{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1KB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 24 V DC coil, 2 NO + 2 NC contacts, size S00, screw and snap-on DIN-rail mounting, IP20 front protection.","salesMarkdown":"The Siemens SIRIUS 3RH1122-1KB40 is a coupling relay purpose-built for switching auxiliary circuits in control panels. Rated 24 V DC coil with a contact rating of 10 A at 24 V, it provides two normally-open and two normally-closed instantaneous contacts (no make-before-break or delayed switching). The size S00 footprint — 45 mm wide, 57.5 mm tall, 72 mm deep — fits standard DIN-rail enclosures with screw and snap-on fastening. The 10 A at 24 V rating governs resistive switching at the coil voltage; for higher AC voltages the contact current derates sharply — 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. That derating curve means the part is sized for control-level loads (pilot lights, contactor coils, PLC inputs), not power circuits. The 2.3 W DC holding power keeps heat dissipation low inside a crowded enclosure — no forced cooling needed for a single unit. The built-in varistor surge suppressor snubs the DC coil's flyback voltage — no external free-wheel diode needed. Contact reliability is rated at one incorrect operation per 100 million cycles at 17 V, 1 mA, which matters for low-energy signal switching where oxide films can block conduction. Shock resistance is 10g for 5 ms and 5g for 10 ms, adequate for most industrial machinery but not heavy impact zones. The S00 contactor size is the smallest Siemens SIRIUS frame; it shares the same DIN footprint as the matching contactor 3RT2015, simplifying bus-bar and wiring planning.","metaTitle":"Siemens 3RH1122-1KB40 SIRIUS Coupling Relay, 24 V DC, 10 A,","metaDescription":"Siemens SIRIUS 3RH1122-1KB40 coupling relay for auxiliary circuits. Rated 24 V DC, 10 A. Size S00, IP20 front. Screw/snap-on DIN mount. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","Height":"57.5 mm","Rated Value":"24 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)":"01.07.2006 00:00:00","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","reference code acc. to IEC 81346-2":"K","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","with low demand rate acc. to SN 31920":"40 %","with high demand rate acc. to SN 31920":"75 %","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)","Touch Protection Against Electrical Shock":"finger-safe","Of Auxiliary Contacts Instantaneous Contact":"0","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","B10 value with high demand rate acc. to SN 31920":"1 000 000; With 0.3 x Ie","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":"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"}},"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=366896&mlfb=3RH1122-1KB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RH1122-1KB40?","answer":"The 3RH2122-1WB40 is a peer from the same SIRIUS family with the same 2 NO + 2 NC contact configuration and size S00 footprint. The key difference is the coil voltage: 3RH1122-1KB40 is 24 V DC, while 3RH2122-1WB40 uses a different coil rating. Verify coil compatibility before substituting."},{"question":"Will 3RH1122-1KB40 drop into a panel specified for 3RH2122-1WB40?","answer":"Yes — both are size S00 with the same 45 mm width, 57.5 mm height, 72 mm depth, and screw/snap-on DIN mounting. The physical fit is identical. The only difference is the coil voltage; 3RH1122-1KB40 runs on 24 V DC while the 3RH2122-1WB40 uses a different coil rating. Check your control voltage before swapping."},{"question":"Where can I buy 3RH1122-1KB40?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1KB40","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/3RH1122-1KB40 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}}