MF-RX375-2-99

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PTC resettable fuses are used to protect electronic devices from over-current damage, such as MF-RX375-2-99. Its application field and working principle will be discussed in the following sections.

Application Field

MF-RX375-2-99 PTC resettable fuses are commonly used in circuits that need to be protected from spurious over-currents. Examples include power converters, batteries, switching power supplies, computers, LCD monitors, TV sets, communications equipment, server power supplies, digital home appliances, medical systems, and portable devices.

Additionally, these fuses can be used in automobile and railway applications, such as electric motors, generators, and LED lighting systems. Thanks to their self-resetting capability, they are perfect for these industries where replacements for blown traditional fuses would be costly or inconvenient.

Working Principle

MF-RX375-2-99 PTC resettable fuses work based on a thermistor sensitive to temperature. The thermistor consists of a metal-oxide-semiconductor material, which has a negative temperature coefficient (NTC). This means that as the temperature increases, the resistance of the material decreases.

When a current passes through the PTC fuse, the domestic resistance of the thermistor increases as the temperature rises due to Joule heating. This allows the normal current to pass through, allowing the circuit to operate as desired. However, should a fault current occur, the resulting high temperature will cause the resistance of the thermistor to rise so high that the current is no longer able to pass through it, thus protecting the electronics circuit from damage.

When the temperature of the thermistor drops back down, the resistance will slowly decrease, allowing the current to flow again and resetting the circuit. This is why PTC fuses are so important in applications that require reliable circuit protection without engaging in maintenance and replacement of traditional fuses in the case of blowouts.

Conclusion

In conclusion, MF-RX375-2-99 PTC resettable fuses offer excellent protection for electronic circuits against over-currents. They have a wide range of applications, particularly in low-voltage and power electronics. Their self-resetting capability makes them perfect for use in industries such as automotive and railway engineering where replacement or repair of traditional fuses would be costly or inconvenient.

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