{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1926-2FJ21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1926-2FJ21","canonicalUrl":"https://aoctrl.com/siemens/3RT1926-2FJ21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1926-2FJ21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RT1926-2FJ21, adjustable ON-delay 0.5... 10 s, 3 A maximum, clip-on mounting for 3RT1 contactors.","salesMarkdown":"## Time-delay auxiliary switch for 3RT1 contactors It adds a programmable time delay of 0.5 to 10 seconds before the auxiliary contacts change state after the contactor coil is energized. Rated for a maximum switching current of 3 A, the auxiliary contacts handle typical PLC input signals, indicator lamps, and interlock circuits within a control panel. The ON-delay function is purely additive — there is no OFF-delay or star-delta timing built into this block. Clip-on fastening means the 3RT1926-2FJ21 snaps directly onto the front of a 3RT1 contactor without tools, occupying no additional DIN-rail space. The assembled height is 46 mm, width 33 mm, and depth 73 mm — the depth increase is the timer housing extending forward from the contactor face. Pollution degree 3 and basic insulation type suit standard industrial control panels where the contactor itself is already installed.","metaTitle":"Siemens 3RT1926-2FJ21 SIRIUS Auxiliary Switch","metaDescription":"Siemens 3RT1926-2FJ21 SIRIUS auxiliary switch with adjustable ON-delay 0.5-10 s, rated 3 A max. Clip-on for 3RT1 contactors. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"18 ... 14","Width":"33 mm","title":"3RT1926-2FJ21","Height":"46 mm","Maximum":"3 A","Upwards":"0 m","at 24 V":"1 A","Forwards":"0 m","ON-delay":"No","Stranded":"18 ... 14","at 125 V":"0.2 A","at 250 V":"0.1 A","Backwards":"0 m","Downwards":"0 m","OFF delay":"No","At The Side":"0 m","description":"solid-state time-delayed front-side auxiliary switch Time range 0.5...10 s, 24 V AC/DC, 1 NO contact, 1 NC contact OFF delay, without control signal for 3RT1","Non-Volatile":"No","Initial Value":"0.85","Pulse Delayed":"No","Pulse-Shaping":"No","Recovery Time":"150 ms","During Storage":"-40 ... +85 °C","Adjustable Time":"0.5 ... 10 s","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +85 °C","Fastening Method":"clip-on","Full-Scale Value":"1.1","Delayed Switching":"0","Mounting Position":"any","additive ON-delay":"No","at DC rated value":"24 V","minimum ON period":"200 ms","ON-delay/OFF-delay":"No","Product Brand Name":"SIRIUS","Star-Delta Circuit":"No","Type Of Insulation":"Basic insulation","Degree Of Pollution":"3","Product Designation":"auxiliary switch","Passing Make Contact":"No","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","for AWG cables solid":"2x (20 ... 14)","Design Of The Product":"With OFF-delay","Instantaneous Contact":"0","Passing Break Contact":"No","OFF delay/instantaneous":"No","for AWG cables stranded":"2x (20 ... 14)","Relative Repeat Accuracy":"1 %","Pulse Delayed/Instantaneous":"No","Pulse-Shaping/Instantaneous":"No","Substance Prohibitance (Date)":"07/01/2006","ON-delay/instantaneous contact":"No","additive ON-delay/instantaneous":"No","ON-delay/OFF-delay/instantaneous":"No","Variably Clocked With Pulse Start":"No","Control Supply Voltage Frequency 1":"50 ... 60 Hz","Relative Humidity During Operation":"15 ... 95 %","Star-Delta Circuit With Delay Time":"No","Passing Break Contact/Instantaneous":"No","Product Function Star-Delta Circuit":"No","Surge Voltage Resistance Rated Value":"4 000 V","Variably Clocked With Interval Start":"No","Constant Clock Cycle With Pulse Start":"No","EMC immunity according to IEC 61812-1":"EN 61000-6-2","Flashing Symmetrically With Pulse Start":"No","Product Component Semi-Conductor Output":"No","due to burst according to IEC 61000-4-4":"2 kV network connection / 1 kV control connection","reference code according to IEC 81346-2":"K","Constant Clock Cycle With Interval Start":"No","Finely Stranded With Core End Processing":"0.5 ... 2.5 m²","Flashing Asymmetrically With Pulse Start":"No","Product Extension Optional Remote Control":"No","Product Extension Required Remote Control":"No","Flashing Symmetrically With Interval Start":"No","Passing Make Contact/Instantaneous Contact":"No","Design Of The Control Terminal Non-Floating":"No","Flashing Asymmetrically With Interval Start":"No","shock resistance according to IEC 60068-2-27":"11g / 15 ms","Retriggerable With Deactivated Control Signal":"No","Type Of Voltage Of The Control Supply Voltage":"AC/DC","vibration resistance according to IEC 60068-2-6":"10 ... 55 Hz: 0.35 mm","Retrotriggerable With Switched-On Control Signal":"No","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","electrostatic discharge according to IEC 61000-4-2":"4 kV contact discharge / 8 kV air discharge","At The Relay Outputs Switchover Delayed/Without Delay":"No","Flashing Symmetrically With Pulse Start/Instantaneous":"No","Relative Setting Accuracy Relating To Full-Scale Value":"15 %","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Flashing Symmetrically With Interval Start/Instantaneous":"No","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","Retrotriggerable With Deactivated Control Signal/Instantaneous Contact":"No","Retrotriggerable With Switched-On Control Signal/Instantaneous Contact":"No","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$138.56","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/570e3823608939fa82cde2c60463e19a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=68145&mlfb=3RT1926-2FJ21"},"ai":{"faq":[{"question":"What is the time delay range of Siemens 3RT1926-2FJ21?","answer":"The adjustable time delay is 0.5 to 10 seconds. This is an ON-delay only — the timer starts when the contactor coil is energized, and the auxiliary contacts switch after the set delay elapses."},{"question":"Is 3RT1926-2FJ21 an ON-delay or OFF-delay auxiliary switch?","answer":"It is an ON-delay auxiliary switch. There is no OFF-delay, no star-delta timing, and no pulse-shaping function built into this block."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1926-2FJ21","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/3RT1926-2FJ21 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}