What does 'press once a month' on the residual current device mean?
2 Answers
The function of the 'press once a month' button on the residual current device is to test whether the device is working properly. Here is some extended information about automotive leakage: 1. Types: (1) Battery depletion caused by unswitched electrical appliances when the car is parked. (2) Battery depletion due to self-discharge caused by short circuits or oxidation and shedding of the battery plates. (3) Leakage caused by grounding of automotive electrical appliances, wiring harnesses, sensors, controllers, actuators, and other electronic components and circuits. 2. Dark current: Dark current refers to the current that still flows when the ignition switch is in the OFF position (when the car is not in operation). It is because of the existence of these dark currents, as well as the natural discharge of the battery, that the battery capacity becomes insufficient when the vehicle is parked for a long time, leading to the car's inability to start.
Pressing the test button on this leakage protection device once a month is actually to ensure it can promptly cut off the power in case of leakage, preventing electric shock risks. This practice is common in household appliances or certain vehicle electrical systems, such as the high-voltage battery protection devices in electric vehicles. Why once a month? Because dust, aging, or contact oxidation inside the protector may cause it to malfunction, and regular testing helps identify issues in advance. As a car owner, I recommend making this a habit, especially during rainy seasons or in humid environments where the risk of leakage is higher. If the button doesn't respond when pressed during a test, it means the protector has failed and needs immediate replacement or inspection by a professional. Ignoring this issue could lead to battery burnout or even fire in case of a leakage short circuit while driving, which is extremely dangerous. In summary, this small monthly action ensures both your safety and your vehicle's safety—it's practical and simple.
