{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-2MB40-0KT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-2MB40-0KT0","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-2MB40-0KT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-2MB40-0KT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2131-2MB40-0KT0 coupling relay for switching auxiliary circuits, S00 frame size, 3 instantaneous contacts, 10 A at 24 V rated, 45 mm width, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## Auxiliary circuit coupling relay, S00 frame The Siemens 3RH2131-2MB40-0KT0 is a SIRIUS coupling relay designed for switching auxiliary circuits — it handles the logic-level and pilot-duty loads that the main contactor's auxiliary contacts might not cover, or that need electrical isolation from the power circuit. Rated 10 A at both 24 V and 230 V, it carries three instantaneous contacts that close without delay, so it suits interlocking, status feedback, and PLC input isolation in a motor control centre. The coil consumes 1.6 W DC for both closing and holding — the same figure means no inrush spike to size the control transformer around, and the holding power stays low enough to keep the panel temperature rise within the enclosure's thermal budget. ## DIN-rail fit and panel clearance Width is 45 mm, depth 73 mm, height 70 mm — the S00 frame occupies three standard 15 mm DIN-rail module positions, so a row of these relays packs tightly without wasted rail space. A panel designer who ignores the 6 mm side clearance risks tracking across the pollution layer (pollution degree 3) under humid conditions. ## Environmental and compliance envelope RoHS substance prohibition date is 10/01/2009 — the relay complies with the EU RoHS directive as amended, and the date is the compliance cut-off, not a production end date.","metaTitle":"Siemens 3RH2131-2MB40-0KT0 SIRIUS Coupling Relay, 10 A, 24 V","metaDescription":"Siemens 3RH2131-2MB40-0KT0 SIRIUS coupling relay, 10 A at 24 V, 3 instantaneous contacts, S00 size, 45 mm wide, screw and snap-on 35 mm DIN rail.","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":"5 ... 20 ms","title":"3RH2131-2MB40-0KT0","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","description":"Coupling contactor relay, 3 NO + 1 NC 24 V DC, 0.85... 1.85* US, Size S00, Spring-type terminal","Initial Value":"0.85","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +50 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","Full-Scale Value":"1.85","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","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"1.6 W","holding power of magnet coil at DC":"1.6 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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e6e9a1f70e45b1c2b6784609126a2ae0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=492612&mlfb=3RH2131-2MB40-0KT0"},"ai":{"faq":[{"question":"What are the key ratings of 3RH2131-2MB40-0KT0?","answer":"The coil consumes 1.6 W DC for both closing and holding. The S00 frame size measures 45 mm wide, 73 mm deep, 70 mm high."},{"question":"What compliance documentation does Siemens provide for 3RH2131-2MB40-0KT0?","answer":"The relay carries a RoHS substance prohibition date of 10/01/2009, confirming compliance with the EU RoHS directive. Standard Siemens documentation includes a CE declaration of conformity and the product datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-2MB40-0KT0","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/3RH2131-2MB40-0KT0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}