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 RCBO – 32A C Curve, Type A, 30mA (WER32C-030)
£19.80
The WER32C-030 is a 32A C Curve Type A High Immunity RCBO designed for circuits with higher inrush characteristics and modern electronic loads where unwanted tripping may be more likely. It is commonly specified for suitable EV charger circuits, solar PV systems, heat pumps, motors...
High Immunity RCBO – 40A B Curve, Type A, 30mA (WER40B-030)
£19.80
The WER40B-030 is a 40A B Curve High Immunity Type A RCBO designed for heavier duty residential and commercial circuits, including solar PV, battery storage, and EV-ready consumer units. It combines overload, short-circuit, and 30mA residual current protection with enhanced resistance to nuisance tripping caused...
4 Way Metal EV Protection Unit – 40A B Curve A-Type RCBO + SPD (WMRC40BSP)
£34.90
WMRC40BSP is a 4 way metal EV protection unit supplied with a 40A B Curve A-Type RCBO and built-in surge protection. Designed for EV charger circuits, it provides combined overload, earth leakage, and surge protection in one compact pre-configured enclosure. Installer Tip: The dual switch...
High Immunity RCBO – 40A C Curve, Type A, 30mA (WER40C-030)
£19.80
The WER40C-030 is a 40A C Curve Type A High Immunity RCBO designed for circuits with higher inrush characteristics, modern electronic loads and equipment where nuisance tripping may be more likely. It is commonly specified for suitable EV charger circuits, heat pumps, motors and inverter-fed...
High Immunity Type A Mini RCBO – 20A B Curve (WRB120B-030)
£11.85
WRB120B-030 is a 20A B Curve high immunity Type A mini RCBO designed for general-purpose domestic and commercial circuits. It combines overload, short-circuit, and residual current protection in one compact single-module device, making it ideal where board space is limited. As part of the Whitecliffe...
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.