Siemens TRE221D40 Solid State Timing Relay 2-20 Sec

Siemens TRE221D40 Solid State Timing Relay provides a controlled 2–20 second delay when operated from a 110–120 V supply. As a solid-state timing device, it delivers a timing function without mechanical contacts, helping to coordinate sequencing in control panels and automation circuits. Designed for 110–120 V AC operation, the TRE221D40 is suitable for standard North American mains environments and can be used to trigger downstream equipment after a defined pause, such as pumps, fans, or conveyors, or to generate interlock delays in control logic. This model sits within Siemens' SIRIUS timing-relay family, offering compact integration into panel layouts where precise, repeatable delays are required. When planning installation, follow Siemens wiring and safety guidelines to ensure proper isolation and correct mounting for reliable operation.