{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO instantaneous contacts, 110 V DC coil, screw and snap-on mounting, IP20 front protection.","salesMarkdown":"The coil is rated 110 V DC with a pick-up threshold of 0.8 x rated voltage and a drop-out threshold of 1.1 x rated voltage; closing and holding power are both 3.2 W DC. The contact ratings are given per IEC utilization category, not a single blanket current. At 24 V the contacts carry 10 A; at 110 V the rating drops to 1 A. At 230 V AC the rating is 6 A, at 400 V it is 3 A, at 500 V it is 2 A, and at 690 V it is 1 A. The 220 V DC rating is 0.27 A. These are the thermal continuous currents at the respective voltages — the actual switching capacity for inductive loads will be lower and should be verified against the load's inrush and time constant. Fastening is by screw or snap-on mounting onto a DIN rail. The size S00 footprint measures 45 mm wide, 57.5 mm high, and 72 mm deep. ## Environmental limits and mechanical endurance The contactor withstands shock at 10g for 5 ms and 5g for 10 ms. The rated surge voltage withstand is 6 kV, which aligns with overvoltage category III for 300 V AC systems. The solid conductor termination accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². This covers the common control wiring gauges for auxiliary circuits.","metaTitle":"Siemens 3RH1140-1BF40 SIRIUS Auxiliary Contactor, 4 NO, 110","metaDescription":"Siemens 3RH1140-1BF40 SIRIUS auxiliary contactor, size S00, 4 NO contacts, 110 V DC coil, rated 10 A at 24 V. IP20 front, screw/snap-on mount. Active production, available 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","Rated Value":"110 V","Initial Value":"0.8","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","Full-Scale Value":"1.1","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 690 V rated value":"1 A","Instantaneous Contact":"4","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"01.07.2006 00:00:00","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"3.2 W","holding power of magnet coil at DC":"3.2 W","reference code acc. to IEC 81346-2":"K","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","with low demand rate acc. to SN 31920":"40 %","with high demand rate acc. to SN 31920":"75 %","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","Of Auxiliary Contacts Instantaneous Contact":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"DC","B10 value with high demand rate acc. to SN 31920":"1 000 000; With 0.3 x Ie","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","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=405767&mlfb=3RH1140-1BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BF40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1140-1BF40 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time; no stock count or lead-time figures are published here."},{"question":"What is 3RH1140-1BF40's contact configuration?","answer":"It has four normally-open instantaneous contacts with no delayed, lagging, or make-before-break switching elements. The auxiliary switch extension is supported for adding more contacts."},{"question":"What compliance documentation does Siemens provide for 3RH1140-1BF40?","answer":"The part carries RoHS substance prohibitance compliance dated 01.07.2006. The reference code per IEC 81346-2 is K. Surge voltage resistance is rated at 6 kV, and pollution degree is 3 per IEC 60947-1."},{"question":"Will 3RH1140-1BF40 drop into a panel specified around 3RH2140-1BP40?","answer":"Both are size S00 SIRIUS auxiliary contactors with the same 45 mm width, so the DIN-rail footprint and panel cutout are identical. The difference is in coil voltage and contact arrangement — verify the coil voltage (110 V DC here) and the NO/NC count against the original specification before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1BF40","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/3RH1140-1BF40 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}}