The ABB CT-ARS-21S is a time relay designed for use in electrical systems to control and protect circuits by providing time delay functions. It is commonly used in industrial , motor control, power systems, and various other applications where precise time-based control is required.

 The CT-ARS-21S relay helps in managing equipment start-ups, shutdowns, and fault protection through adjustable delay settings. 

CT-ARS-21S Provides time delay for the control of electrical devices, commonly used for delaying start, stop, or other time-sensitive operations in electrical circuits.

The CT-ARS-21S relay offers a wide adjustable time range, typically from 0.1 seconds to 100 hours, depending on the model and the specific application requirements.

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