RUEF110

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PTC (Positive Temperature Coefficient) Resettable Fuses are an essential design element in many consumer and commercial products. Traditional resettable fuses require manual resetting in the event of an overload or short circuit – not something that is practical in today’s electronic products. The RUEF110 appliance field and working principle, provides a unique solution to this problem – an automatic reset function that eliminates the need for manual intervention.

The RUEF110 offers a resettable (thermally activated) over-current protection circuit that requires no manual resetting, yet provides higher current ratings than traditional, non-resettable fuses. This resettable fuse utilizes a precision, heat sensitive polymeric film element that is hermetically sealed and moisture-proofed to create a powerful circuit protection device. In the event of an over-current situation, the fuse provides protection by automatically “tripping” (i.e. opening the circuit) within the specified current and temperature window. The trip time is closely controlled to prevent any adverse system effects during the thermal protection event. The device will then reset automatically (i.e. close the circuit) after it has cooled to a safe temperature.

The RUEF110 operation and application works on the principle of a positive temperature coefficient. When the current exceeds the set rated value, the temperature of the polymeric element will increase rapidly and cut off the connection. Once the polymeric element cools to a certain temperature the fuse is “reset” and the connection is restored. This resettable function allows for repeated protection, which makes the device ideal for applications that are subject to intermittent overloads.

The heat sensitive element of the RUEF110 is also cooled by the heat sink that is incorporated on the device to increase the thermal stability. This ensures that the device does not reset when exposed to trivial temperature changes from the environmental conditions. The RUEF110 is also UL certified, and has been tested to conform to the CSA and VDE safety standards. The UL listed RUEF110 can be safely put in two or more series to protect circuits from larger current surges.

In summary, the RUEF110 provides an ideal solution for the protection of electronic circuits, when compared to other traditional fuses. It does this by offering a resettable fuse which automatically opens the circuit upon detection of an overload or short circuit and resets the circuit once it cools to a safe temperature. The device is operating on the principle of a positive temperature coefficient and is UL certified, making it a highly reliable alternative to manual resettable fuses.

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