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RCBOs

RCBOs, or Residual Current Breakers with Overcurrent protection, are advanced electrical safety devices designed to protect individual circuits from earth leakage faults and overcurrent conditions. By combining the functions of an RCD and an MCB into a single compact unit, an RCBO breaker delivers comprehensive protection while improving fault isolation. This makes RCBOs especially suitable for modern electrical installations where safety, space efficiency and system reliability are essential.

At RS Hong Kong, customers can buy RCBO products for residential, commercial and industrial use. From RCBO Type A and Type B to other specialist variants, RS supports professionals across Hong Kong with quality, standards-compliant solutions.

How RCBOs Work

An RCBO works by continuously monitoring the current flowing through the live and neutral conductors of a circuit. If an imbalance is detected, indicating earth leakage, the RCBO switch trips immediately to cut power and prevent electric shock. At the same time, the device responds to overloads and short circuits by interrupting the current before cables or equipment can overheat.

Because each RCBO protects a single circuit, faults are isolated efficiently without affecting other circuits. This dual-protection mechanism improves both personal safety and system reliability.

Benefits of RCBOs

RCBOs bring many benefits to various use applications. These include:

Enhanced Safety: Protects against electric shock, fire hazards and equipment damage caused by leakage or overcurrent faults.
Single-Circuit Protection: Each RCBO breaker protects one circuit, making fault finding easier and reducing downtime.
Compact Solution: Combines RCD and MCB functions in one unit, saving space in distribution boards and simplifying wiring.

Common Types of RCBOs

There are several different types of RCBOs adapted for different use cases. The most common ones include:

Type A RCBOs: Detect alternating current and pulsating DC leakage. Commonly used in residential and commercial circuits with electronic appliances and lighting.
Type F RCBOs: Designed for single-phase inverter and variable-speed drive applications, offering improved resistance to nuisance tripping.
Type B RCBOs: Detect AC, pulsating DC and smooth DC leakage. Essential for EV chargers, solar inverters and industrial power electronics.
Type S RCBOs: These time-delayed devices are used mainly for discrimination in coordinated protection systems, reducing unnecessary tripping.

Applications of RCBOs

RCBOs are used across a wide variety of spaces in Hong Kong, including:

Homes and Offices: Residential RCBOs protect lighting, socket outlets and household appliances.
Commercial Buildings: Used in offices, retail spaces and mixed-use developments to improve safety and continuity.
Industrial Facilities: Installed in machinery circuits and control panels to protect equipment and personnel.
High-Risk Locations: Suitable for wet areas, outdoor installations and environments with higher shock or fire risk.

How to Choose the Right RCBOs

Choosing the right RCBOs comes down to individual application. Consider the following factors:

Current Rating: Select a rating that matches the circuit load to avoid nuisance tripping or overheating.
Tripping Curve: Choose the correct characteristic depending on application needs, such as RCBO Type A or RCBO Type B.
Pole Configurations: Ensure the RCBO matches local wiring practices, whether single-pole or double-pole configurations are required.

Why Choose RS for RCBOs

RS is a trusted RCBO supplier in Hong Kong, supporting electricians, contractors and facility managers with reliable circuit protection products. Our catalogue includes RCBO breakers from globally recognised brands such as Schneider Electric, ABB and Siemens. Customers can easily compare RCBO circuit breaker price, RCBO switch price and technical specifications before purchasing.

In addition to RCBOs, you can also find circuit trips, electronic circuit breakers and RCCBs in our online shop, making it easy to complete your industrial setup. For more details on lead times, delivery options and ordering procedures, please feel free to refer to our delivery page.