The switch configuration in the small power distribution unit is usually designed according to the needs of the electrical system to ensure the safe supply and reasonable distribution of electrical energy. A typical small power distribution unit contains components such as main circuit breakers, branch circuit breakers, and residual current devices (RCDs).

Main circuit breaker: Used to cut off the power supply of the entire electrical system. It is the main switch of the circuit and is used to quickly cut off the power supply in emergency situations.

Shunt circuit breaker: Divides an electrical system into different circuits, each with an independent circuit breaker for individual control and protection. For example, lighting circuits, socket circuits, etc.

Residual current protector (RCD): Used to detect current leakage. Once the detected current leakage exceeds the safety threshold, the RCD will quickly cut off the power supply to prevent electric shock accidents.

Configuring these switches requires reasonable planning based on electrical loads and uses to ensure that each circuit works independently and faults are isolated, while meeting safety and convenience requirements. It is recommended that professional electrical engineers carry out detailed design and configuration based on actual conditions.