{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2926-3AF31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2926-3AF31","canonicalUrl":"https://aoctrl.com/siemens/3RT2926-3AF31","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2926-3AF31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, mechanical latch, 3RT2926-3AF31, 110 V AC/DC, for S0 contactors, screw-type terminals, clip-on mounting.","salesMarkdown":"The Siemens SIRIUS 3RT2926-3AF31 is a mechanical latch designed to hold S0-size contactors (3RT202, 3RT232, 3RT252) in the closed position after the control signal drops — a common requirement for latching circuits in conveyor interlocks or emergency-off reset sequences. It accepts a 110 V AC/DC control supply, so one part covers both line and DC control buses without a separate coil change. The screw-type terminals take 2x 0.5…2.5 mm² solid or 1x 4 mm², matching standard panel wiring practice. Clip-on fastening snaps directly onto the contactor's front — no tools needed for initial fit, but verify the latch engages fully before energizing. The 22 mm width and 48.4 mm height keep it inside the S0 envelope; the 84.3 mm depth adds about 10 mm beyond the contactor body, so check gland-plate clearance if the panel is tightly packed. ## Electrical characteristics Coil power loss runs 4 W typical at DC and 4 VA typical at AC. The 4 kV surge voltage rating means the latch can handle switching transients on a 300 V insulation system without flashover.","metaTitle":"Siemens 3RT2926-3AF31 Mechanical Latch, 110 V AC/DC, S0","metaDescription":"Siemens SIRIUS 3RT2926-3AF31 mechanical latch for 3RT202/232/252 contactors. 110 V AC/DC, screw terminals, clip-on S0. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"84.3 mm","Solid":"2x (0.5 ... 2.5 mm²), 1x 4 mm²","Width":"22 mm","Height":"48.4 mm","at 50 Hz":"0.85 ... 1.1","at 60 Hz":"0.85 ... 1.1","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","Initial Value":"0.85","During Storage":"-50 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"clip-on","Full-Scale Value":"1.1","Lagging Switching":"0","Mounting Position":"any","Size Of Contactor":"S0","Solid Or Stranded":"0.5 ... 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"mechanical latch","at 50 Hz rated value":"110 V","at 60 Hz rated value":"110 V","Instantaneous Contact":"0","Substance Prohibitance (Date)":"10/01/2009","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"4 kV","for AWG cables for auxiliary contacts":"2x 14, 1x 12","Finely Stranded With Core End Processing":"2x (0.5 ... 2.5 mm²), 1x 2.5 mm²","control supply voltage 1 at DC rated value":"110 V","power loss [W] of magnet coil at DC typical":"4 W","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","Type Of Voltage Of The Control Supply Voltage":"AC/DC","power loss [V∙A] of magnet coil at AC typical":"4 VA","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"300 V","AWG number as coded connectable conductor cross section for auxiliary contacts":"14 ... 12"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/79f610ac3852fc33bf19a1a2152f6ceb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=239206&mlfb=3RT2926-3AF31","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2926-3AF31/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RT2926-3AF31 accept?","answer":"The screw terminals accept 2x 0.5…2.5 mm² solid or 1x 4 mm². For AWG, that translates to 2x 14 AWG or 1x 12 AWG. Finely stranded wire with ferrules uses 2x 0.5…2.5 mm² or 1x 2.5 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2926-3AF31","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/3RT2926-3AF31 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}}