MICROSMD075F-2

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PTC Resettable Fuses are a type of overcurrent protection device that are widely used in consumer, automotive, and industrial markets. The MICROSMD075F-2 is an example of a PTC Resettable Fuse, and this article will discuss its application field and working principle.

PTC Resettable Fuses are comprised of a cylindrical body, two conductive end caps and a dielectric core. The core of the fuse is made from a specially formulated PTC thermistor material that is sensitive to currents of excessive magnitude. When the current flowing through the device exceeds it’s preset rating, the PTC thermistor in the fuse will heat up and cause a current surge or “trip” which will interrupt the current flow. This action will also lower the resistance of the device, creating an open circuit.

The MICROSMD075F-2 is a convenient and cost-effective solution to provide overcurrent protection in a compact and lightweight package and is ideal for applications where size and weight are critical factors. This particular PTC fuse is designed to meet the more stringent over-current protection requirements found in many applications. It also carries numerous certifications, including UL, CSA, CE, EN 60884-1, and TUV.

The MICROSMD075F-2 is rated from 0.75 to 3.15A, with trip currents ranging between 1.1A and 6.30A. It features an interrupting capacity of up to 250A @ 120VAC/148VDC, and a maximum voltage rating of 600VAC/VDC. It operates over a temperature range of -30 – +125°C, with a maximum operating temperature of +85°C. The fuse is constructed with a 7mm diameter body and is rated for up to 5000MΩ at 500VDC insulation resistance.

The working principle of the MICROSMD075F-2 PTC Resettable Fuse is simple yet effective. When an overcurrent condition occurs, the internal PTC thermistor heats up and becomes highly resistant. This causes the current flowing through the fuse to be restricted, creating an open circuit. Some energy will be dissipated as heat during the tripping process, and when the current is reduced to a safe level, the thermistor will return to its normal conductive state and reset the device.

The MICROSMD075F-2 PTC Resettable Fuse is widely used in various applications, such as automotive electronics, consumer electronics, telecommunications equipment, industrial equipment, motors, power supplies, and more. Because the fuse is self-restoring and does not require replacement after an overcurrent condition, it is an ideal solution for cost-sensitive electronics. The MICROSMD075F-2 is also a reliable, low-profile option for a wide variety of applications.

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