2920L200DR

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PTC Resettable Fuses are well-known and reliable safety devices that prevent equipment and systems from dangerous levels of overcurrent. 2920L200DR is one type of these devices, which is widely used in telecommunications, medical, industrial, consumer electronic, home appliance, automotive and other applications. This article aims to describe the application field and working principle of 2920L200DR.

Application Field of 2920L200DR

2920L200DR is designed for systems that require a consistent and reliable current limiting protection for both AC and DC loads. It is available in an ultra-small 0402 surface mount package with a wide operating temperature range from -40℃ to +105℃. This PTC combines ideal current limiting protection with high trip accuracy and long life, making it an ideal choice for a variety of applications.

In the telecommunications industry, 2920L200DR is widely used in equipment like VoIP phone systems, DSL modems and routers, home gateways and other data communication products. In medical devices, it protects x-ray machines, ultrasounds devices, dental instruments and the like. It is also used in consumer electronic products such as electric scooter, drones, and power tools.

In the automotive industry, 2920L200DR is used to protect the starter system, remote control systems, lighting systems, display systems and power supply systems. In home appliance systems, it is commonly used for air conditioners, microwave ovens, washing machines, electronic humidifiers and the like. It is also widely used in industrial systems such as welding machines, robotic systems and 3D printers.

Working Principle of 2920L200DR

The working principle of 2920L200DR is based on the unique material characteristics of polymeric positive temperature coefficient (PTC) thermistors. In normal working conditions, the material exhibits a low electrical resistance, allowing unrestricted current flow. However, in conditions of overcurrent, the resistance of the thermal material increases rapidly in an exponential manner. This sudden rise in resistance will limit the current, thereby preventing the overcurrent from damaging the equipment.

Owing to a wide resistance tolerance and the ability to constantly reset, 2920L200DR provides high level of protection to the system. After an overcurrent event, as the equipment cools down, the PTC thermistor will reset to its initial low resistive state and resume normal operation. This process can be repeatedly repeated, enabling long-term reliable protection against overcurrent events.

2920L200DR is available in various trip currents from 0.040 to 4A. It is particularly suitable for applications with low fault current levels, where traditional overcurrent protection solutions, such as fuses and circuit breakers, are not applicable.

Conclusion

To summarize, 2920L200DR is a PTC Resettable Fuse with wide application field such as telecommunications, medical, industrial, consumer electronic, home appliance, automotive and other systems. It can detect and limit overcurrent in an exponential manner, and reset when the equipment is cooled down, thereby providing safe and reliable protection against overcurrent.

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