SRP420

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PTC Resettable Fuses

A PTC Resettable Fuse, otherwise known as PolySwitch, polyfuse, or self-resetting fuse, is an electronic, over-current protection device. It is designed as an alternative to traditional fuses. Unlike regular fuses, PTC Resettable Fuses are self-resetting rather than being replaced after each fault, making them ideal for applications where downtime needs to be kept to a minimum.The SRP420 is a PTC Resettable Fuse manufactured by Polyswitch. It is available in various current ratings and offers over-current protection up to 420VAC.

Application Field and Working Principle of the SRP420

The SRP420 is an ideal solution for a variety of AC applications, including power tools, air conditioners, control panels, and other devices with similar needs. It can be used as a primary fuse or as a supplemental device. Its low temperature rise and high current limit make it suitable for high-current, high-voltage applications.

The SRP420 works by sensing current and triggering a built-in circuit breaker. When the current exceeds the set level, the SRP420 circuit breaker trips and shuts off the power. After the power is shut off, the SRP420 will automatically reset itself when the current returns to a safe level. This protects the connected devices from damage caused by over-current.

In addition to superior over-current protection, the SRP420 also offers superior surge protection. The device can withstand a surge up to 42A continuous, 40A peak for up to 300ms, making it ideal for applications that require surge protection.

The SRP420 also features a thermal shut-off mechanism which triggers when the operating temperature exceeds its safe level, protecting it from overheating. Additionally, it has an internal resistance which acts to limit the size of any inrush current surges.

Overall, the SRP420 is a reliable and versatile PTC Resettable Fuse that offers superior protection for AC applications.

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