0251.750MXL

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Fuses provide a form of electrical protection that trips to safely remove power from an electrical circuit. The 0251.750MXL is an electronic fuse that utilizes high-speed, low-power semiconductor material to detect overcurrent and quickly disconnect from the circuit. This article will discuss the application field and working principle of the 0251.750MXL electronic fuse.

The 0251.750MXL is a high-performance, fast-acting fuse and is the industry’s smallest SMD fuse. It has a wide variety of applications, such as in power supply circuits, consumer electronics, automotive electronics, automotive interior lighting, industrial control circuits, and telecommunications. With its rapid response time, it is especially suited for use in high current inverter circuits and average current (AC), low voltage (LV) applications.

The fuse operates in a range of 0.25-9.00A and features an auto-reset design. The unique dual-layer ceramic substrate structure increases thermal conductivity and ensures current carrying ability and electrical field distribution, while providing superior force resistance to mechanical shock due to its shorter path length. The fuse has an operating temperature range of -55 to +125 degrees C, its rated voltage is 300VAC/120VDC and its operating voltage is 250VAC/110VDC.

The 0251.750MXL fuse utilizes a novel technology called second generation PTC (Positive Temperature Coefficient) switching for the detection of overcurrent. This mechanism has several advantages over its first generation counterpart in that it responds faster to overcurrents. Additionally, it also offers a very low “on” resistance that can be up to five times lower than its predecessor. This allows the 0251.750MXL fuse to operate with a maximum current rating of 9.00A, significantly higher than the 5.00A rating of first generation PTC fuses. This makes the 0251.750MXL the ideal choice for applications that require high-current protection in a small package.

As the current passes through the fuse’s substrate, it reaches the metallization layer, and an arms-length path to the fuse’s contact surface. As the temperature of the contact surface rises, its thermal expansion causes the contact surface of the fuse to deform, thus creating a physical separation between the power source and the load. This physical separation disconnects the circuit, thus providing the necessary protection against overcurrent. The fuse also has a cathode terminal, which functions as a thermal point of contact for the overcurrent protection. This is used to ensure better thermal conduction and thus faster response to overcurrent.

The 0251.750MXL fuse features an extreme maximum operating voltage of 300VAC/120DCV, making it ideal for use in most high-voltage applications. It also has a low resistance and a maximum margin of temperature degradation of <100°C at 150% of its rated current. These qualities make the 0251.750MXL an ideal choice for applications that require a reliable and fast-acting protection against overcurrent.

In conclusion, the 0251.750MXL is a high-performance fuse that offers superior protection against overcurrent. It utilizes a unique second-generation PTC switching mechanism, making it the ideal choice for a wide range of applications. It has a maximum margin of temperature degradation of <100°C, low resistance, and an extreme maximum operating voltage of 300VAC/120DCV. It is thus the ideal choice for high-voltage, high-current applications.

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