PTGL7SARR47M1B51A0

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PTC resettable fuses, also known as polymeric positive temperature coefficient (PPTC) are self-resetting fuses that protect electrical circuits from over-current and short-circuit events. They are temperature-sensing devices that are used as an alternative to other protective devices such as thermal-magnetic circuit breakers, fuses, and varistors. The PTC resettable fuses have many advantages, particularly for low-power, low-cost, mass-produced, and safety-sensitive portable devices.

In comparison with other protective devices, the PTC resettable fuses offer a cost-effective and efficient way to protect circuits from overload and short circuits. The PTC resettable fuses operate in a similar manner as conventional thermal-magnetic circuit breakers by tripping the circuit when the current exceeds a predetermined threshold. However, unlike traditional circuit breakers, the fuse does not require manual resetting after tripping—it will reset automatically when the circuit is cooled.

The PTGL7SARR47M1B51A0 resettable fuse is designed to respond to a maximum of 4,700mA of current in 1-2 seconds and then automatically reset after the current is reduced below the predetermined threshold. This fuse is made of a polymeric material and is capable of withstanding temperatures up to 85°C. The PTGL7SARR47M1B51A0 resettable fuse offers excellent electrical stability, high current-carrying capacity, and superior thermal stability. It is designed to provide fast over-current protection and robust fault recovery capabilities.

The working principle of the PTGL7SARR47M1B51A0 resettable fuse is based on the phenomenon known as ‘positive temperature coefficient’ or PTC. When the current in a system exceeds the predetermined threshold, the PTC fuse will heat up due to an increased current level and the resistance of the polymeric material will also increase. This increase in resistance produces a large voltage drop across the fuse which will cause it to trip and interrupt the circuit. When the current falls below the predetermined threshold, the PTC fuse will cool down, the resistance of the polymeric material will decrease, and the fuse will reset automatically, allowing the circuit to operate again.

The PTGL7SARR47M1B51A0 resettable fuse is used in many applications such as consumer electronics, medical equipment, industrial machinery, and automotive systems. It offers an effective solution for protecting circuits and preventing damage caused by overload and short circuits due to its fast response time, high current-carrying capacity, and robust fault recovery capabilities.

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