Hager AFDD RCBO’s

Hager AFDD RCBOs (Arc Fault Detection Devices with Residual Current and Overcurrent protection) are advanced circuit protection devices that combine three key safety functions in a single unit: arc fault detection, overload and short-circuit protection, and residual current (earth leakage) protection.

Designed for use within Hager consumer units, they continuously monitor the electrical waveform to identify dangerous arc faults that traditional devices may not detect. If a fault is identified, the device automatically disconnects the circuit, helping to prevent electrical fires while also protecting against electric shock and overcurrent conditions. This makes Hager AFDD RCBOs one of the most comprehensive protection solutions available for modern installations.

An arc fault occurs when electricity jumps across a gap between conductors, often due to damaged cables, loose connections or deteriorating insulation. This creates high temperatures and sparks, which can ignite surrounding materials such as wood, insulation or dust.

Unlike overloads or short circuits, arc faults may not generate enough current to trip standard Hager MCBs or RCBOs. This means they can go undetected while still posing a serious fire risk, particularly in concealed wiring. Hager AFDD RCBOs are specifically designed to detect these faults early and disconnect the supply before a fire can develop.

Under BS 7671 (18th Edition Wiring Regulations) Amendment 2, AFDDs are recommended for a wide range of installations and are particularly important in higher-risk residential buildings. These include houses in multiple occupation (HMOs), purpose-built student accommodation and care homes.

Hager AFDD RCBOs are typically specified for circuits supplying socket outlets up to 32A, where the risk of arc faults and fire is higher. While not mandatory in every installation, their use is increasingly encouraged as part of best practice, helping electricians meet modern safety expectations and future-proof installations.

A Hager RCBO provides protection against overloads, short circuits and earth leakage faults, helping to prevent electric shock and wiring damage. However, it does not detect arc faults.

A Hager AFDD RCBO builds on this by adding advanced arc fault detection, allowing it to identify and respond to conditions that could lead to electrical fires. In simple terms, a Hager AFDD RCBO offers all the protection of a Hager RCBO, with an additional layer of fire prevention that standard devices cannot provide.

Hager AFDD RCBOs are typically installed in environments where enhanced fire protection is required or recommended. This includes higher-risk residential buildings such as HMOs, student accommodation and care homes, as well as modern domestic installations where safety is a priority.

They are commonly used on final circuits supplying socket outlets up to 32A, particularly where wiring may be concealed or vulnerable to damage. When used within Hager consumer units, they provide a high-spec solution for installations where maximum protection and compliance are important.

Yes. Hager AFDD RCBOs combine the functions of an MCB and an RCBO, along with arc fault detection, into a single device. This allows them to replace multiple protection components within a Hager consumer unit, helping to simplify installation and optimise space.

By consolidating protection into one unit, they ensure that each circuit benefits from comprehensive coverage, including protection against overloads, short circuits, earth leakage and arc faults, making them ideal for modern, high-spec electrical installations.