{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1916-2DH21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1916-2DH21","canonicalUrl":"https://aoctrl.com/siemens/3RT1916-2DH21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1916-2DH21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS timing relay, 3RT1916-2DH21, OFF-delay function, adjustable time 0.5... 10 s, supply voltage 90... 240 V AC/DC, clip-on mounting, IP20.","salesMarkdown":"## What it is and what it does The Siemens 3RT1916-2DH21 is a SIRIUS timing relay — a dedicated OFF-delay timer that clips onto a DIN rail and controls when a downstream load drops out after the control signal is removed. Its adjustable time range of 0.5... 10 s covers common delay-on-release applications like fan run-down, conveyor brake sequencing, or post-lubrication cycles. The relay accepts a wide supply voltage of 90... 240 V AC (50/60 Hz) or DC, which simplifies stocking across panels with different line voltages. ## Key ratings and what they mean for fit The OFF-delay function means the relay's output remains energized for the set time after the input signal drops — critical for loads that must not stop abruptly. The minimum ON period of 35 ms ensures the timing circuit stabilizes before the delay starts. Recovery time of 150 ms is the minimum interval before the relay can be re-triggered after a timing cycle; if your process cycles faster than that, this relay will miss a pulse. Basic insulation per IEC 60947-1 and pollution degree 3 means the relay is rated for industrial environments with conductive dust or occasional condensation — standard for a control cabinet, not for clean-room or wet-area placement without an enclosure. The IP20 rating at the terminals means finger-safe but not sealed; the relay belongs inside a panel, not in a washdown zone. ## Mounting and integration Clip-on mounting snaps onto a standard 35 mm DIN rail. Dimensions of 45 mm wide × 38 mm deep × 38 mm high keep it compact for dense panel layouts. Mounting position is unrestricted — any orientation works, which helps when fitting into existing wireways or tight sub-panels. Wire termination accepts solid or stranded conductors from 18 to 14 AWG, matching typical control-circuit wiring.","metaTitle":"Siemens 3RT1916-2DH21 SIRIUS Timing Relay, OFF-Delay, 0.5-10","metaDescription":"Siemens 3RT1916-2DH21 SIRIUS timing relay with OFF-delay, adjustable 0.5-10 s, 90-240 V AC/DC. Clip-on mounting, IP20. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"38 mm","Solid":"18 ... 14","Width":"45 mm","at DC":"90 ... 240 V","Height":"38 mm","Maximum":"2 000 m","Typical":"100 000 000","Upwards":"0 m","Forwards":"0 m","ON-delay":"No","Stranded":"18 ... 14","at 50 Hz":"90 ... 240 V","at 60 Hz":"90 ... 240 V","Backwards":"0 m","Downwards":"0 m","OFF delay":"Yes","At The Side":"0 m","Non-Volatile":"No","Initial Value":"0.8","Mounting type":"clip-on","Pulse Delayed":"No","Pulse-Shaping":"No","Recovery time":"150 ms","During Storage":"-40 ... +85 °C","Adjustable time":"0.5 ... 10 s","Of The Terminal":"IP20","lifecycle_stage":"current","During Operation":"15 ... 95 %","During Transport":"-40 ... +85 °C","Full-scale value":"1.1","Delayed Switching":"0","Minimum ON period":"35 ms","Mounting position":"any","additive ON delay":"No","ON-delay/OFF-delay":"No","Product brand name":"SIRIUS","Star-Delta Circuit":"No","Type of insulation":"Basic insulation","Degree of pollution":"3","Product designation":"timing relay","acc. to IEC 61812-1":"EN 61000-6-2","Passing Make Contact":"No","Instantaneous Contact":"0","Passing Break Contact":"No","Semi-Conductor Output":"Yes","acc. to IEC 60068-2-6":"10 ... 55 Hz: 0.35 mm","acc. to IEC 60068-2-27":"11g / 15 ms","OFF delay/instantaneous":"No","at AWG conductors solid":"2x (20 ... 14)","Relative repeat accuracy":"1 %","at AWG conductors stranded":"2x (20 ... 14)","Pulse Delayed/Instantaneous":"No","Pulse-Shaping/Instantaneous":"No","Design of the surge suppressor":"with varistor","ON-delay/instantaneous contact":"No","additive ON delay/instantaneous":"No","ON-delay/OFF-delay/instantaneous":"No","Control supply voltage frequency 1":"50 ... 60 Hz","Star-Delta Circuit With Delay Time":"No","due to burst acc. to IEC 61000-4-4":"2 kV network connection / 1 kV control connection","Passing Break Contact/Instantaneous":"No","Product function star-delta circuit":"No","Protection against electrical shock":"finger-safe","Variably Clocked Start With Impulse":"No","Surge voltage resistance rated value":"4 000 V","Variably Clocked Start With Interval":"No","Reference code acc. to DIN EN 81346-2":"K","Fixed Clock Cycle Beginning With Pulse":"No","With Degree Of Pollution 3 Rated Value":"300 V","Finely Stranded With Core End Processing":"0.5 ... 2.5 m²","Fixed Clock Cycle Beginning With Interval":"No","For Auxiliary And Control Current Circuit":"screw-type terminals","Product extension optional remote control":"No","Product extension required remote control":"No","Flashing Symmetrically Starting With Pulse":"No","Passing Make Contact/Instantaneous Contact":"No","Design of the control terminal non-floating":"Yes","Flashing Asymmetrically Starting With Pulse":"No","Electrostatic discharge acc. to IEC 61000-4-2":"4 kV contact discharge / 8 kV air discharge","Flashing Symmetrically Starting With Interval":"No","Retriggerable With Deactivated Control Signal":"No","Type of voltage of the control supply voltage":"AC/DC","Flashing Asymmetrically Starting With Interval":"No","Retrotriggerable With Activated Control Signal":"No","Switching capacity current with inductive load":"0.3 A","Size of contactor can be combined company-specific":"S00","due to conductor-earth surge acc. to IEC 61000-4-5":"2 kV","Short-time withstand current (Icw) limited to 10 ms":"10 A","Removable Terminal For Auxiliary And Control Circuit":"No","at the relay outputs Switchover delayed/without delay":"No","Relative setting accuracy relating to full-scale value":"15 %","Flashing Symmetrically Starting With Pulse/Instantaneous":"No","Flashing Symmetrically Starting With Interval/Instantaneous":"No","Retrotriggerable With Activated Control Signal/Instantaneous Contact":"No","Retrotriggerable With Deactivated Control Signal/Instantaneous Contact":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=347906&mlfb=3RT1916-2DH21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1916-2DH21/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RT1916-2DH21 and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at that time."},{"question":"What is the adjustable time range on the 3RT1916-2DH21?","answer":"The OFF-delay is adjustable from 0.5 to 10 seconds via a front-panel potentiometer or DIP switch (the exact adjustment method depends on the variant; this unit has an adjustable time setting)."},{"question":"What supply voltage does the 3RT1916-2DH21 accept?","answer":"It accepts 90 to 240 V AC at 50/60 Hz and the same range for DC, giving it broad compatibility across common control voltages."},{"question":"Will the 3RT1916-2DH21 drop into a panel designed for a 3RT1016-1BB42 contactor?","answer":"No — the 3RT1916-2DH21 is a timing relay, not a contactor. It clips onto the same DIN rail but serves a different function (timed OFF-delay vs. power switching). It will not directly replace a 3RT1016-1BB42 without rewiring the control circuit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1916-2DH21","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RT1916-2DH21 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}