MF-R400-0-99

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PTC (positive temperature coefficient) resettable fuses are temperature-sensitive components used to protect electronic circuits from over-current and excessive temperature conditions. They are available in various voltage and current ratings, depending on the application. One of the most popular types of PTC resettable fuses is the MF-R400-0-99, which is designed for high-current, low-voltage applications. This article will discuss the application field and working principle of the MF-R400-0-99.

The MF-R400-0-99 is widely used in applications such as automotive, lighting, and home electronic systems. It is ideal for applications such as computer systems, power supplies, and other low-voltage devices. The fuse has an operating current range between 400mA and 0.99A, making it suitable for applications that require precise current control. In addition, it has a low leakage current of 0.5mA and a high tripping temperature of 82°C, making it an excellent choice for protecting sensitive equipment from overcurrent and excessive temperature conditions.

The working principle of the MF-R400-0-99 is based on overheating protection. It is composed of a PTC element that is composed of a positive temperature coefficient material. When current flows through the PTC element, it heats up and its resistance increases. This in turn reduces the current flowing through the fuse, effectively cutting off any further current flow and protecting the circuits from overcurrent and excessive temperature conditions.

When the PTC element reaches the preset temperature range, it enters a self-resetting mode. The temperature is maintained at a safe level, and the device turns back on again with its normal resistive state. This self-resetting mode allows the fuse to repeatedly protect the underlying circuit from overcurrent and excessive temperature conditions.

The MF-R400-0-99 PTC resettable fuse also features a higher tripping temperature with a higher holding temperature. This makes it ideal for applications where higher current and temperature protection is required. It is also ideal for industrial applications where surge current spikes are an issue. By having a higher tripping temperature, the fuse can provide greater protection to the underlying circuit than regular thermal fuses.

Overall, the MF-R400-0-99 is an ideal choice for applications that require precise current control and high current and temperature protection. It is widely used in automotive, lighting, and home electronic applications and is an excellent choice for protecting sensitive equipment from overcurrent and excessive temperature conditions. The fuse works by increasing its resistance when subjected to an over-current or over-temperature condition, thereby preventing further damage to the underlying circuit. The self-resetting mode allows the device to repeatedly protect the underlying circuit from the same condition.

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