In the building electrical system, the lighting electrical ready board is a key hub for energy distribution and safety protection, and the combination of residual current devices (RCBOs) and circuit breakers constitutes the core safety line to resist electrical risks, providing dual protection for lighting systems in residential, commercial, and industrial scenarios.

As the "overload and short-circuit protector" of the circuit, the circuit breaker bears the responsibility of basic protection. When the lighting circuit is overloaded due to excessive load, or short circuited due to aging or improper wiring, the circuit breaker will quickly detect abnormal current and instantly cut off the circuit through electromagnetic or thermal tripping mechanisms to avoid overheating and burning of the circuit, which may cause a fire. Its rated current and breaking capacity need to be accurately matched according to the load characteristics of the lighting circuit to ensure rapid response and reliable action in the event of a fault, preventing the accident from escalating.

RCBO focuses on "personal electric shock protection" and fills the gap in leakage protection for circuit breakers. In lighting systems, damage to lighting fixtures, aging of circuit insulation layers, and other conditions may cause electrical leakage. At this time, the current will flow through the human body or equipment casing to the ground, forming residual current. RCBO can accurately detect this small current difference (usually operating current ≤ 30mA), quickly trip and cut off the power supply within tens of milliseconds, fundamentally avoiding the occurrence of personal electric shock accidents. Compared with simple circuit breakers, RCBO has triple protection functions of overload, short circuit, and leakage, and is the core component in lighting electrical ready boards to ensure personal safety.

The two work together to build a "dual protection system": circuit breakers are responsible for dealing with "explicit faults" such as line overload and short circuits, while RCBOs protect personal safety and prevent "implicit risks" such as leakage. In practical applications, this combination is widely applicable to lighting circuits in various places such as residential buildings, office buildings, and shopping malls. Whether it is ordinary lighting fixtures or embedded and outdoor lighting equipment, it can achieve full scene safety coverage through this defense line.

The safety performance of lighting electrical ready boards is directly related to the stability and safety of the electrical environment. The scientific combination of RCBO and circuit breakers not only meets the mandatory requirements of electrical specifications, but also eliminates most electrical safety hazards from a technical perspective, becoming an indispensable safety cornerstone in modern building electrical systems.