{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1KN40-0LA4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1KN40-0LA4","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1KN40-0LA4","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KN40-0LA4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH1122-1KN40-0LA4, 45 mm width, 2 NO + 2 NC contacts, 250 V rated, IP20 front, screw and snap-on mounting.","salesMarkdown":"The Siemens 3RH1122-1KN40-0LA4 is a SIRIUS auxiliary contactor in the S00 frame size — the smallest footprint in the SIRIUS contactor family, at 45 mm wide, 57.5 mm tall, and 72 mm deep. It carries 2 normally-open and 2 normally-closed instantaneous contacts, rated at 250 V, with a built-in varistor surge suppressor across the DC coil. The coil draws 11 W on closing and holds at 4 W. The contact ratings vary significantly with voltage, which is typical for DC switching. At 24 V the contacts handle 10 A; at 110 V they drop to 1 A; at 220 V it's 0.27 A. For AC loads the picture is different: at 230 V it's 6 A, at 400 V it's 3 A, at 500 V it's 2 A, and at 690 V it's 1 A. If you're switching milliamps, this contactor won't give you headaches. Keep it inside the enclosure, not on the panel door. Screw terminals accept 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid conductors. That covers most control wiring up to 4 mm² — enough for the coil supply and contact wiring. The S00 size (45 mm wide) is the standard auxiliary contactor footprint; it shares the same DIN-rail pitch as the main SIRIUS contactors in the same frame size, so it stacks cleanly next to a 3RT2 contactor. Shock resistance is 10g for 5 ms and 5g for 10 ms — fine for industrial cabinet mounting on a machine base.","metaTitle":"Siemens 3RH1122-1KN40-0LA4 SIRIUS Auxiliary Contactor, S00,","metaDescription":"Siemens SIRIUS auxiliary contactor 3RH1122-1KN40-0LA4, size S00, 45 mm width, 2 NO + 2 NC contacts, 250 V rated, 10 A at 24 V, IP20, screw/snap-on mount. Active production. Quoted","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":"250 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-40 ... +70 °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":"Auxiliary contactor","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":"Yes","closing power of magnet coil at DC":"11 W","holding power of magnet coil at DC":"4 W","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","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)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"70 %","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"21 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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","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"}},"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=31852&mlfb=3RH1122-1KN40-0LA4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KN40-0LA4/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1122-1KN40-0LA4 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the closest functional second-source to 3RH1122-1KN40-0LA4?","answer":"The 3RH2122-1BW40 is a direct functional peer in the same SIRIUS auxiliary contactor family but in a larger S0 frame size — it has a wider body and different mounting footprint, so it won't drop into a panel wired for the S00 without rewiring or a different DIN-rail adapter."},{"question":"What compliance documentation does this brand provide for 3RH1122-1KN40-0LA4?","answer":"RoHS compliance is confirmed with a substance prohibition date of 07/01/2006. Standard Siemens SIRIUS documentation includes CE declarations, UL/CSA certifications, and a full datasheet with CAD files."},{"question":"What are the key specs of 3RH1122-1KN40-0LA4?","answer":"It is a SIRIUS auxiliary contactor, size S00, with 2 NO + 2 NC instantaneous contacts, rated 250 V, 10 A at 24 VDC. Width 45 mm, height 57.5 mm, depth 72 mm. Screw/snap-on mounting, IP20 front, built-in varistor surge suppression."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1KN40-0LA4","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/3RH1122-1KN40-0LA4 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}}