Leakage circuit breakers should pay attention to the problem in use - Solutions - Huaqiang Electronic Network

Photocoupler

1. In the case of a leakage, the circuit breaker protects the switch through its internal mechanism, which is powered by the main circuit supply. Therefore, it's essential to connect the power supply according to the manual's instructions. Any incorrect wiring or leakage can lead to serious issues. Always double-check your connections and ensure proper grounding to avoid any potential hazards. 2. The leakage protection function of the circuit breaker has specific operational conditions. Overload, short-circuit, and leakage protection all have defined current thresholds. If the current or residual action current doesn't meet these requirements, the circuit breaker may not trip as expected. These tests are typically conducted using specialized equipment in the factory. Some users attempt to test the product by directly shorting the power supply or connecting cables to wet ground, which is both dangerous and ineffective. This method could result in accidents or damage to the device. It's strongly recommended to use only certified products from reputable brands that have passed national safety certifications like CCEE or CCC. If you don’t have access to professional testing equipment, it’s unnecessary to use unverified methods. Instead, simply press the test button to verify the circuit breaker's functionality. 3. Most leakage circuit breakers currently on the market are electronic models. According to national standards, when testing for power frequency withstand voltage or insulation resistance, the electronic components (such as the PCB) should be disconnected. If this step is skipped, high voltage during testing can damage the leakage protection function. A common symptom of such damage is the inability to close the circuit breaker after power is applied to the input side. 4. The incoming wiring of the leakage circuit breaker must be installed strictly according to the manufacturer's instructions. Never use the lower terminal for incoming lines. Doing so can cause the circuit breaker to fail during a fault, potentially leading to personal injury or property damage. Always follow the wiring diagram provided in the user manual and ensure all connections are secure and properly insulated.