{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-2JB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-2JB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-2JB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2JB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH2122-2JB40, size S00, 2 NO instantaneous contacts, 24 VDC coil with diode suppression, screw and snap-on 35 mm rail mounting, 73 x 45 x 70 mm.","salesMarkdown":"The Siemens 3RH2122-2JB40 is a SIRIUS coupling relay — size S00 — designed to switch auxiliary circuits in control panels. It carries 2 instantaneous NO contacts rated 10 A at 24 V and 230 V, 3 A at 400 V, and 1 A at 690 V, so it handles mixed-voltage auxiliary loads from a single 24 VDC coil. The built-in diode surge suppressor clips the flyback spike on the coil, which keeps the DC supply clean and protects adjacent PLC outputs or safety relays. The 45 mm width and 73 mm depth fit the S00 footprint — common in Siemens SIRIUS contactor assemblies. Mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward/backward. ## Wiring and thermal limits Terminals accept 2 x 0.5 to 4 mm² solid or stranded wire. Operating temperature range is -25 to +60 °C; storage range -55 to +80 °C. The 10 000 operations per hour at AC and 38–65 ms at DC switching frequency means it keeps up with fast-cycle auxiliary loads like valve position feedback or conveyor zone control.","metaTitle":"Siemens 3RH2122-2JB40 SIRIUS Coupling Relay, 2 NO Contacts,","metaDescription":"Siemens 3RH2122-2JB40 SIRIUS coupling relay, 2 instantaneous NO contacts, 24 VDC coil, 10 A at 24 V. Screw/snap-on 35 mm rail. Quoted to order.","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":"38 ... 65 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":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","Full-Scale Value":"1.25","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":"2","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"diode","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":"22 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a167a04bceadb40ae4d774495b7575b7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=205075&mlfb=3RH2122-2JB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2JB40/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RH2122-2JB40?","answer":"Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through independent distribution channels."},{"question":"What is 3RH2122-2JB40's listed depth (73 mm) on this component line?","answer":"The depth is 73 mm, width 45 mm, height 70 mm — the standard S00 footprint for Siemens SIRIUS auxiliary contactors."},{"question":"Will 3RH2122-2JB40 drop into a panel that was specified around 3RH2122-1WB40 without rewiring?","answer":"The 3RH2122-2JB40 shares the same S00 footprint, 35 mm rail mounting, and screw terminals as the 1WB40 variant. The key difference is the coil voltage — this is 24 VDC with diode suppression, while the 1WB40 is a different coil variant. If the panel was wired for a 24 VDC coil, it drops in without rewiring."},{"question":"What compliance documentation does this brand provide for 3RH2122-2JB40 (RoHS, REACH, UL, IEC)?","answer":"The part carries RoHS compliance with a substance prohibition date of 10/01/2009. As a Siemens SIRIUS product, standard documentation includes CE declaration of conformity and IEC/EN 60947-5-1 certification. UL and CSA listings are typical for this series but should be confirmed against the specific nameplate marking on the unit received."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-2JB40","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/3RH2122-2JB40 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}}