VLR175UF

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PTC resettable fuses are used in many different applications where their unique functionality is necessary. This type of fuse utilizes a polymeric material which serves two main functions: to open when a short circuit or overload occurs, and then reset itself when normal current levels are achieved. The VLR175UF from Bourns is a good example of this type of fuse.

The VLR175UF is an axial-leaded, one-time PTC thermistor fuse with a current rating of 175mA. It is made using a polycarbonate molded case which offers excellent dielectric strength and temperature resistance. It also features a cylindrical button construction that prevents any shorting of the pins and provides great physical protection of the fuse elements from outside shock or vibration.

The VLR175UF is designed to provide overcurrent protection for portable electronic devices and other circuit designs. The resettable fuse has an operating temperature range from -40°C to 85°C and is UL recognized with a maximum voltage rating of 6.3V. It is capable of holding a current up to 175mA, and still be able to reset itself after a surge or overload. The melt-away PTC materials that it’s constructed with helps to ensure that its temperature remains stable in the event of sudden power interruptions.

The working principle of the VLR175UF is simple and effective. When an overcurrent situation occurs, the resistance of the fuse increases rapidly, creating a very high level of heat which melts away the fuse materials thus preventing further current flow. Once the current is reduced, the resistance of the fuse decreases, allowing current to flow again and retaining the circuit in the operational state.

The VLR175UF is an affordable and easy to use resettable fuse which has many applications in low power circuits. With its axial lead design, temperature capability, and UL recognition, it is a reliable and effective choice for protecting your device from overcurrent or overloads. Additionally, the VLR175UF is designed with an internal permanent one-way release which ensures that if a short circuit or overload occurs, the fuse will remain open, so that any further current flows will automatically be blocked until the device is powered off and then reset.

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