MF-S120S

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PTC Resettable Fuses (also known as “polyfuses” or “thermal-cutoff fuses”) are designed to protect electronic devices from overcurrent. They are typically used in portable electronics, such as laptops, digital cameras, and cell phones. The MF-S120S from Littelfuse is a PTC Resettable Fuse designed for automotive applications, specifically for vehicle protection. This device is ideal for protecting electronic components in vehicles due to its high current capacity and wide temperature range.

The MF-S120S is a low-resistance, current-limiting PTC Resettable Fuse. It has a fast-acting response time and requires minimum current flow to activate. It is also relatively insensitive to current transients, making it ideal for automotive applications. When the current flow through the fuse reaches the device’s rated current (or higher), it quickly trips and cuts off the current flow. The device has an overcurrent reset capability, which allows it to reset after the current has dropped below the rated current.

The MF-S120S has a wide temperature range, from -40°C to +125°C, making it ideal for automotive applications. The device is also very small, only 20.3mm x 11.9mm x 3.8mm. This makes it easy to mount on printed circuit boards, making it suitable for use in portable electronic devices such as laptops and cell phones. The device has a rated current of 120A and a voltage rating of 32V DC.

The working principle of the MF-S120S is relatively simple. It uses a conductive element, which is usually a wire or a wire coil, and encases it in a polymeric material. When a current passes through the element, it generates heat which then causes a temperature increase. When the temperature reaches a certain point, the polymeric material melts, allowing the element to expand and increasing the resistance, which in turn causes the current to be diverted away from the device. This reduces the risk of components in the device being damaged due to an overcurrent.

The MF-S120S has a number of advantages over traditional fuses. It does not require any additional power to operate, meaning it can be used in battery-powered devices. It also does not need to be replaced after it trips, meaning it is more reliable than regular fuses. Lastly, it reset time is very short, typically a few milliseconds, meaning it is ideal for use in applications where quick response times are required.

In conclusion, the MF-S120S is a PTC Resettable Fuse designed for automotive applications. It has a fast response time, wide temperature range, and small size, making it ideal for use in portable electronics such as laptops and cell phones. The device works by using a conductive element to generate heat when a current passes through it, and when the temperature reaches a certain point, the element expands and causes the current to be diverted away from the device, protecting it from damage due to overcurrent.

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