Square D by Schneider Electric 8501 DO22 Pilot Duty Control Relay

Square D by Schneider Electric 8501 DO22 Pilot Duty Control Relay is a four‑pole control relay featuring two normally open and two normally closed contacts rated for 10 A at up to 600 VAC, designed for pilot‑duty switching in industrial control circuits. It provides reliable interfacing between low‑voltage control signals and higher‑voltage loads, suitable for sequencing and interlocking in machine tools, conveyors, and control panels operating at 60 Hz. The DO22 variant is part of the 8501 family and is used where a compact relay configuration with mixed contact types is required to control auxiliary circuits, solenoids, or motor starters from logic signals, without changing the main power circuit. Applications span industrial automation where precise contact states must be maintained for safety interlocks, signaling, or control logic, and its 600 VAC rating supports general‑purpose AC loads in demanding environments.