MF-R900-AP

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PTC Resettable Fuses: MF-R900-AP Application Field and Working Principle

PTC resettable fuses are electronic safety devices designed to protect electronic equipment from over-current situations. The MF-R900-AP is a surface mount resettable fuse from Murata Power Solutions that offers over-current protection in harsh automotive and industrial environments. It employs a PPTC element that will detect an over-current fault and open the circuit, and its resistance goes up to open circuit status. After the over-current is removed, the fuse will reset, returning to its original low-resistance state, ready to protect again.

The MF-R900-AP offers wide current ratings, from 0.05A to 20A, with multiple options for reset characteristics, time delay interval, response time, voltage ratings, and housing sizes. It has become a popular choice for a range of demanding automotive and industrial applications, since it\'s designed to operate in temperatures ranging from -40°C to 125°C, and is capable of operating up to 85°C for 10,000 hours at rated current without degradation. It provides superior surge current capacity and long life operation compared to other resettable fuses.

When the current rating is exceeded, the PPTC element’s resistance increases suddenly, which will cause the temperature to rise and open the circuit to prevent the over-current from passing. Upon completion of the current pulse, the PPTC element cools down, and the resistance returns to a meaningful low value in a few hours. The MF-R900-AP is designed to reset and restore the current low resistance value quickly, which occurs within a time window determined by the applicable part number.

The MF-R900-AP series makes a great choice for automotive systems that have high power loads with limited space. Its resistance to solder heat shock is superior to many other PTC resettable fuses, and the integrated PPTC element and metal body allows for reliable connection with any rectangular header. In addition, it has a compact size and offers high-temperature performance and easy mounting across a range of automotive applications.

This PTC resettable fuse also provides superior protection for applications dealing with high inrush current. It has a low power loss and fast response time, and it’s capable of limiting and cycling currents in minimal time; it can be used as a protection component for DC input power applications.

In summary, the MF-R900-AP is a PTC resettable fuse that’s designed to provide superior protection for automotive systems with limited space, and it’s suitable for applications dealing with high inrush current. It has wide current ratings, from 0.05A to 20A, and it’s capable of operating in temperatures between -40°C and 125°C. It’s also designed to reset and restore the current low resistance value quickly, which can help protect electronics from over-currents.

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