LR4-380F

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PTC (positive temperature coefficient) resettable fuses are widely used in industrial applications such as mechanical and electrical equipment, medical devices, consumer electronics, automotive, and several other products. The LR4-380F is a type of PTC resettable fuse consisting of a metallic composite material with a predetermined temperature coefficient of resistance. Utilizing the characteristics of the material’s temperature coefficient, the LR4-380F will increase its resistance when the current exceeds its rated current value. This causes the LR4-380F to automatically trip, and to reset itself after the current is reduced. It is an inexpensive solution for many electrical circuit protection needs.

The LR4-380F PTC resettable fuse features a rated voltage of 315VAC and a rated current of 10A. The maximum diameter of the LR4-380F is 18mm, and the set current rating is 380mA. The break time at 10A is 120 seconds, and the resettable time is 8 seconds at 200mA. This fuse is incredibly temperature sensitive, so its maximum rated operating temperature is 85°C.

The LR4-380F PTC resettable fuse is often used in a variety applications, including over-current protection for electrical circuits, automotive circuit protection applications, home appliance protection, consumer electronics and charger/adapter protection, communication line surge absorbers and switching power supply over-current protection, as well as in medical equipment. It is an ideal solution for places where continuous current flow is required, and it is usually designed to prevent further damage from short circuits, overloads, or surges in electrical charge.

The principle of the LR4-380F PTC resettable fuse follows the same principle as a normal fuse. When the current passes through the fuse, metallic composition inside is heated up and its resistance will increase gradually. When the resistance value reaches the predetermined threshold, the fuse turns off the current and breaks the circuit. The resetting of the circuit occurs when the current is reduced, allowing the metallic composition to cool, and the resistance will decrease back to its nominal value. The resetting time depends on the size of the device and the tolerance of the resistance.

The LR4-380F PTC resettable fuse is designed to provide robust and reliable protection against short circuits, overloads, or surges as well as superior temperature stability. This PTC resettable fuse comes with a UL approval rating, as well as a minimum 6300 cycles/1000 hours endurance guarantee, making it one of the most reliable and durable resettable fuses on the market.

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