VLR150ULAF

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PTC Resettable Fuses are utilized to protect electronics from over-current or over-voltage events. A Wide variety of PTC fuse products are available in order to meet the demanding requirements of different applications. The VLR150ULAF is a specialty resettable fuse designed for use in automotive applications. The VLR150ULAF offers a low resistance up to approximately 3 mΩ to ensure minimal impact on device power efficiency, along with a 300 VDC voltage rating ideal for automotive applications.

One of the most important features of the VLR150ULAF is its ability to self-reset after an overcurrent or over-voltage event. This protective mechanism helps protect downstream components that may be exposed to large concentrations of current, or unsafe voltages that would normally cause irreparable damage. Additionally, the VLR150ULAF’s self-resetting feature allows for the device to be utilized in applications where a traditional fuse is unsuitable, such as in a battery-powered device.

The VLR150ULAF is composed of a PTC (positive temperature coefficient) thermistor and two electrical leads. The thermistor is disposed between the two leads, where one side of the thermistor acts as the anode and the other serves as the cathode. It is a self-heating element that increases in resistance with an increase in temperature, providing the necessary response to over-current and over-voltage events.

When the current or voltage exceeds the thermistor’s rated maximum, the resistance of the thermistor increases dramatically, restrict the flow of current to a safe level, and causing the device to trip or open circuit. This sudden decrease in current leads to a rapid decrease in device temperature, allowing the thermistor to reset to its original resistance. After reset, the device is ready to operate again, ensuring that any downstream components are protected from over-current or over-voltage events.

The VLR150ULAF also offers a unique feature called “smart switch protection”. This feature helps provide additional protection against short-circuit events by deliberately inhibiting the current for a short period of time after reset. This prevents any surges that may be caused by rapid voltage changes and ensures downstream components are not exposed to dangerous levels of current.

In summary, the VLR150ULAF is a specialized resettable fuse designed for use in automotive applications. It is composed of a PTC thermistor and two leads, which allow for the device to reset after over-current or over-voltage events. The VLR150ULAF also offers “smart switch protection” which helps provide additional protection against short-circuit events. This product, and the protection it offers, is invaluable to ensuring the safety of downstream components.

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