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Type A RCBOs

Type A RCBOs combine MCB and RCD protection in one device, protecting individual circuits against overload, short circuit and residual current faults. They are used in modern consumer units, EV charger circuits, heat pump supplies, appliance circuits and inverter-fed 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 provides combined overload, short-circuit and residual current protection for one circuit, while detecting both AC and pulsating DC residual current.

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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.

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What Is 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 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.

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