SSAC HRDS420 Solid State Timing Relay 120 VAC

SSAC HRDS420 is a 120 VAC solid-state timing relay with an adjustable delay range from 0.2 to 10 seconds, designed to trigger a relay output after the selected interval in automation circuits. Built around a solid-state timing circuit, it provides precise, repeatable delays with no moving parts, making it a durable choice over electromechanical timers in process control, conveyors, and packaging equipment. The device draws power from a 120 VAC supply, with input consumption specified as up to 4 VA; when powered from DC, it uses up to 2 W. As part of the SSAC family now under Littelfuse, HRDS420 embodies the brand’s emphasis on reliable timing controls for industrial environments. Typical applications include process timing, sequencing of equipment, and automation tasks where a compact, programmable delay helps coordinate sensors, actuators, and control logic. The 0.2 to 10 second window covers short startup delays and moderate interval timing, enabling engineers to fine-tune machine cycles without mechanical wear or audible relay chatter.