VLR170UL-C30F

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PTC Resettable Fuses, commonly known as PPTC (Polymeric Positive Temperature Coefficient) are devices that were developed to offer an alternative or a combination solution of protection and circuit control. With the advances in technology, they are increasingly being used in a wide variety of applications ranging from consumer electronics to industrial equipment and renewable energy sources.

VLR170UL-C30F is a polymeric Positive Temperature Coefficient (PPTC) device used for circuit protection. It is a nonlinear resistor which exhibits a rapid increase resistance with increase in temperature. VLR170UL-C30F has a broad range of operating current and voltage capabilities. It is available in several different configurations of current ratings ranging from 0.2 A to 20 A with different Maximum Operating Voltages (MOVs).

The VLR170UL-C30F is typically used to protect from load short circuit conditions, as in the case of wiring shock protection. It could also be used to protect a circuit from over voltage conditions, such as in transformer-based power supplies. In addition, it is used for some automotive applications including battery protection.

The VLR170UL-C30F application field consists of Class 2 priority circuits, such as audio circuits and control circuits. It is designed for secondary protection in electrical appliances to protect against electric shock hazard; and its compact size enables it to be bundled with the appliance’s main power transformer for improved product reliability.

The working principle of the VLR170UL-C30F is based on the positive temperature coefficient principle. When the circuit is normal, the device maintains a low internal resistance, allowing current to pass through it. When an over current or over voltage occurs, the device’s resistance will increase to trip the circuit and separate the load from the power source. When the thermal overload is removed, the PPTC will cool to its normal state and the current flow is restored.

The VLR170UL-C30F also features a dual-velocity response time for superior reliability and fast response times. This two-stage response time provides faster protection for short-duration overloads, while providing protection against longer-duration overloads as well. This makes the VLR170UL-C30F an ideal solution for providing stress-free secondary circuit protection in applications where fast response times are critical.

In summary, the VLR170UL-C30F is a compact, reliable, and fast-acting PPTC device which can be used for a variety of applications, such as wiring shock protection, transformer-based power supplies, battery protection, and other Class 2 priority circuits.

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