Crydom 6201A AC Input Relay Module 90-140VAC (Lot of 4)

The Crydom 6201A is a compact AC input relay module designed for industrial automation and control systems. It converts AC input signals (90-140 VAC) into a DC logic output, making it ideal for interfacing with PLCs, microcontrollers, or other digital systems. Key features include optical isolation for noise immunity, fast response times, and a small footprint suitable for dense panel mounting. Advantages over electromechanical relays include longer lifespan (no moving parts), silent operation, and resistance to vibration and shock. Drawbacks may include higher cost per unit compared to basic mechanical relays and sensitivity to high temperatures beyond specified limits. Applications span process control, machine automation, HVAC systems, and signal conditioning in manufacturing environments. This lot of 4 units appears new in original packaging, based on image analysis showing unopened boxes and pristine module condition without wear, scratches, or discoloration. No serial numbers are visible on the faceplates in the images, and there are no attached parent/child assets like sensors or controllers. For detailed model decoding, Crydom's legacy documentation indicates '6201A' refers to a standard AC input module with 5V logic output. Comparable products from competitors like Opto 22 offer similar functionality but may lack Crydom's robust isolation ratings.