{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1QB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1QB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1QB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1QB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2122-1QB40, coupling relay for switching auxiliary circuits, S00 size, 24 VDC coil, 10 A rated, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"## SIRIUS coupling relay, S00 size — 24 VDC coil, 10 A rated The Siemens 3RH2122-1QB40 is a SIRIUS coupling relay sized for auxiliary circuit switching, built on the S00 contactor footprint. The 45 mm wide body snaps onto standard 35 mm DIN rail or screws directly to a backplate, with ±180° rotation possible on vertical mounting surfaces and ±22.5° tilt forward/backward. Rated operational current drops with voltage: 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 10 A at 230 V, 3 A at 400 V, 0.5 A at 440 V, 2 A at 500 V, 0.26 A at 600 V, and 1 A at 690 V — so the 10 A figure is specific to the 24 V and 230 V levels. The 2 NO + 2 NC instantaneous contact arrangement gives you two form C (changeover) sets for control logic or status feedback. ## Panel integration — DIN rail, clearances, wiring The S00 body is 57.5 mm high, 45 mm wide, 73 mm deep. Wiring terminals accept 2× (0.5 to 1.5 mm²), 2× (0.75 to 2.5 mm²), or 2× 4 mm² solid or stranded conductors.","metaTitle":"Siemens 3RH2122-1QB40 SIRIUS Coupling Relay, 24 VDC, 10 A","metaDescription":"Siemens SIRIUS 3RH2122-1QB40 coupling relay, 24 VDC coil, 10 A rated, S00 size, screw and snap-on DIN rail mount. Sourced to order against RFQ.","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","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","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 DIN 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 ... 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":"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","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 ... 16), 2x (18 ... 14), 2x 12","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":"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":"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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/83640d309373fc1762e404acd21cae97.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=499606&mlfb=3RH2122-1QB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1QB40/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 3RH2122-1QB40?","answer":"The depth is 73 mm, with a width of 45 mm and height of 57.5 mm, fitting the S00 contactor footprint."},{"question":"Will 3RH2122-1QB40 drop into a panel designed for 3RH2122-1WB40 without rewiring?","answer":"Both are S00-size SIRIUS coupling relays with the same 45 mm width and DIN-rail mounting, so the mechanical fit is identical. The difference is the coil voltage: the 1QB40 is 24 VDC, while the 1WB40 is a different coil variant. If the control voltage matches, no rewiring is needed beyond verifying the coil supply."},{"question":"Where can I buy the 3RH2122-1QB40?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for your quantity and delivery window."},{"question":"What compliance documentation does Siemens provide for the 3RH2122-1QB40?","answer":"The part carries a substance prohibition date of 10/01/2009, indicating RoHS compliance. The SIRIUS series typically supports CE, UL, CSA, and IEC 60947 certifications — confirm the specific declarations with your order documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1QB40","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/3RH2122-1QB40 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}}