1812L020/60DR

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PTC Resettable Fuses are widely used in various applications and 1812L020/60DR specifically are seen in fields such as computers, routers, and other electrical and electronic equipment. It features a snap-acting bi-metal strip design which is designed to protect equipment from high voltage and short currents. This device works by compressing two clamped ends of the fuse when under overvoltage, leading to a sharp increase in resistance and thus providing protection from short current.

The structure of the 1812L020/60DR can be divided into two parts. The first part is the bi-metal strip which is model composed of two metals with different thermal coefficients welded in series. The second part is the plastic enclosure that provides insulation and filing for the bi-metal strip. The two components are then put together and placed in a hole in the circuit board. When the voltage exceeds the overvoltage threshold, the bi-metal strip interior has a thermal runaway effect resulting in a temperature increase that exceeds the insulation capability of the plastic case causing it to melt which then disconnects the circuit.

The working principle of the 1812L020/60DR can be broken down further into three steps. Firstly, when a voltage exceeding the overvoltage threshold is applied, the bi-metal strip will compress itself into a U-shape which results in a significant increase in electrical resistance. This increase in resistance not only limits the fault current but also dissipates the heat generated which reduces the further thermal runaway of the bi-metal strip. Second, when the temperature of the device reaches an ever-higher threshold, the plastic enclosure which is surrounding the bi-metal strip will melt, thus isolating the bi-metal strip from the circuit and totally disrupting the current.

Finally, after the current has been diverted, the thermal energy which was created in the overvoltage situation dissipates leaving the bi-metal components to relax back into their original shape. At this point, the plastic enclosure returns to a solid state and the current is able to continue normally again. This process is known as “resetting” and allows the device to operate again without any damage to the circuit board.

The binding amongst the three components of the 1812L020/60DR make it a reliable electrical device for protection against overvoltage and overcurrent. This device is also widely used due to its ease of installation and relatively low cost when compared to other alternatives. Therefore, this PTC Resettable Fuse is a great choice for electrical and electronic applications.

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