{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-2LF40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-2LF40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-2LF40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2LF40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2122-2LF40-1AA0 coupling relay for switching auxiliary circuits, size S00, 110 V rated coil, 2 instantaneous contacts, 45 mm width, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"## Active Production — SIRIUS Coupling Relay for Auxiliary Circuits The 3RH2122-2LF40-1AA0: It is designed for switching auxiliary circuits in control panels, motor starter assemblies, and PLC output isolation stages. The size S00 frame keeps the panel footprint tight — 45 mm wide, 70 mm tall, 121 mm deep — and it mounts via screw or snap-on onto standard 35 mm DIN rail. ## Switching Capacity Across the Voltage Range The 2 instantaneous contacts (2 NO configuration) are rated for 10 A at 24 V, 10 A at 230 V, 3 A at 110 V, 3 A at 400 V, and 1 A at 690 V. The 0.26 A rating at 600 V and 0.5 A at 440 V define the AC load envelope at higher line voltages — this is a signal-level auxiliary relay, not a power contactor. The varistor surge suppressor is built into the coil circuit, protecting downstream PLC or controller outputs from back-EMF when the relay de-energises. Coil closing power at DC is 2.8 W — within the drive capability of a standard 24 VDC PLC output. ## Mounting, Clearance, and Environmental Limits Mount the relay standing on a horizontal surface. Minimum clearances to adjacent components: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the sides. These spacings keep the arc quenching zone clear and prevent tracking in pollution degree 3 environments. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. The 10 % minimum relative humidity floor means the relay tolerates dry climates without seal degradation. Mechanical life is 30 million operations typical — the limiting factor is the contact wear under load, not the mechanism. ## Sourcing and Compliance RoHS compliance date is 10/01/2009 — the part meets the substance prohibitions effective from that date. The 2x (0.5 to 4 mm²) solid or stranded wire termination accepts standard control wiring without ferrule adapters.","metaTitle":"Siemens 3RH2122-2LF40-1AA0 SIRIUS Coupling Relay, 110 V","metaDescription":"Siemens 3RH2122-2LF40-1AA0 SIRIUS coupling relay, 110 V coil, 2 instantaneous contacts, 45 mm wide, active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"121 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 20 ms","title":"3RH2122-2LF40-1AA0","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"110 V","description":"Coupling contactor relay railway 2 NO + 2 NC, 110 V DC, 0.7... 1.25* US, with varistor integrated, Size S00, Spring-type terminal for 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":"2","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":"2","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/67a16758de39cc7f4622cdcdc0c9d50d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=265628&mlfb=3RH2122-2LF40-1AA0"},"ai":{"faq":[{"question":"What are the key switching ratings for 3RH2122-2LF40-1AA0?","answer":"The 2 NO contacts are rated 10 A at 24 V, 10 A at 230 V, 3 A at 110 V, 3 A at 400 V, and 1 A at 690 V. The coil is 110 V rated with a varistor surge suppressor built in."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-2LF40-1AA0","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/3RH2122-2LF40-1AA0 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}}