A Surge Protection Device (SPD) is a safety component designed specifically to protect electrical equipment from voltage spikes or “surges.” These surges can be caused by lightning strikes (direct or indirect) or internal sources like the switching on/off of large appliances (e.g., air conditioners).

A voltage protector is an electrical device that monitors circuit voltage. It cuts off power when voltage is too high/low, protecting electrical equipment from damage.

A modular distribution box, often called a circuit breaker panel or consumer unit, is the central hub that controls and distributes electricity throughout your home. The key feature is “modular” – it has a rail system inside that allows you to easily snap in different modular electrical components like circuit breakers (MCBs), leakage protectors (RCDs/RCBOs), and isolator switches.

Unlike RCCB (only residual current protection), RCBO adds overcurrent protection.Unlike MCB (only overcurrent protection), RCBO adds residual current protection. It is a “2-in-1” integrated device.

For a more detailed explanation, please read<RCCB VS RCBO>.

It works by monitoring the current difference between the live wire and neutral wire. Under normal conditions, the two currents are equal. When leakage occurs, part of the current flows to the ground, creating a current difference. The RCCB detects this difference and triggers the tripping mechanism to cut off the power immediately.

A residual current circuit breaker (RCCB) is an electrical protection device. Its main function is to detect the residual current (leakage current) in the circuit and quickly cut off the power supply, thereby preventing electric shock accidents and fire hazards caused by leakage.

A miniature circuit breaker (MCB) is a small-sized low-voltage circuit protection device. Its main role is to automatically cut off the circuit when overcurrent or short circuit occurs, protecting electrical equipment and preventing electrical fires.

A miniature circuit breaker primarily prevents circuit overloads and short circuits; a residual current device specifically detects leakage currents to prevent electric shock hazards. Modern homes typically combine both (using an RCBO or installing an RCD at the main switch) to provide comprehensive protection.

It is widely installed in residential electrical systems, such as distribution boxes in homes, to protect household electricity safety.

It is also used in industrial and commercial places, such as workshops, shopping malls, and office buildings, especially in circuits connected to electrical equipment that is easily touched by humans.