{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1AK20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1AK20","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1AK20","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1AK20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO contacts, 45 mm width, screw and snap-on mounting, IP20 front, 3RH1140-1AK20.","salesMarkdown":"The Siemens 3RH1140-1AK20 is a SIRIUS auxiliary contactor in size S00, carrying four normally open (4 NO) instantaneous contacts with no delayed, lagging, or make-before-break switching — a straight-forward signal-follower for control circuits in motor starter assemblies or PLC output isolation. Rated operational current spans 10 A at 24 V up through 1 A at 690 V, with intermediate ratings at 110 V (1 A), 220 V (0.27 A), 230 V (6 A), 400 V (3 A), and 500 V (2 A) — covering the common control-voltage range from 24 VDC to 690 VAC. Shock resistance 10g / 5 ms and 5g / 10 ms — fine for most fixed industrial machinery, not for mobile equipment. Solid wire terminations accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and 2x 4 mm² — covers the typical control-circuit wire gauges from signal-level up to 4 mm² for longer runs. Surge voltage resistance rated at 6 kV. Substance prohibitance per RoHS applies from July 1, 2006 — the part is RoHS-compliant for EU markets.","metaTitle":"Siemens 3RH1140-1AK20 SIRIUS Auxiliary Contactor, 4 NO, S00,","metaDescription":"Siemens 3RH1140-1AK20 SIRIUS auxiliary contactor, size S00, 4 NO contacts, 45 mm width, IP20 front, screw and snap-on mounting. Active lifecycle, sourced to order. Request quote fo","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 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","1 Rated Value":"50 Hz","2 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 50 Hz rated value":"120 V","at 500 V rated value":"2 A","at 60 Hz rated value":"120 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","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","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=10622&mlfb=3RH1140-1AK20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1AK20/alternatives.json"},"ai":{"faq":[{"question":"What is 3RH1140-1AK20's contact configuration?","answer":"Four normally open (4 NO) instantaneous contacts — no delayed, lagging, or make-before-break switching. Leading and lagging contact counts are both zero."},{"question":"What compliance documentation does Siemens provide for 3RH1140-1AK20?","answer":"RoHS compliance is confirmed with a substance prohibitance date of July 1, 2006. The part carries IP20 front protection and pollution degree 3 rating. Surge voltage resistance is 6 kV."},{"question":"Will 3RH1140-1AK20 drop into a panel specified around 3RH2131-2AK60 without rewiring?","answer":"Both are SIRIUS auxiliary contactors in size S00 with 45 mm width and screw/snap-on DIN mounting, so the mechanical footprint matches. However, 3RH1140-1AK20 carries 4 NO contacts while 3RH2131-2AK60 has a different contact arrangement — verify your control circuit's NO/NC requirements before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1AK20","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/3RH1140-1AK20 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}}