FP225 Circuit Protection

Electrical, Specialty Fuses

Fuses are devices used in electrical circuits to protect against hazardous conditions such as load overloads, short circuits, or transformer failure. Specialty fuses are designed for specific applications and are identified by their ampere ratings. One of the most popular specialty fuses is the FP225.

Application Field

The FP225 is a high current, mid-range fuse that is suitable for a wide range of applications, including circuit protection in commercial, industrial, and residential locations. It is commonly used in protection panels, in-line distribution and junction boxes, and in motor starters. This fuse is also commonly used to provide protection for large automotive systems, such as starters, alternators, dynamos, and similar components.The FP225 is available in both 15 amp and 25 amp versions, which are suitable for use with medium-voltage and high-voltage electrical systems. It is designed to operate at higher temperatures, up to 175°C, and can be used in both indoor and outdoor applications. It is UL listed and meets international standards for shock and arc-fault protection.

Working Principle

Fuse operation is based on the principle of current overload. When too much current passes through the fuse, the temperature inside the fuse rises, causing a thin layer of metal, known as the fusible element, to melt. This melting releases a spring-loaded plunger that reacts against a contact, breaking the circuit. The fusible element can be made of a variety of materials, including silver, copper, tin, or zinc. Silver is the most commonly used because it has the highest melting temperature.In the case of the FP225 fuse, the fusible element is made of silver, which has a melting temperature of 2,000°C. As the current rises, the temperature inside the fuse rises until the silver element melts, releasing the plunger and breaking the circuit. The FP225 also has a thermal fuse, which will stop it from operating at temperatures above 175°C.

Conclusions

The FP225 fuse is a high-current, mid-range fuse that is suitable for a wide range of applications. It is UL listed and meets international standards for shock and arc-fault protection. The fusible element is made of silver, which has a high melting temperature, and the fuse includes a thermal fuse to protect it from temperatures above 175°C. This makes the FP225 a reliable and dependable choice for all types of circuit protection.