CL-140A

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Inrush Current Limiters (ICLs) serve to protect against high inrush currents and variable loads. The CL-140A is an inrush current limiter designed to provide protection to motors, transformers and other electrical equipment that requires current limiting for normal operation. The CL-140A is designed to be used with resistive loads, inductive loads, or a combination of both. This article will focus on the CL-140A application field and working principle.

CL-140A Application Field

The CL-140A is designed to be used in applications where there are short duration, high current inrushes such as motor start-ups, transformer energizations, or other high current switching transients. The CL-140A is also used to protect equipment from current surges caused by variable loads. The CL-140A is designed to protect transformers up to 135 kVA and motors up to 230 amp. It is also designed to be installed near the motor or transformer, so that when the current inrush passes through the CL-140A, it is subjected to rapid current limiting.

CL-140A Working Principle

The CL-140A operates according to a two-stage operation whereby a high-voltage gas-filled spark gap limits the current during the initial inrush. Once the peak current has been reached, the built-in SCR is triggered by the voltage across the spark gap and turns on to provide the continuous current limiting action. The built-in SCR allows the current flow to remain constant until the current inrush passes and the SCR turns off. During operation, the CL-140A is designed to reduce the current level to approximately 70% of the unused current level.

CL-140A Protection Features

The CL-140A provides several protection features:

• Protection against short-term inrush currents.
• Improved motor and transformer load regulation.
• Protection against power surges from variable loads.
• Protection against over-voltage and over-current faults.
• Protection against ground fault currents.
• Dip and Zero-Cross Protectors to control the SCR Trigger Point.
• Easy installation.

Conclusion

The CL-140A inrush current limiter is designed to protect motors, transformers, and other electrical equipment from the damaging effects of high-level inrush current and surges from variable loads. The CL-140A operates according to a two-stage operation which involves a high-voltage gas-filled spark gap and a built-in SCR to provide the continuous current limiting action. The CL-140A also provides several protection features such as protection against short-term inrush currents, improved motor and transformer load regulation, and protection against power surges from variable loads. The CL-140A is an effective solution for protecting sensitive equipment from the damaging effects of an inrush current.

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