{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-2JB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-2JB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-2JB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-2JB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2131-2JB40, coupling relay for switching auxiliary circuits, 24 V DC coil, 3 NO instantaneous contacts, 10 A rated, S00 frame size, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"The coil pulls 2.8 W at 24 V DC and includes a built-in diode surge suppressor, so you don't need to add an external flyback diode on the coil circuit; just verify polarity before wiring. The S00 frame (70 mm high, 45 mm wide, 73 mm deep) fits alongside contactors and overload relays in the same SIRIUS family, so the rail layout stays uniform. The 10 A rating at both 24 V and 230 V AC is unusual — most relays derate at higher voltage. That means this part handles the same load current whether you're switching a 24 V DC pilot light or a 230 V AC contactor coil, so you don't oversize for the worst case. At DC the switching frequency is lower — 38 to 65 ms per cycle — which is typical for inductive DC loads where the arc extinguishes slower.","metaTitle":"Siemens 3RH2131-2JB40 SIRIUS Coupling Relay, 24 V DC, 3 NO,","metaDescription":"Siemens 3RH2131-2JB40 SIRIUS coupling relay, 24 V DC coil, 3 instantaneous NO contacts, 10 A rated, S00 size, snap-on DIN rail. Current production. Sourced to order.","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":"38 ... 65 ms","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.7","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":"1.25","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 ... 4 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Coupling relay for switching auxiliary circuits","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","Design Of The Surge Suppressor":"diode","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.8 W","holding power of magnet coil at DC":"2.8 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 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 ... 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 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","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":"$25.40","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=63992&mlfb=3RH2131-2JB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2131-2JB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RH2131-2JB40?","answer":"The 3RH2122-1WB40 is a peer in the same SIRIUS S00 family, but it has 2 NO + 2 NC contacts versus the 3 NO on the 3RH2131-2JB40. The coil voltage and mounting footprint are the same, so it drops into the same DIN-rail position without rewiring the rail — just verify the contact configuration matches your circuit logic."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-2JB40","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/3RH2131-2JB40 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}}