RXEF020S

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PTC Resettable Fuses: RXEF020S Application Field and Working Principle

PTC (Positive Temperature Coefficient) Resettable Fuses are gaining popularity in protection applications, such as circuit board, USB port, LED lighting and so on. RXEF020S is a new type of PTC Resettable Fuse, which is designed to protect two-pole of low voltage circuit from overcurrent, over-temperature or overvoltage damage. It has a wide range of application, including LED lighting, consumer electronics, power electronic equipment, automotive electronics, and medical/industrial equipment.

The RXEF020S consists of two parts. One part is the PTC thermistor, which is composed of two leaded and one or two internal electrodes. The other part is the electronic control circuit, which is connected between the PTC thermistor and an external circuit. The electronic control circuit can detect the overcurrent, over-temperature or overvoltage condition and shuts off the supply to the PTC thermistor. This prevents the device from overheating and causing damage to the device.

RXEF020S has an effective current range from 0.2A to 1.5A. It can withstand temperatures up to 125°C and can provide surprisingly low voltage drop when in operation. The device is also equipped with reverse-current protection, which prevents any short-circuiting and inadvertent reverse-connection. This helps to ensure reliable operation under both normal and abnormal conditions.

The working principle of RXEF020S is based on the PTC effect. The PTC effect occurs when the temperature of a certain material reaches a certain temperature, the electrical resistivity of the material increases exponentially,this will increase the current flowing through the device and it will reach a level at which the current can no longer flow and the circuit is shut off until it cools down and the current can resume. Consequently, when an overcurrent, over-temperature or overvoltage occurs in a circuit, the RXEF020S will respond by tripping and effectively isolating the current, protecting the supply components from further damage.

RXEF020S is a low-cost, yet efficient PTC Resettable Fuse. It features excellent protection properties and has a wide range of applications. Its simple circuit design allows for easy integration into existing circuits and protection is effective even under extreme temperature/voltage conditions. It is an ideal choice for those looking for reliable protection and low overall cost.

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