RUSBF155-AP Circuit Protection

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PTC Resettable Fuses are a type of fuse which allow for multiple current interruptions without permanently being opened or needing replacement. The RUSBF155-AP is a type of PTC Resettable Fuses which is specially designed for DC and AC current applications. It has the ability to interrupt a fault current from 0.15A to 15A. It is used for electronic equipment protection, circuit safety, and power equipment control.

The most common application of RUSBF155-AP is as an overcurrent protection device, providing protection against overvoltage or short circuit conditions. This type of fuse is ideal for protecting inrush circuits which experience large transient surge currents when the load is activated. The overcurrent protection feature prevents the equipment from experiencing damage during transient peak current conditions.

The working principle of RUSBF155-AP is based on the use of a Negative Temperature Coefficient (NTC) thermistor. The thermistor is inversely proportional to temperature, which means that when the temperature increases, the resistance of the thermistor decreases. When current flows through the fuse, the thermistor heats up, lowering its resistance and allowing the current to flow freely. However, when the current exceeds the preset thermal threshold, the thermistor heats up even more rapidly. This causes the resistance of the thermistor to increase rapidly, thus blocking the current flow and protecting the equipment.

The RUSBF155-AP has a Response Time of 41ms at 2xIrated AC, and has a wide variety of options available including RoHS compliant, lead-free, and can be provided in bulk or in tape & reel packaging. It also has an operating temperature range of -55°C to 125°C and is available with a variety of mounting options.

In conclusion, the RUSBF155-AP is a versatile PTC resettable fuse which is ideal for overcurrent protection and for providing reliable circuit protection. It is ideal for DC and AC current applications, and can be easily incorporated into existing designs with little modification. The thermistor-based design of the RUSBF155-AP ensures reliable and predictable protection against overvoltage or short circuit conditions.

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