2920L075DR Circuit Protection

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PTC Resettable Fuses are widely used in various types of electronic circuitry where a sensitive circuit must be protected from potentially harmful levels of electric current. The 2920L075DR application field and working principle is similar to other general-purpose PTCs, and serve the same purpose in over-current protection applications.

The 2920L075DR offers current protection up to 75 Amps and is designed for use in power systems with operating voltage up to 500 Volts. It has a wide range of applications including: automotive and industrial electric systems, motor control, DC/DC converting, photovoltaic systems, LED lighting, medical equipment and telecommunications systems. The 2920L075DR is designed to protect the equipment from over-current, over-temperature, and short-circuit current when properly mounted in the form of a “bulb” on a flat surface.

The working principle of the 2920L075DR is based on the principle of a PTC (Positive Temperature Coefficient) Resettable Fuse. A PTC fuse is a self-interrupting fuse that automatically cycles on and off through a process known as pulsing. A PTC fuse comprises a plastic body filled with a special polymer blend. As the electric current passes through the circuit, the temperature of the PTC fuse will gradually increase, resulting in the fuse tripping and breaking the circuit connection. This disconnects the electric current from the circuit, allowing the PTC fuse to cool down and reset. Once the temperature of the PTC fuse drop below the tripping point, the fuse will reset and the circuit is reconnected.

The 2920L075DR also incorporates a number of features to improve its performance. These include a low-temperature coefficient, wide operating temperature range, high current capacitance, fast response time, low contact resistance and improved spike protection. To ensure the highest level of safety, all connecting leads must be properly gripped and the unit secured correctly in place.

The 2920L075DR is a reliable and cost effective solution for the protection of sensitive electronic circuitry. It has been designed to withstand the harsh environment conditions often encountered in power electronics and provides a reliable solution for over-current protection. The fuse is UL-listed and offers the best in class current protection with a fast, reliable and economical reset response.

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