Siemens 3RP1511-1AP30 Electronic Time Delay Relay

Siemens 3RP1511-1AP30 is an electronic ON-delay timing relay with a single change-over contact and a 0.5 to 10 second time range, designed to energize a circuit after a precise delay. It accepts multiple control voltages: 24 VAC, 200-240 VAC, or 24 VDC, and includes a built-in LED indicator for status. The device is mounted with screw terminals for straightforward wiring and is part of Siemens’ SIRIUS timing-relay family; its coil consumes about 1 W. The relay enclosure provides front IP40 protection, while the terminals themselves are IP20, and it is rated for installation up to 2,000 meters above sea level. It is a phased-out product, with Siemens directing users to the 3RP2511-2AW30 as the preferred successor. Typical applications include automation sequences where a timed on-delay is required to start or release equipment, such as heaters, conveyors, or control relays in machine controls. The 3RP1511-1AP30’s combination of a single SPDT contact, robust voltage flexibility, and LED feedback make it suitable for compact control panels where a precise delay is needed without external relays or complex wiring.