RUSBF120

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PTC Resettable Fuses are electrical devices designed to provide protection against overload or short-circuits. They are a generic term for components that contain a Polymeric Positive Temperature Coefficient (PPTC) thermistor. When the current passes through the device, the resistor’s resistance changes with increasing temperature. The increase in temperature is caused by electrical current through the device, and the increase in resistance restricts the current.

The RUSBF120 is a PTC Resettable Fuse, designed for high-reliability electronics applications. The RUSBF120 provides over-current protection in electronic systems and components without the need for additional circuitry. Its small size and low weight make it ideal for high-density, space-constrained applications.

The RUSBF120 is available in three amperage ratings: 1.0A, 2.0A, and 3.0A. It operates over a wide temperature range from -40° C to +125° C (-40°F to +257°F). It is fast-acting, with an interrupting current of 0.15A at 75°C. The device has a single wrapped element construction and a surface mount termination.

The working principle of the RUSBF120 is very simple. When the current reaching the device is too high, the device’s PTC thermistor will heat up due to the passage of current. As the thermistor heats up, its resistance increases and the current flow is reduced. This will reduce the temperature of the thermistor, and once the current is reduced to a safe level the thermistor will cool down and its resistance will return to its original state. The RUSBF120 is designed to do this repeatedly, providing reliable over-current protection.

The RUSBF120 is suitable for applications such as telecom and datacom systems, industrial power supplies, consumer electronics, PCs and peripherals, medical equipment, motor control, power supplies, and portable electronics. It is also ideal for applications that require compact, high-current protection devices. The surface-mount design of the device enables easy integration into existing consumer, commercial and industrial products.

The RUSBF120 is a reliable, cost-effective, and compact solution for protecting electronics from over-current and short-circuits. Its fast-acting nature and low maximum trip current makes it an ideal choice for high-reliability electronic applications. Its surface mount design makes it a perfect fit for space-constrained and high-density applications, while its wide operating temperature range ensures that it can perform reliably in harsh environments. All together, these features make the RUSBF120 an ideal choice for over-current protection in a variety of applications.

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