{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3 NO instantaneous contacts, 48 V DC coil, screw and snap-on mounting on 35 mm DIN rail, 73 mm depth, 45 mm width.","salesMarkdown":"It is designed for control-circuit switching — signalling, interlocking, and extending contact density on a contactor or starter assembly. The S00 frame keeps the footprint compact at 45 mm wide, 57.5 mm tall, and 73 mm deep — it tucks into the space beside a main contactor without crowding the gland plate. ## Switching capability and contact ratings The three NO contacts are rated for AC-15 and DC-13 control-circuit duty across a wide voltage range. At 24 V the contacts carry 10 A; at 230 V they still carry 10 A, dropping to 3 A at 400 V and 1 A at 690 V. On the DC side, at 60 V the rating is 4.7 A, at 110 V it is 3 A, and at 220 V it is 1.2 A. These numbers govern the solenoid, relay, or pilot-device load the contacts can break — not motor current. ## Clearance, wiring, and environmental limits This keeps the part installable in a standard DIN-rail array without excessive dead space. The screw terminals accept two conductors per clamp — 2 × (0.5 to 1.5 mm²), 2 × (0.75 to 2.5 mm²), or 2 × 4 mm² solid or stranded — so daisy-chaining control wiring is straightforward. Operating temperature spans -25 to +60 °C, storage goes -55 to +80 °C, and the unit is rated for pollution degree 3 (conductive pollution typical in industrial panels). Relative humidity minimum is 10 %, and the part is RoHS-compliant per the 10/01/2009 substance prohibition date.","metaTitle":"Siemens 3RH2131-1BW40 SIRIUS Auxiliary Contactor, 3 NO Conta","metaDescription":"Siemens 3RH2131-1BW40 SIRIUS auxiliary contactor, size S00, 3 NO instantaneous contacts, 48 V DC coil. Screw and snap-on mounting on 35 mm DIN rail. Active production. Quoted to or","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"48 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.1","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","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 440 V rated value":"0.5 A","at 500 V rated value":"2 A","at 600 V rated value":"0.26 A","at 690 V rated value":"1 A","Instantaneous Contact":"3","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"4 W","holding power of magnet coil at DC":"4 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","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)","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","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","contact rating of auxiliary contacts according to UL":"A600 / Q600","Identification Number And Letter For Switching Elements":"31 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$21.59","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=172153&mlfb=3RH2131-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — 3RH2122-1BW40?","answer":"The 3RH2122-1BW40 is the same S00 frame with the same 48 V DC coil, but it carries 2 NO + 2 NC contacts instead of the 3 NO configuration on the 3RH2131-1BW40. It drops into the same footprint and wiring layout, so a panel designed around one can accept the other if the contact arrangement is adjusted."},{"question":"Will 3RH2131-1BW40 drop into a panel specified around 3RH2122-1BW40 without rewiring?","answer":"Yes — both parts share the S00 frame, same 45 mm width, same DIN-rail mounting, and same terminal layout. The only difference is the contact arrangement (3 NO vs 2 NO + 2 NC), so the wiring pattern must match the new contact configuration, but the physical fit and terminal positions are identical."},{"question":"What compliance documentation does Siemens provide for 3RH2131-1BW40?","answer":"The part carries RoHS compliance per the 10/01/2009 substance prohibition date. It is rated for pollution degree 3 per IEC 60947-1. Standard Siemens SIRIUS documentation includes the CE declaration of conformity and, where applicable, UL/CSA file numbers — these are available on request with the RFQ."},{"question":"Where can I buy 3RH2131-1BW40 and get current pricing?","answer":"This part is sourced and quoted 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 estimate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-1BW40","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/3RH2131-1BW40 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}}