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FUS Standard Leakage Plug Circuit Board Assembly
Product Overview
FUS standard leakage plug circuit board assembly are key components in protecting people and equipment from the hazards of residual current. Commonly known as residual current protection plugs, this sophisticated device plays a vital role in detecting leakage current in a circuit. When a fault is detected, it quickly cuts off the power supply, thereby preventing potential electric shocks and reducing the risk of fire associated with electrical faults. The core protection mechanism of the US standard leakage plug circuit board assembly is its ability to monitor the balance between the live and neutral currents.
Core protection mechanism
1. Current imbalance detection
The current vector difference between the live wire (L) and the neutral wire (N) is monitored in real time through the zero-sequence current transformer, and a response is triggered when leakage causes a current difference (i.e., residual current 𝐼Δ).
2. Rapid power-off protection
Action threshold: ≤30mA (based on the safety limit of human ventricular fibrillation);
Response time: ≤0.1 seconds, ensuring that the shock energy does not exceed the critical value of 50mA·s.
3. Trip execution
The electromagnetic tripping mechanism cuts off the power supply within 0.1 seconds, and no external power supply is required.
Additional safety features
1. High temperature flame retardant protection
High-end models use V0-grade flame-retardant material casing to suppress arc fires, and some products have an additional 300-500mA fire protection level to monitor continuous leakage caused by insulation aging.
2. Self-check and reliability assurance
·Press the test button (T button) every month to simulate 75mA leakage current to verify the tripping function;
·Intelligent models support circuit self-diagnosis and trigger fault indicator lights when abnormalities occur;
·Pass 70℃ high temperature and humidity cycle test to ensure stability.
