MF-R135-AP

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PTC resettable fuses are a type of overcurrent protection device consisting of two main parts, a PTC element and an element holder. The most common ptc fuse is the MF-R135-AP, which is used to electrically protect PC boards, power cables, and consumer electronics.

The PTC element element is composed of a polymer and a metal conductor. The conductor is made of a specific material that has a low electrical resistance when current is passed through it. When the current passes through the element, the resistance increases and the element will heat up and activate the PTC thermistor in the element holder.

When the current exceeds the element’s rated value, the thermistor will instantly expand and move the contact arm in the element holder, which cuts off the power supply and prevents further current flow. The advantages of this type of fuse is that it is able to switch off and reset automatically, thus avoiding the need for manual resetting and/or replacement of the fuse.

The MF-R135-AP has a wide range of applications and is designed to provide reliable protection against short circuit and overcurrent conditions. It is primarily used in power supply circuits, such as in AC adapters, cordless phones, digital audio players, and gaming consoles. It can also be found in automotive alternators, consumer electronics, and PC boards.

The working principle of the MF-R135-AP is fairly straightforward. When an overcurrent situation occurs, the thermistor in the element holder expands and the contact arm closes off the circuit. This effectively stops the flow of current to the device and allows the element to cool down. When the temperature of the element goes back below the rated value, the thermistor contracts and the contact arm reopens the circuit, allowing current to resume flowing.

In conclusion, the MF-R135-AP is a versatile PTC resettable fuse that can be used to protect a wide variety of electronic components from overcurrent and short circuit conditions. It has the ability to switch off and reset automatically, which eliminates the need for manual resetting and/or replacement of the fuse. It is ideal for applications that require reliable overcurrent protection without the hassle of regular fuse replacement.

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