{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-2LB40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-2LB40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-2LB40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-2LB40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2131-2LB40-1AA0 coupling relay, size S00, 3 NO instantaneous contacts, 24 VDC coil with integrated varistor, screw and snap-on mounting for 35 mm DIN rail.","salesMarkdown":"## S00 frame coupling relay for auxiliary circuit isolation The 3RH2131-2LB40-1AA0 is a SIRIUS coupling relay in the S00 frame size — the smallest contactor chassis in the Siemens industrial controls family, sized for auxiliary circuits rather than main motor power. Its three instantaneous NO contacts switch 10 A at both 24 V and 230 V rated values, covering DC-13 solenoid loads and AC-15 contactor coils in the same device. The 24 VDC coil draws 2.8 W closing power and includes a built-in varistor surge suppressor, eliminating the need for an external flyback diode or RC snubber across the coil terminals. ## Panel fit and clearance planning Minimum clearances of 10 mm upwards, forwards, and downwards, plus 6 mm at the side, must be maintained to adjacent devices for arc flash containment and cooling airflow. ## Switching performance and environmental limits Mechanical service life is 30,000,000 operations typical, meaning the contact wear mechanism — not the coil or armature — sets the replacement interval in high-cycle applications. Pollution degree 3 rating confirms suitability for industrial enclosures where conductive dust is present. Sourced through the authorized Siemens channel; quantities are quoted to order against the BOM with full factory traceability and warranty.","metaTitle":"Siemens 3RH2131-2LB40-1AA0 SIRIUS Coupling Relay, 3 NO","metaDescription":"Siemens 3RH2131-2LB40-1AA0 SIRIUS coupling relay, S00 frame, 3 NO contacts, 24 VDC coil with varistor. Rated 10 A at 24 V / 230 V.","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 ... 20 ms","title":"3RH2131-2LB40-1AA0","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 railway 3 NO + 1 NC, 24 V DC, 0.7... 1.25* US, with varistor integrated, Size S00, Spring-type terminal upright mounting position","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 standard mounting rail","Full-Scale Value":"1.25","Mounting Position":"standing, on horizontal 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":"with varistor","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4896c4123e2dad04d963e61cb0d1c1bb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=463439&mlfb=3RH2131-2LB40-1AA0"},"ai":{"faq":[{"question":"What panel clearances are needed around this relay?","answer":"Minimum 10 mm clearance upwards, forwards, and downwards from the relay body, plus 6 mm at the sides. These gaps prevent arc flash propagation and allow cooling airflow between adjacent devices on the DIN rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-2LB40-1AA0","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/3RH2131-2LB40-1AA0 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}}