{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1131-2BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1131-2BD40","canonicalUrl":"https://aoctrl.com/siemens/3RH1131-2BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1131-2BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 42 V DC coil, 3 NO instantaneous contacts, screw and snap-on mounting, IP20 front, 73 mm depth.","salesMarkdown":"Its 42 V DC coil draws 3.2 W during both pick-up and hold, so the coil-supply transformer or PLC output must be sized for that continuous load. Three normally-open instantaneous contacts handle the switching; there are no delayed, leading, lagging, or make-before-break contacts on this variant. ## Switching capacity by voltage — what the ratings mean The contact ratings are given at specific operating voltages, not as a single blanket current. At 24 V it carries 10 A; at 110 V it drops to 1 A; at 230 V it handles 6 A; at 400 V it is rated 3 A; at 500 V it is 2 A; and at 690 V it is 1 A. The 230 V and 400 V figures are the ones most often checked in European panel designs — 6 A at 230 V covers most pilot-duty and signal-lamp loads, while 3 A at 400 V is enough for small contactor coils or indicator circuits in a 400 V line. The 690 V rating (1 A) confirms it can be used in 690 V control circuits, but the current is low enough that you should verify the inrush of the downstream device. Mounting is by screw or snap-on onto a DIN rail. The screw terminals accept 2x (0.25 … 2.5 mm²) solid or 2x (24 … 14 AWG) stranded — strip length and ferrule size should follow the standard 8 mm practice for this terminal class. Shock resistance is 10g / 5 ms and 5g / 10 ms — adequate for most industrial machinery but not for high-g mobile or marine applications without additional damping.","metaTitle":"Siemens 3RH1131-2BD40 SIRIUS Auxiliary Contactor, 42 V DC, 3","metaDescription":"Siemens SIRIUS 3RH1131-2BD40 auxiliary contactor, 42 V DC coil, 3 NO contacts, size S00, IP20 front. Current-production part sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","Rated Value":"42 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":"3","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","closing power of magnet coil at DC":"3.2 W","holding power of magnet coil at DC":"3.2 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 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 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"3","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"31 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":"Cage Clamp 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=43556&mlfb=3RH1131-2BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1131-2BD40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1131-2BD40 and get a price?","answer":"This part is sourced and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit a request for quotation through the storefront."},{"question":"What is the depth of 3RH1131-2BD40?","answer":"The depth is 73 mm, with a width of 45 mm and height of 60 mm — the S00 frame size fits in the same DIN-rail footprint as the smallest SIRIUS contactors."},{"question":"What wire sizes does 3RH1131-2BD40 accept?","answer":"The screw terminals accept 2x (0.25 … 2.5 mm²) solid or 2x (24 … 14 AWG) stranded copper."},{"question":"Will 3RH1131-2BD40 drop into a panel specified around 3RH2122-1BW40?","answer":"Both are SIRIUS auxiliary contactors in size S00 with the same mounting footprint and terminal spacing, so the mechanical fit is identical. The difference is the contact configuration: 3RH1131-2BD40 has 3 NO + 0 NC, while 3RH2122-1BW40 has 2 NO + 2 NC. If your circuit needs the extra NC, this part will not match without rewiring."},{"question":"What compliance documentation does Siemens provide for 3RH1131-2BD40?","answer":"The part is RoHS-compliant per the July 1, 2006 date. It carries IP20 front protection and pollution degree 3 rating. Standard Siemens declarations of conformity (CE, UKCA) are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1131-2BD40","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/3RH1131-2BD40 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}}