For rural lighting electrical Ready Board Box in Africa, equipped with miniature circuit breakers （MCBs) that comply with the IEC 60898-1 standard (commonly used for Eskom projects), with a rated current of ≤ 63A for lighting micro breaks. Under overload conditions of 1.45 times the rated current, the thermal trip action time should be within 60 minutes (1 hour); 1.13 times the rated current, tripping is not allowed within 1 hour to avoid tripping by mistake due to slight load fluctuation.

This lighting electrical ready board is mainly used for lighting lines in remote villages, where the environment is high temperature, dusty, prone to condensation, and the cable section is small, posing a prominent fire risk. Therefore, the anti time limit characteristics of thermal trip must be strictly controlled. The higher the overload factor, the faster the action. For example, a 2.55In overload can trip within 1-60 seconds to promptly suppress cable temperature rise. When selecting, give priority to C-type curve micro breakage, adapt to lighting loads, and balance anti starting impact and overload protection.

When the on-site ambient temperature is higher than the standard reference temperature of 30 ℃, the bimetallic strip will be heated in advance, and the actual tripping time will be shortened. The design and factory testing need to reserve a temperature reduction margin. At the same time, it is necessary to distinguish between thermal trip overload long delay and magnetic trip short circuit instantaneous protection. Short circuit faults rely on electromagnetic mechanisms to quickly disconnect, and are not confused with thermal trip time indicators. This indicator is also a mandatory test item for Eskom's type testing and arrival inspection, ensuring that when rural lighting lines are overloaded for a long time, the power supply can be reliably cut off within 60 minutes, preventing insulation aging and fire, and ensuring the safety of electricity use in remote areas.