{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1926-2EJ21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1926-2EJ21","canonicalUrl":"https://aoctrl.com/siemens/3RT1926-2EJ21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1926-2EJ21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RT1926-2EJ21, adjustable ON-delay 0.5-10 s, clip-on mounting, 3 A max contact rating.","salesMarkdown":"## What this auxiliary switch does on a SIRIUS contactor The 3RT1926-2EJ21: The delay is set via a potentiometer on the face, covering 0.5 to 10 seconds, with a recovery time of 150 ms between cycles. It mounts in any position and fits the standard SIRIUS contactor footprint — no extra DIN rail space needed beyond the contactor itself. ## Contact ratings and wiring Terminals accept solid wire 18-14 AWG and stranded wire 18-14 AWG, with dual-wire capability for daisy-chaining.","metaTitle":"Siemens 3RT1926-2EJ21 SIRIUS Auxiliary Switch","metaDescription":"Siemens 3RT1926-2EJ21 SIRIUS auxiliary switch with adjustable ON-delay 0.5-10 s. Clip-on mounting for SIRIUS contactors. Rated 3 A max. Sourced to order.","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":"3RT1926-2EJ21","Height":"46 mm","Maximum":"3 A","Upwards":"0 m","at 24 V":"1 A","Forwards":"0 m","ON-delay":"Yes","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 ON delay, 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","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","at AWG cables solid":"2x (20 ... 14)","Passing Make Contact":"No","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","Design Of The Product":"slow-operating","Instantaneous Contact":"0","Passing Break Contact":"No","at AWG cables stranded":"2x (20 ... 14)","OFF delay/instantaneous":"No","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 (Switching Cycles) Typical":"10 000 000","Size Of Contactor Can Be Combined Company-Specific":"S0 ... S12","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":"$32.92","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bb98460be5f3dcaa7cfd7075ecdb36c2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=100800&mlfb=3RT1926-2EJ21"},"ai":{"faq":[{"question":"How do I order the Siemens 3RT1926-2EJ21 and get a price?","answer":"No stock-holding claim; we quote per request."},{"question":"What contactors is the 3RT1926-2EJ21 compatible with?","answer":"It clips onto any SIRIUS contactor that accepts the standard auxiliary switch front-mount interface — the same form factor used across the SIRIUS 3RT2 contactor range."},{"question":"How do you set the time delay on the 3RT1926-2EJ21?","answer":"Turn the potentiometer on the front face of the switch. The delay range is 0.5 to 10 seconds, adjustable continuously between those limits. No tools needed."},{"question":"Does the 3RT1926-2EJ21 support both NO and NC contacts?","answer":"This specific variant provides an ON-delay make contact only. It does not include an OFF-delay or a break contact function."},{"question":"Is the 3RT1926-2EJ21 a substitute for the 3RT1926-2EJ20?","answer":"The 3RT1926-2EJ21 is the adjustable ON-delay variant. The 3RT1926-2EJ20 is a fixed-delay version — they share the same mechanical footprint and wiring, but the adjustment method differs. Confirm the delay type your circuit requires before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1926-2EJ21","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/3RT1926-2EJ21 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}}