems, its built-in time delay ensures only the RCD closest to the fault disconnects, avoiding unnecessary shutdowns of healthy circuits. Ideal for...
A Type Time Delay RCD – 63A 100mA, 4 Pole (WARTD463-100)
£43.95
The WARTD463-100 A-Type 100mA Time Delay RCD is a 4 Pole S-Type device rated at 63A. Its built-in time delay ensures upstream discrimination, allowing downstream RCDs to trip first and preventing unnecessary power loss. Ideal for three-phase distribution boards, EV charging hubs, and renewable installs...
A Type Time Delay RCD – 100A 100mA, 4 Pole (WARTD4100-100)
£54.10
The WARTD4100-100 A-Type 100mA Time Delay RCD is a 4 Pole S-Type device rated at 100A for large-scale three-phase boards. Designed for upstream use, its time delay ensures proper discrimination, allowing downstream RCDs to trip first and keeping supply integrity across unaffected circuits. It’s a...
What Is a Type A RCD?
A Type A RCD is a residual current device that provides protection against electric shock and fire caused by AC and pulsed DC leakage faults. This makes it suitable for the majority of modern household and commercial circuits where inverter-driven equipment is used.
Where Type A RCDs Are Used
- Heat pumps and inverter-driven heating systems
- EV chargers that specify Type A protection
- Induction hobs and modern cooking appliances
- Washing machines, dryers and variable-speed motors
- General domestic circuits replacing outdated AC-type devices
Why Type A Instead of Type AC?
Older AC-type devices may fail to detect pulsed DC leakage produced by many modern appliances. A Type A RCD ensures correct operation, stable protection and compliance with current installation practices.
- Better compatibility with modern electronic loads
- Reduced nuisance tripping under realistic circuit behaviour
- Correct detection of pulsed DC leakage levels
Compliance & Standards
All Type A RCDs in this category comply with BS 7671 (18th Edition) and meet the performance characteristics of IEC/EN 61008 and IEC/EN 61009. They are suitable for new installations, upgrades and consumer unit replacements requiring modern fault detection.
Selecting Ratings & Sensitivity
Type A RCDs are available in different current ratings (e.g. 40A, 63A, 80A, 100A) and sensitivities such as 30mA or 100mA. The correct selection depends on the load characteristics, circuit function and inspection requirements.
Installer Benefits
Type A RCDs offer stable disconnection, cleaner compatibility with modern appliances and long-term reliability. Their use simplifies future testing, reduces callouts related to nuisance tripping and ensures installations meet modern electrical standards.