{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-2LB40-2LA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-2LB40-2LA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-2LB40-2LA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2LB40-2LA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, 3RH2122-2LB40-2LA0, size S00, 24 VDC coil, 10 A rated current, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"It carries a 24 VDC coil and is rated for 10 A at 24 V (AC-15 / DC-13 duty), so it handles typical PLC output loads, relay coils, and signal lamps in a control panel. The S00 footprint — 45 mm wide, 70 mm tall, 116 mm deep — fits alongside contactors in the same rail section. ## Ratings and performance Coil closing power is 13 W at DC, with a built-in varistor surge suppressor across the coil — no external flyback diode needed for DC switching. Mechanical life is typical 30 million operations; switching frequency up to 10,000 cycles per hour at AC.","metaTitle":"Siemens 3RH2122-2LB40-2LA0 SIRIUS Auxiliary Contactor, 24 VD","metaDescription":"Siemens SIRIUS 3RH2122-2LB40-2LA0 auxiliary contactor, 24 VDC coil, 10 A rated, S00 size. Current production. Available to order. RoHS compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"116 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 20 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":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.25","Mounting Position":"hanging, 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":"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":"2","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"13 W","holding power of magnet coil at DC":"4 W","Surge Voltage Resistance Rated Value":"6 kV","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","for AWG cables for auxiliary contacts":"2x (20 ... 12)","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":"2","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":"21","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":"spring-loaded 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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=382967&mlfb=3RH2122-2LB40-2LA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2LB40-2LA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2122-2LB40-2LA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RH2122-2LB40-2LA0 drop into a panel specified around 3RH2122-1BA40 without rewiring?","answer":"Both are S00 size auxiliary contactors with the same DIN-rail footprint and terminal arrangement, so mechanical fit is identical. The key difference is the coil voltage: the -2LB40-2LA0 runs on 24 VDC, while the -1BA40 is a different coil variant. If the panel was wired for 24 VDC, it drops in without rewiring."},{"question":"What compliance documentation does this part have?","answer":"RoHS compliant with substance prohibition date 10/01/2009. The SIRIUS series typically carries UL, CSA, and CE certifications, though specific approvals are not listed in this evidence set."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-2LB40-2LA0","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/3RH2122-2LB40-2LA0 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}}