What is the Difference Between RCBO and AFDD?

When it comes to electrical safety, RCBO and AFDD are two important devices. They both protect circuits, but they serve different purposes. Let’s explain their differences simply and honestly. We’ll focus on AFDD, a key device for arc fault safety.

1. Core Protection Focus

AFDD (Arc Fault Detection Device) is specifically designed to identify hazardous arc faults—the type of arcing that can easily trigger electrical fires. Upon detection, the AFDD rapidly disconnects the power supply. It complies with international and domestic standards such as IEC/EN 62606 and GB/T 31143. For instance, SINGI's SGB5LAFD-40 model integrates short-circuit, overload, and leakage protection functions in addition to arc fault protection.

RCBO ,also referred to as Residual Current Circuit Breaker with Overcurrent Protection, primarily addresses two risks: one is leakage current (residual current), which may cause electric shock, and two is overcurrent, including overload or short circuit.

2. Application Scenarios

AFDD: It works well in many places. You can use it in homes, offices and small factories. SINGI’s AFDD handles harsh conditions. It operates in temperatures from -25℃ to 70℃. It fits different wiring needs and keeps circuits safe from fire risks.

RCBO: It is more common in settings where electric shock risk is high. This includes bathrooms, kitchens and outdoor outlets. It also protects against overcurrent in regular circuits. It ensures people and equipment stay safe from shocks and overload damage.

3. Key Functional Design

AFDD: It uses advanced technology to spot arc faults. These faults can happen in damaged wires or loose connections. It has high breaking capacity (up to 6kA for SINGI’s AFDD). It also has a long electrical life (over 3000 times on average). It is designed to prevent fires first.

RCBO: It combines residual current protection and overcurrent protection. It trips quickly when leakage current exceeds safe levels. It also reacts to too much current from overloaded devices or short circuits. Its design prioritizes shock prevention and circuit overload safety.

In short, AFDD and RCBO complement each other. AFDD is essential for stopping fire-causing arc faults. RCBO focuses on electric shocks and overcurrent. For comprehensive safety, many systems use both. If you need arc fault protection, AFDD is the right choice. SINGI’s AFDD meets global standards like CB, CE and UKCA. It is a reliable option for homes and businesses alike.