{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1AH10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1AH10","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1AH10","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1AH10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary contactor, size S00, 3RH1140-1AH10, 4 NO instantaneous contacts, 10 A AC-12, screw and snap-on mounting, 45 mm width.","salesMarkdown":"## Auxiliary contactor for control-circuit switching The Siemens 3RH1140-1AH10 is a SIRIUS auxiliary contactor in size S00, carrying four normally-open instantaneous contacts for switching control circuits up to 10 A in AC-12 duty (resistive loads at 24 V). Rated operational current drops with voltage: 6 A at 230 V, 3 A at 400 V, 1 A at 690 V — so the 10 A figure applies only at 24 V, not across the full range. ## Rated switching capacity and contact reliability AC-12 rating of 10 A is the headline number, but the contactor also carries 1 A at 110 V and 0.27 A at 220 V for DC control circuits — the DC curve is much lower than the AC curve, so don't assume the AC rating transfers. Contact reliability is specified at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — a dry-circuit rating that matters for PLC inputs or low-level signal switching where oxide films can block conduction. Shock resistance of 10g / 5 ms and 5g / 10 ms covers most industrial panel vibration; the mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits tight enclosures without derating. ## Wiring and terminal data Screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid/stranded; AWG equivalents are 2x (20–16), 2x (18–14), and 1x 12. Surge voltage resistance is 6 kV, which coordinates with standard 400 V motor circuits and upstream Type 2 surge arrestors.","metaTitle":"Siemens 3RH1140-1AH10 SIRIUS Auxiliary Contactor, 4 NO, 10 A","metaDescription":"Siemens SIRIUS 3RH1140-1AH10 auxiliary contactor, size S00, 4 NO contacts, 10 A AC-12, 45 mm wide, IP20 front, screw and snap-on mounting. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","Height":"57.5 mm","at 60 Hz":"0.85 ... 1.1","1 Rated Value":"60 Hz","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Shock Resistance":"10g / 5 ms and 5g / 10 ms","Delayed Switching":"0","Lagging Switching":"0","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S00","Product Brand Name":"SIRIUS","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 1 mA)","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.27 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"2 A","at 60 Hz rated value":"127 V","at 690 V rated value":"1 A","Instantaneous Contact":"4","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Of Auxiliary Contacts Instantaneous Contact":"0","apparent holding power of magnet coil at AC":"4.6 VA","apparent pick-up power of magnet coil at AC":"27 VA","with high demand rate according to SN 31920":"75 %","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"AC","Inductive Power Factor With Closing Power Of The Coil":"0.8","Identification Number And Letter For Switching Elements":"40 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Inductive Power Factor With The Holding Power Of The Coil":"0.27","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"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=516311&mlfb=3RH1140-1AH10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1AH10/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RH1140-1AH10?","answer":"Submit an RFQ through this listing; pricing and stock are confirmed at quote time through our independent distribution network."},{"question":"What is the closest functional second-source to 3RH1140-1AH10?","answer":"The 3RH2440-1AP00 is a similar SIRIUS auxiliary contactor but in size S2 (wider footprint) with different terminal layout — it won't drop into an S00 panel without rewiring and DIN rail repositioning."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1AH10","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/3RH1140-1AH10 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}}