plastic fuse box regulations

　　Characteristics of PPTC fuses

　　1. High power-off capability: PPTC fuses can provide high power-off capability in a small volume. They can withstand high currents, ensuring the normal operation of the circuit while protecting it.

　　2. Low voltage drop: PPTC fuses have the characteristic of low voltage drop and will not cause energy loss under normal working conditions.

　　3. Wide working temperature range: PPTC fuses can work normally in a wide temperature range and adapt to the needs of different environments.

　　Disadvantages of PPTC fuses

　　1. High internal resistance: Due to the self recovery characteristics of PPTC fuses, their internal resistance will significantly increase in the protected state. This may have a certain impact on the performance of the circuit, especially in applications that require low resistance.

　　2. Trigger time delay: Although PPTC fuses have a relatively fast response time, their trigger time may be delayed compared to traditional fuses. In applications where rapid protection of circuits and equipment is crucial, delay in triggering time may become a problem.

　　3. Steady state power loss: Under overload conditions, PPTC fuses will generate certain power losses, which may cause the temperature of the equipment to rise and reduce its efficiency.

　　Summary of knowledge points on self-healing fuses

　　Self recovery fuse is named after a relatively traditional one-time blown fuse. The function also serves as a fuse in the circuit, but it can be restored by itself after protection, and can be repeatedly protected without the need for disassembly and replacement.

　　The self recovery referred to here refers to the protection activated by the self recovery fuse when an abnormally high current occurs in the circuit. When the protection is activated, the current in the circuit is not completely interrupted, but instantly decreases to a very weak small current. At this time, the equipment on the circuit will stop working. After manually disconnecting the power and troubleshooting, when the power is restored, the self restoring fuse will automatically return to its pre protection state without the need to replace the fuse, and the circuit can resume normal operation. If the fault is not resolved, or if the fault occurs again, the

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