{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1926-2FL21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1926-2FL21","canonicalUrl":"https://aoctrl.com/siemens/3RT1926-2FL21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1926-2FL21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RT1926-2FL21, adjustable ON-delay 0.5...10 s, clip-on mounting, 3 A max, 73 x 33 x 46 mm.","salesMarkdown":"## Adjustable ON-delay 0.5...10 s — what it means for the circuit The 3RT1926-2FL21 is a SIRIUS auxiliary switch with an adjustable ON-delay timer covering 0.5 to 10 seconds. That range covers most sequence-start and staggered-pickup applications on a contactor rail — think staging multiple motor starters so they don't all hit the line at once. It clips onto a 3RT1 contactor (the standard SIRIUS footprint), so no extra DIN-rail space or wiring is needed. The delay is set by a potentiometer on the face — no software, no programming module. ## Contact ratings — 3 A max, derated by voltage The switch contacts are rated 3 A maximum, but the real-world current depends on the control voltage: 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V. That's typical for an auxiliary contact block — sized for PLC inputs, contactor coils, and signal lamps, not power loads. The minimum ON period is 200 ms, and the recovery time between cycles is 150 ms. If the control signal pulses shorter than that, the timer won't latch. ## Clip-on mounting, any position, -25 to +60 °C operation Fastening is clip-on — it snaps directly onto the front of a 3RT1 contactor without tools. Mounting position is any, which helps in tight panels where the contactor is sideways or upside-down. The insulation is basic, pollution degree 3, so it's fine for standard industrial control panels but not for wet or conductive-dust environments without an enclosure. Dimensions are 73 mm deep, 33 mm wide, 46 mm tall — the width matches the contactor profile so it doesn't overhang.","metaTitle":"Siemens 3RT1926-2FL21 SIRIUS Auxiliary Switch, 0.5-10s Delay","metaDescription":"Siemens 3RT1926-2FL21 SIRIUS auxiliary switch with adjustable ON-delay 0.5-10 s. Clip-on for 3RT1 contactors. Rated 3 A max, 1 A at 24 V. Quoted 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":"3RT1926-2FL21","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","at 50 Hz":"200 ... 240 V","at 60 Hz":"200 ... 240 V","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, 200... 240 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","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","at AWG cables solid":"2x (20 ... 14)","Passing Make Contact":"No","Design Of The Product":"With OFF-delay","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","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":"$138.56","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3bd7462eb540bac960f744a673916085.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=523366&mlfb=3RT1926-2FL21"},"ai":{"faq":[{"question":"What is the exact time delay range of 3RT1926-2FL21?","answer":"The adjustable ON-delay range is 0.5 to 10 seconds. It is set via a potentiometer on the switch face. There is no OFF-delay or star-delta timing function on this unit."},{"question":"Is 3RT1926-2FL21 compatible with Siemens 3RT1 contactors?","answer":"Yes. The clip-on mounting is designed for the SIRIUS 3RT1 contactor family. It snaps onto the front of the contactor without additional hardware or DIN-rail space."},{"question":"Does 3RT1926-2FL21 provide ON delay or OFF delay?","answer":"It provides adjustable ON-delay only. There is no OFF-delay, no pulse-shaping, and no star-delta timing function on this auxiliary switch."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1926-2FL21","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/3RT1926-2FL21 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}}