MF-R090-2 Circuit Protection

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PTC Resettable Fuses are safety components used to protect circuits from high current surges. In case of an overload, they trigger an internal switch to open in order to protect the circuit. They are relatively small compared to conventional fuses, so they are easy to install in tight spaces. MF-R090-2 is one of the typical PTC Resettable Fuses.

MF-R090-2 Application Field and Working Principle

MF-R090-2 PTC Resettable Fuse is a 90-amp rated current device in a size of 9x19mm. It is mainly used for overcurrent protection and inrush current limitation of automotive, avionics, telecommunications, industrial equipment and home electronics, etc. It measures the current passing through it with the property of PTC thermistor. When the current is below the rated value, it acts like a low resistance allowing current to pass. When an over current situation develops, the resistance of the PTC thermistor significantly increases, thus providing protective over-current protection.

MF-R090-2 also features low power consumption and low holding current, besides over current protection. The working principle starts with current flow into the device, heating up the PTC thermistor and increasing its resistance. When the temperature of the device reaches a certain peak, a switch inside will be activated to stop the current. The switch will not reset until the temperature was cooled down, which requires the current to be reduced to around 20% of the rated value.

The R090-2 also features self-restoration by stopping the current and resetting automatically once the over-current condition has been reversed. Traditional fuses require replacement once the circuit is opened, while this device can reset and restore itself after short circuit or over-current protection. This not only saves time and cost, but also increases the safety of the circuit.

The benefit of using MF-R090-2 is that it is a reliable and robust over-current protection device, which combines both features of a fuse and a circuit breaker into one. The safe operation of the device can prevent power overload and potentially increase the life expectancy of related products. The size of the device is small, which is ideal to install in tight spaces.

In conclusion, MF-R090-2 is a PTC Resettable Fuse widely used for over-current protection. Its small size and reliable performance make it perfect for industrial, automotive, avionics, telecommunications and home electronics applications. The integrated self-restoration feature on this device also adds to its safety and versatility.

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