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Protection device

Protection Device

  • The overcurrent protection components used in electronic devices mainly include ordinary fuses, thermal fuses, self recovery fuses, and fuse resistors (protective resistors). They are generally connected in series in the circuit. When abnormal phenomena such as overcurrent or overheating occur in the circuit, the circuit will be immediately cut off to play a protective role, in order to prevent further expansion of the fault. Overvoltage protection devices mainly include varistors, overvoltage protection diodes, etc., which are generally connected in parallel in circuits.

Detail

Ordinary fuse

Ordinary fuses belong to the type of fuses that cannot be restored after melting, and play a role in short circuit protection in the circuit. After melting, only replace the fuse with a new one. It is represented by the letter symbol "F" or "FU" in the circuit.


Thermal fuse

Thermal fuses are also a type of non recoverable overheat protection element, widely used in various electronic products such as electric cookware, motors, power transformers, etc. for over temperature protection.


Self recovery fuse

A self recovery fuse is a current limiting protective element with functions of overcurrent and overheating protection, and can be reused multiple times, also known as a thermal protector.


When faults such as overload or short circuit occur in the low-voltage power supply line, the protective electrical components (such as low-voltage circuit breakers, fuses, and thermal relays) in the low-voltage power supply line will act, causing the circuit to be cut off to protect the power supply line, power equipment, and electrical equipment from burning out due to overload or short circuit faults