VLR170UF

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PTC Resettable Fuses

PTC (positive temperature coefficient) resettable fuses, or polymeric positive temperature coefficient (PPTC) fuses, are a type of fuse with the ability to reset and recharge itself when the over-current condition is removed. Unlike traditional fuses, PTC resettable fuses do not require replacement. Instead, they are designed to reset itself after the power has cooled down, making them cost effective and preferred in applications that need frequent resetting. PTC resettable fuses are widely used in a variety of safety and protection applications, including automotive, aerospace, datacenter, consumer electronics, medical, industrial, and many more.

The VLR170UF is a popular PTC resettable fuse from Littelfuse. This component features a power rating of 170V, a response time of 2-6 milliseconds, a nominal operating temperature range of -56°C to 85°C, and a nominal current rating of 16 A. The VLR170UF is a member of the FuseSecure series, and it has a compact design that is suitable for use in many applications.

The VLR170UF can be used in numerous applications, including consumer electronics, telecommunications, automation, and medical equipment. Additionally, the VLR170UF is also suitable for use in automotive, aerospace, alternative energy, and security applications. Such applications may include LED lighting, automotive power systems, power backup systems, and HVAC. Additionally, it can also be used in applications that require overload and short circuit protection.

The VLR170UF is designed to protect circuits from damage caused by over-current conditions and surges. It has an integrated self-reset feature, which allows it to detect an over-current condition and then disable the current until the fault condition is removed. The VLR170UF is also capable of sensing and tripping at very early stages of an overload, which prevents the device from becoming damaged due to excessive current flow.

When it comes to the working principle of the VLR170UF, it operates by utilizing a PTC element. This element is made of a special polymer material and includes an intricate matrix of conductors. When an overload or surge is detected, the PTC element heats up and the conductors expand, causing the current to decrease until the fault condition is removed. Once the fault has cleared, the PTC element cools down and the conductors reset back to their original state, allowing the device to reset itself.

In conclusion, the VLR170UF is a popular PTC resettable fuse from Littelfuse, suitable for a wide range of applications. Its integrated self-reset feature allows it to detect an over-current condition and then disable the current until the fault condition is removed. Additionally, the VLR170UF is capable of sensing and tripping at early stages of an overload, which prevents the device from becoming damaged due to excessive current flow. Its working principle relies on the use of a PTC element made of a special polymer material with an intricate matrix of conductors.

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