{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1431-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1431-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RH1431-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1431-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH1431-1BW40, 48 VDC coil, 3 NO + 1 NC contacts, size S00, screw and snap-on mounting, IP20 front.","salesMarkdown":"It's built for control-circuit switching in motor starter assemblies, conveyor zone logic, or any panel where you need to multiply contact signals from a PLC or relay output. The 48 VDC coil draws 3.2 W closing and holding, so the power supply budget is straightforward — no inrush spike to derate against. The contact ratings are given per voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are thermal current values for the auxiliary contacts — they tell you the continuous current the contacts can carry at each voltage level. For a 24 VDC control circuit feeding multiple sensor inputs, the 10 A rating gives plenty of headroom. At 690 V, the 1 A limit means this contactor is not for power switching; it's strictly a signal-level auxiliary device. Pickup voltage is 0.8 x rated (38.4 VDC), drop-out is 1.1 x rated (52.8 VDC). That's a standard margin — the coil will reliably pull in at 38.4 V and drop out when voltage rises above 52.8 V. The 6 kV surge voltage resistance (rated impulse withstand) means it can handle transient spikes common on industrial control panels without flashover. Mechanical life is 5 million operations typical. Mounts via screw or snap-on to DIN rail. The size S00 footprint is compact: 57.5 mm high, 90 mm wide, 72 mm deep. That's useful when you're squeezing it into a crowded panel alongside contactors and overload relays. Wire termination accepts solid conductors: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or 2x 4 mm². AWG equivalents: 2x (20... 16), 2x (18... 14), or 1x 12. The auxiliary switch block is field-expandable (product extension auxiliary switch: Yes), so you can add more contacts if the built-in 3 NO + 1 NC isn't enough.","metaTitle":"Siemens 3RH1431-1BW40 SIRIUS Auxiliary Contactor, 48 VDC, 3","metaDescription":"Siemens SIRIUS 3RH1431-1BW40 auxiliary contactor, 48 VDC coil, 3 NO + 1 NC contacts, size S00, IP20 front, screw/snap-on mount. Current production. 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":"90 mm","Height":"57.5 mm","Rated Value":"48 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":"5 000 000","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 (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","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":"5 000 000","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=250766&mlfb=3RH1431-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1431-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What is the coil voltage and contact configuration?","answer":"The coil is rated 48 VDC. The contact configuration is 3 normally-open and 1 normally-closed instantaneous contacts (3 NO + 1 NC)."},{"question":"What are the key contact ratings?","answer":"At 24 V rated value: 10 A. At 230 V: 6 A. At 400 V: 3 A. At 500 V: 2 A. At 690 V: 1 A. These are thermal current ratings for the auxiliary contacts."},{"question":"Where can I buy 3RH1431-1BW40?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What compliance documentation is available for 3RH1431-1BW40?","answer":"The part carries a RoHS compliance date of July 1, 2006 (substance prohibition date). It is a Siemens SIRIUS product, so standard manufacturer declarations (CE, UKCA, IEC) are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1431-1BW40","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/3RH1431-1BW40 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}}