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.
Read more
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.
A Type Time Delay RCD – 63A 100mA, 4 Pole (WARTD463-100)
£30.25
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 – 63A 100mA, 2 Pole (WARTD263-100)
£25.35
The WARTD263-100 A-Type 100mA Time Delay RCD is a 2 Pole S-Type device designed for upstream fault protection in dual-RCD or selective coordination setups. With its built-in delay, it ensures that downstream devices trip first, maintaining supply integrity across unaffected circuits. Ideal for EV charging...
A Type Time Delay RCD – 100A 100mA, 4 Pole (WARTD4100-100)
£38.85
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...
A Type Time Delay RCD – 100A 100mA, 2 Pole (WARTD2100-100)
£31.65
The WARTD2100-100 A-Type Time Delay RCD is a 2 Pole S-Type unit rated at 100A for heavy-duty upstream protection. Its built-in time delay ensures proper discrimination, allowing downstream RCDs to clear faults first while maintaining supply continuity elsewhere. Perfect for EV charging infrastructure, renewable installs,...
4 Pole Type A RCD – 80A High Immunity
£24.99
The WAR480-030 is a 4 pole, 80A Type A RCD with high immunity, designed for demanding three-phase applications where nuisance tripping must be avoided. Fully compliant with BS EN 61008-1 and BS EN 61008-2-1, it provides dependable residual current protection for distribution boards, EV chargers,...
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.