MF-R400-2 Circuit Protection

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PTC Resettable Fuses are becoming increasingly popular electrical components, due to their ability to provide reliable thermal protection without requiring prior removal or interruption of the electrical circuit. In particular, the MF-R400-2 is a popular choice, offering an impressive range of features. In this article, we will discuss the application field and working principle of the MF-R400-2.

The MF-R400-2 PTC Resettable Fuse provides versatile protection for overcurrent, short-circuit, and over-temperature conditions in applied electronic equipment. This is a single-use fuse, meaning it can protect just one circuit rather than an entire system. It features a dual-phase operation—in the normal operation, current flows through the polyswitch (the component containing the PTC element) without any impact on the circuit. However, when a preset current or temperature threshold is exceeded, the polyswitch trips and the current flow is interrupted, providing robust protection to the connected circuit and its components.

The MF-R400-2, like all PTC fuses, is designed with the ability to reset once the cause of an overcurrent event has been removed. It does this by taking advantage of the highly resistive nature of the PTC element to reduce its own temperature, which allows current to flow once again through the polyswitch. While this self-resetting feature offers immense convenience to automated systems, it also means that the device will have to be replaced once it has tripped a certain number of times, to ensure safety and reliability.

The MF-R400-2 is suitable for use in a wide range of applications, including automotive, audio, LED lighting, industrial control, appliances, and many more. This high level of flexibility means it can be used in industrial, commercial, or lighting applications, or in home and office electronic equipment. It is also compatible with a wide range of input voltage levels and is available in various mounting styles (through-hole and SMD).

The MF-R400-2 features a wide operating temperature range, from -40°C to +85°C, with its thermal protection threshold set to 60°C. Its maximum rated current is 6 A and its maximum rated voltage is 39 V. Its thermal resistance is 1.25 K/W °C, making it highly reliable and efficient. It is UL 1434 recognized and has obtained a wide range of certifications, such as UL, cUL, CE, ROHS, and SAE.

In summary, the MF-R400-2 PTC Resettable Fuse offers multiple protection functions, wide input voltage range, UL recognition, and a reset temperature of 60°C. It can be used in a wide range of applications and is designed for use in both industrial and consumer electronic equipment. It is an efficient, reliable, and cost-effective choice for many manufacturers.

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