MF-USMF035-2 Circuit Protection

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PTC Resettable Fuses

PTC (Positive Temperature Coefficient) Resettable Fuses are made of polymeric materials that allow a fuse to limit the current through a circuit automatically under fault and overcurrent conditions while functioning as a circuit protector. The MF-USMF035-2 is a sub-category of PTC resettable fuse and it is popular for its performance, reliability, and cost. This article discusses the MF-USMF035-2’s application fields and working principle.

Application Fields

The application field of MF-USMF035-2 includes a broad range of electronic products and power supplies. It is made for protecting circuits from overcurrent conditions caused by a fault or a short circuit. It can be used in both AC and DC circuits, where it is important to limit the overcurrent to a certain level. Its uses include protection for computers, telecommunications equipment, digital cameras, printers, copiers, AC and DC supplies, solar products and other electronic devices.

It is also suitable for appliance and medical equipment, where electricity is highly sensitive and needs to be regulated correctly. Another important application of the MF-USMF035-2 is in the protection of electrical power systems, such as emergency lighting, building and fire alarm systems. Its compact size and relatively low cost makes it one of the preferred option for these applications.

Working Principle

The MF-USMF035-2 is a PTCF (positive-temperature coefficient fuse), which works on the principle of a thermistor. It includes a resin-encased thermistor plus a conductive trace. When the normal current is passing through the circuit, the temperature of the device is kept at a nominal level. When a sudden surge or overload occurs, the temperature of the device rises, rupturing the fuse element and interrupting the current in the protected wire.

At this stage, the conductor trace becomes open, and the device begins building a heat memory, which ensure that even when the fault condition is removed, it will remain open until it cools off and reset. It is important to note that the device does not restart until it is manually reset. This makes the MF-USMF035-2 ideal for applications where an immediate reset of the fuse is not necessary.

In summary, the MF-USMF035-2 is a sub-category of PTC resettable fuse that is suitable for a range of applications like protecting circuits from overcurrent conditions and regulating sensitive electricity in appliance and medical equipment. It is designed on the principle of a thermistor, where a temperature rise caused by overcurrent, rupture the fuse and interrupt the current on the protected wire. It will then remain open until manually reset.

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