CL-21A

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Inrush Current Limiters (ICL), also known as Inrush Current Limiters or Inrush Limiters, are essential components for the electrical power industry. According to current requirements in various industries, new ICLs have been developed in recent years, including CL-21A. This article will discuss the application field as well as the working principle of the CL-21A.

The CL-21A Inrush Current Limiter is a single phase thermistor based ICL that provides reliable current-limiting protection, and is suitable for residential and commercial applications. It operates by limiting the starting current produced by a motor, preventing it from being overwhelming in dynamic loading, such as rapid start, stop and frequent switching. This product could also be used in motor circuits and other AC loads more than 1.5 times the rating current for a specified short-time period.

The application field of CL-21A mainly includes short-time overload protection of motor circuities, overload protection of power system, frequency change over-current protection, air conditioners and compressors overload protection and protector reset current as well as AC load current limiting. It can also be used in surge protectors for Telecommunication and CCTV systems, solar energy power and other DC load current limiting. The CL-21A is designed to reduce system downtime and ensure overload protection, improving the lifetime of the system.

CL-21A currently operates with thermistors manufactured in a few different materials and shapes. The thermistors are biased by a voltage line, which provides a reference voltage to the thermistors. When the current passes through it, the thermistors reduce the voltage and limit the current. The temperature of the thermistors will rise as the current increases, which causes the overall resistance of the thermistor to slowly increase. When the current reaches the limit, the thermistors will open to reduce current passing through it.

The CL-21A Inrush Current Limiter provides accurate current limiting protection through the thermistor as well as minimal application force. It also reduces the possibility of inrush current damage and provides high current limit accuracy. The material and shape of the CL-21A thermistors are adjustable in order to meet customer’s needs.

In conclusion, the CL-21A Inrush Current Limiter is a thermistor-based current-limiting protection device with wide application field. It operates by limiting the starting current produced by a motor, preventing it from being overwhelming in dynamic loading, such as rapid start, stop and frequent switching. The CL-21A also provides accurate current limiting protection through the high capacitance of the thermistor, and offers minimal application force. This reliable and efficient current-limiting protection device is the ideal choice for various industrial conditions.

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