{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1916-2CH21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1916-2CH21","canonicalUrl":"https://aoctrl.com/siemens/3RT1916-2CH21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1916-2CH21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS timing relay, 3RT1916-2CH21, ON-delay, adjustable 0.5...10 s, 90...240 V AC/DC, clip-on mounting.","salesMarkdown":"The Siemens 3RT1916-2CH21 is a SIRIUS timing relay — a single-function ON-delay relay with an adjustable time range of 0.5 to 10 seconds. The terminal enclosure carries IP20 protection, meaning it's finger-safe inside a panel but not rated for washdown environments. The adjustable ON-delay range of 0.5 to 10 seconds covers common sequencing requirements — staggering motor starts, delaying a pump after a level switch, or holding off a downstream conveyor until the upstream belt reaches speed. Recovery time is 50 ms, so the relay resets fast enough for rapid-cycle applications like indexing tables. Wire termination accepts solid or stranded conductors from 18 to 14 AWG (0.75 to 2.5 mm²). That's standard for control-circuit wiring in most industrial panels. Basic insulation per IEC 61812-1 means the relay is designed for use in circuits where the control voltage is isolated from the line voltage by at least basic insulation elsewhere in the system. It's not a standalone safety isolation barrier. Compliance documentation includes immunity per EN 61000-6-2 (industrial environment EMC), which is the typical requirement for CE marking on industrial control gear. No UL or CSA listing appears in the spec record, so verify with your local Siemens office if a UL 508 listing is required for your panel.","metaTitle":"Siemens 3RT1916-2CH21 SIRIUS Timing Relay, ON-Delay 0.5-10s","metaDescription":"Siemens 3RT1916-2CH21 SIRIUS timing relay, ON-delay adjustable 0.5-10s, 90-240V AC/DC, clip-on mount. Current lifecycle stage. 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":"Yes","Stranded":"18 ... 14","at 50 Hz":"90 ... 240 V","at 60 Hz":"90 ... 240 V","Backwards":"0 m","Downwards":"0 m","OFF delay":"No","At The Side":"0 m","Non-Volatile":"No","Initial Value":"0.8","Mounting type":"clip-on","Pulse Delayed":"No","Pulse-Shaping":"No","Recovery time":"50 ms","Adjustable time":"0.5 ... 10 s","Of The Terminal":"IP20","lifecycle_stage":"current","During Operation":"15 ... 95 %","Full-scale value":"1.1","Delayed Switching":"0","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 61346-2":"K","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","Voltage drop when switched through maximum":"3.5 V","Design of the control terminal non-floating":"No","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":"0.01 ... 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","Removable Terminal For Auxiliary And Control Circuit":"No","Short-time current resistance (Icw) limited to 10 ms":"10 A","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=175289&mlfb=3RT1916-2CH21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1916-2CH21/alternatives.json"},"ai":{"faq":[{"question":"What is the adjustable time range and recovery time?","answer":"The ON-delay is adjustable from 0.5 to 10 seconds. After the timing cycle completes, the recovery time is 50 ms before the relay can accept a new trigger."},{"question":"What supply voltage does it accept?","answer":"It accepts 90 to 240 V AC at 50 or 60 Hz, and 90 to 240 V DC. This wide-range input covers most global control voltages without needing a voltage selector."},{"question":"How does it mount and what wire sizes does it accept?","answer":"It clips onto a DIN rail and can be mounted in any orientation. The terminals accept solid or stranded wire from 18 to 14 AWG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1916-2CH21","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/3RT1916-2CH21 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}}