Type A RCBOs for Modern Circuits & Inverter Loads
Type A RCBOs combine overcurrent and residual current protection in one device, making them a practical choice for modern circuits where space, compliance, and reliable fault protection all matter. They are commonly used on circuits serving EV chargers, heat pumps, appliances with electronic controls, and other loads where AC and pulsating DC residual currents may be present.
Compared with older Type AC devices, Type A RCBOs are better suited to today’s installations, especially where inverter-driven or electronically controlled equipment is involved.
Quick answer: A Type A RCBO is used where you need combined MCB and RCD protection on a single circuit, with detection of both AC and pulsating DC residual current. They are widely specified for modern domestic and commercial circuits, especially where electronic loads are involved.
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This collection includes B and C curve Type A RCBOs in a range of current ratings, alongside options with different breaking capacities and high immunity performance depending on the circuit design. These devices are widely used in consumer units, upgraded boards, and specialist circuits where a standard RCBO needs to cope with more modern load characteristics.
- Type A residual current detection – suitable for AC and pulsating DC leakage
- B & C curve options – choose to suit circuit type and inrush profile
- 6kA & 10kA devices – for a range of domestic and commercial applications
- High immunity models available – useful where nuisance tripping is a concern
- Compact formats available – including space-saving options for tighter boards
Looking for a more specific variant? Browse our high immunity RCBOs, 10kA RCBOs, mini Type A RCBOs, or full RCBO range. For delivery and returns, see our delivery information and returns policy.
High Immunity Type A Mini RCBO – 25A B Curve (WRB125B-030)
£11.85
The WRB125B-030 High Immunity Type A Mini RCBO is a 25A B Curve protective device that combines overload, short-circuit, and residual current protection in a single compact unit. At just 18mm wide, it’s ideal for space-limited boards in residential or light commercial installs. With 30mA...
High Immunity Type A Mini RCBO – 40A C Curve (WRB140C-030)
£11.85
The WRB140C-030 High Immunity Type A Mini RCBO is a 40A C Curve protective device designed for circuits with motors, pumps, and equipment that draw higher inrush currents. At just 18mm wide, it combines overload, short-circuit, and residual current protection in one compact unit. With...
High Immunity Type A Mini RCBO – 20A C Curve (WRB120C-030)
£11.85
The WRB120C-030 High Immunity Type A Mini RCBO is a 20A C Curve protective device designed for circuits with higher inrush currents. Compact at just 18mm wide, it combines short-circuit, overload, and residual current protection in one unit. With 30mA Type A sensitivity and high...
High Immunity Type A Mini RCBO – 10A B Curve (WRB110B-030)
£11.85
The WRB110B-030 High Immunity Type A Mini RCBO is a compact 10A B Curve protective device designed for domestic and commercial boards where space is limited. At just 18mm wide, it combines residual current and overcurrent protection in one module. With 30mA Type A sensitivity,...
High Immunity Type A 4 Pole RCBO – ADR440C
£37.14
The ADR440C High Immunity Type A 4 Pole RCBO is a 40A protective device designed for three-phase circuits where both AC and smooth DC leakage currents may occur. With 30mA residual current protection, 6mA DC detection, and a 10kA short-circuit rating, it delivers reliable protection...
Why Choose a Type A RCBO?
A Type A RCBO protects a circuit against both overload / short circuit faults and residual current faults in a single device. That makes it a practical, board-efficient option for individual circuit protection, especially in installations using modern equipment with electronic components, rectifiers, or inverter-driven loads.
What Type A Means
Type A refers to the residual current detection characteristic of the device. A Type A RCBO can detect alternating residual current and pulsating DC residual current, which makes it better suited than older Type AC devices for many modern circuits.
Where Type A RCBOs Are Commonly Used
- EV charger circuits – where modern protective device selection matters. See our EV kits.
- Heat pump supplies – particularly where electronically controlled equipment is involved. Browse heat pump boards.
- Modern domestic circuits – kitchens, utility circuits, outdoor power and appliance-fed circuits
- Commercial boards – where individual circuit protection and appropriate residual current characteristics are required
How to Choose the Right Type A RCBO
- Current rating – choose the amp rating to suit the circuit design
- B or C curve – B curve is common for standard circuits, while C curve may suit circuits with higher inrush
- 6kA or 10kA – select the breaking capacity required for the installation
- High immunity – useful on circuits where unwanted tripping could otherwise be an issue
- Physical format – compact and mini formats can help where board space is tight
Featured Type A RCBO Options
- Type A RCBO – WRT Range – a strong option for modern domestic and commercial circuits.
- Mini Type A High Immunity RCBO – compact format for tighter consumer unit layouts.
- Type A RCBO EV Kit with SPD – pre-configured protection for EV applications.
Type A RCBOs vs Other Protection Devices
Type A RCBOs sit alongside a wider range of circuit protection options. If you need broader product selection, browse our full RCBO range. For applications involving smooth DC residual current, you may need to consider Type B RCDs instead. Where nuisance tripping is the priority, our high immunity RCBOs may be the better fit.
FAQs on Type A RCBOs
What is a Type A RCBO?
A Type A RCBO is a protective device that combines MCB and RCD functions in one unit and detects both AC and pulsating DC residual current.
Why use Type A instead of Type AC?
Type A devices are generally better suited to modern circuits with electronic equipment, as they can detect pulsating DC residual current that older Type AC devices are not designed for.
What’s the difference between 6kA and 10kA RCBOs?
The difference is the device’s short-circuit breaking capacity. The correct choice depends on the fault level and design requirements of the installation.
Do I need a high immunity Type A RCBO?
High immunity can be useful where a circuit has background leakage or operating conditions that make nuisance tripping more likely.
Why Buy Type A RCBOs from Power & Data UK?
Power & Data UK supplies trade-focused circuit protection products with practical product choice, dependable UK stock, and fast dispatch. Orders over £30 qualify for free UK mainland next-day delivery, and products are backed by a 2-year manufacturer warranty. For unwanted items, see our returns policy.