{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-1MB40-0KT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-1MB40-0KT0","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-1MB40-0KT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1MB40-0KT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2131-1MB40-0KT0 coupling relay for switching auxiliary circuits, Size S00, 24 VDC coil, 3 NO instantaneous contacts, 10 A at 24 V AC, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"The Siemens 3RH2131-1MB40-0KT0 is a SIRIUS coupling relay — a compact auxiliary contactor built for switching control circuits, not motor loads. It gives you three normally-open instantaneous contacts rated at 10 A at 24 V AC, with the coil pulling 1.6 W DC to close and hold. Size S00 means it fits the same 45 mm wide footprint as the smallest SIRIUS contactors, so it tucks into crowded control panels alongside the main power contactors without wasting rail space. ## Switching ratings across the voltage range — what actually matters Those lower currents at higher voltages reflect the arc-quenching limits of the contact gap — the 600 V rating is there for signal-level isolation, not for power switching. ## Mounting and spacing — clearances for the wireman The 73 mm depth includes the terminals, so budget that plus finger space when laying out the backplane. The degree of pollution 3 rating means it's suitable for industrial enclosures where conductive dust or occasional condensation is expected. ## Lifecycle and sourcing — what you need to know for the BOM RoHS compliance date is marked as 10/01/2009, and the storage temperature range of -55 to +80 °C covers most warehouse conditions. The operating ambient is -25 to +50 °C, which is typical for indoor control panels without direct heat sources nearby.","metaTitle":"Siemens 3RH2131-1MB40-0KT0 SIRIUS Coupling Relay, 24 VDC","metaDescription":"Siemens 3RH2131-1MB40-0KT0 SIRIUS coupling relay, 24 VDC coil, 10 A switching at 24 V. Size S00, 3 NO contacts, DIN rail mount. Current production.","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":"3RH2131-1MB40-0KT0","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":"24 V","description":"Coupling contactor relay, 3 NO + 1 NC 24 V DC, 0.85... 1.85* US, Size S00, screw 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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 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 ... 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","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","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/5d39e445670a012d87ba85b283d43d28.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=327338&mlfb=3RH2131-1MB40-0KT0"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-1MB40-0KT0","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/3RH2131-1MB40-0KT0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}