{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1131-1BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1131-1BD40","canonicalUrl":"https://aoctrl.com/siemens/3RH1131-1BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1131-1BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1131-1BD40, 42 V DC coil, 3 NO contacts, S00 size, screw and snap-on mounting.","salesMarkdown":"The Siemens 3RH1131-1BD40 is a SIRIUS auxiliary contactor in the S00 frame size, carrying three normally-open instantaneous contacts and a 42 V DC coil. It is designed for snap-on mounting onto a DIN rail or screw fixing, making it a straightforward addition to a control panel where you need to extend the contact count of a main contactor or signal a PLC input. The 3 NO contacts give you three independent signal paths that close when the coil is energized — no delayed or make-before-break switching here, just clean instantaneous closure. AC-12 rated current hits 10 A at 24 V, which covers most PLC output and relay-interface loads. At 230 V AC the thermal current is 6 A, and at 400 V it drops to 3 A — that matters if you are switching a contactor coil or a small valve across phases. The DC switching capability is more limited: at 110 V DC the rated current is only 1 A, and at 220 V DC it falls to 0.27 A. For DC loads above a few watts at line voltage, the contactor will need derating or a DC-rated auxiliary block. The coil itself draws a steady 3.2 W holding power, which is low enough to keep the control transformer small.","metaTitle":"Siemens 3RH1131-1BD40 SIRIUS Auxiliary Contactor, 42 V DC","metaDescription":"Siemens 3RH1131-1BD40 auxiliary contactor, 42 V DC coil, 3 NO contacts, S00 size. Active production. Snap-on DIN rail. Order 3RH1131-1BD40.","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","Maximum":"2 000 m","At The Side":"0 mm","Rated Value":"42 V","On The Front":"IP20","Initial Value":"0.8","Mounting type":"screw and snap-on mounting","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","Auxiliary switch":"Yes","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","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","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","Closing power of magnet coil at DC":"3.2 W","Holding power of magnet coil at DC":"3.2 W","Operating current at AC-12 maximum":"10 A","Surge voltage resistance rated value":"6 kV","Reference code acc. to DIN EN 61346-2":"K","Reference code acc. to DIN EN 81346-2":"K","with low demand rate acc. to SN 31920":"40 %","With Degree Of Pollution 3 Rated Value":"690 V","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)","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","Of Auxiliary Contacts Instantaneous Contact":"0","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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Of The Contactor With Added Electronics-Compatible Auxiliary Switch Block Typical":"5 000 000"}},"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=117743&mlfb=3RH1131-1BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1131-1BD40/alternatives.json"},"ai":{"faq":[{"question":"Does 3RH1131-1BD40 have a datasheet with pinout and mounting information?","answer":"Yes, the official Siemens datasheet covers the pinout, mounting dimensions (45 x 57.5 x 72 mm), screw/snap-on installation, and the terminal wire ranges (0.5 to 4 mm² solid)."},{"question":"Where can I buy 3RH1131-1BD40?","answer":"This part is sourced to order; availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1131-1BD40","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/3RH1131-1BD40 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}}