{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-2KF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-2KF40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-2KF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH1122-2KF40, size S00, 110 V coil, 2 NO + 2 NC contacts, screw and snap-on mounting, IP20 front.","salesMarkdown":"The Siemens 3RH1122-2KF40 is a SIRIUS coupling relay designed for switching auxiliary circuits in control panels. It's a size S00 contactor relay, meaning it shares the same compact footprint as the S00 contactor family — 45 mm wide, 60 mm tall, 73 mm deep — so it slots into the same DIN-rail layout without stealing extra panel real estate. That's a lot of freedom for tight enclosures where you're working around existing wiring. The coil is rated 110 V — that's the pull-in and hold voltage. Closing power is 2.3 W DC, and holding power is the same 2.3 W DC, so the coil doesn't waste extra energy once it's sealed. A varistor is built in for surge suppression, which saves you from adding an external snubber on the coil. Contact ratings are given at multiple voltages, which tells you the switching capacity across common control voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. At 110 V — the coil voltage — the contact rating is 1 A. These are thermal current ratings for the auxiliary contacts; the actual making/breaking capacity depends on your load type (resistive vs. inductive), but these numbers give you the thermal limit. The relay carries 2 normally-open and 2 normally-closed instantaneous contacts — no delayed, lagging, or make-before-break options on this variant. Contact reliability is specified as one incorrect switching operation per 100 million cycles at 17 V, 1 mA, which covers dry-circuit (low-energy) switching where oxide films can cause trouble. Shock resistance is 10g / 5 ms and 5g / 10 ms — fine for most industrial machinery but not extreme shock applications. Substance prohibitance date is July 1, 2006 — that's the RoHS compliance cutoff. The part is designed to meet RoHS requirements for substances like lead, mercury, and cadmium. Terminals accept solid wire from 0.25 mm² up to 2.5 mm², two conductors per terminal. That covers standard control wiring (1.5 mm² is typical for 24 V DC circuits). The screw terminals are standard for the SIRIUS family — no special tooling needed.","metaTitle":"Siemens 3RH1122-2KF40 SIRIUS Coupling Relay, 110 V coil, 10","metaDescription":"Siemens 3RH1122-2KF40 SIRIUS coupling relay for switching auxiliary circuits. 110 V coil, 10 A at 24 V, IP20 front, screw/snap-on mount. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","Rated Value":"110 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.25","Shock Resistance":"10g / 5 ms and 5g / 10 ms","Delayed Switching":"0","Lagging Switching":"0","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","Product Brand Name":"SIRIUS","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 1 mA)","Degree Of Pollution":"3","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"10 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.27 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"2 A","at 690 V rated value":"1 A","Instantaneous Contact":"2","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.3 W","holding power of magnet coil at DC":"2.3 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","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","Identification Number And Letter For Switching Elements":"22 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Type Of Electrical Connection For Auxiliary And Control Circuit":"Cage Clamp 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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/abbcd400092b7a647fd330185a2af01a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=70837&mlfb=3RH1122-2KF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KF40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this coupling relay?","answer":"110 V coil with 2.3 W DC closing and holding power. Contacts rated 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. Two NO and two NC instantaneous contacts. Built-in varistor surge suppression."},{"question":"What wire sizes does the 3RH1122-2KF40 accept?","answer":"Solid wire from 0.25 mm² to 2.5 mm², two conductors per terminal. Standard screw terminals."},{"question":"What is the mounting position flexibility?","answer":"±180° rotation possible on a vertical mounting surface, and can be tilted forward and backward by ±22.5° on a vertical mounting surface. Mounts via screw or snap-on onto DIN rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-2KF40","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/3RH1122-2KF40 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}}