{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-2KM40-0LA4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-2KM40-0LA4","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-2KM40-0LA4","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KM40-0LA4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary contactor, size S00, 4-pole, 220 V AC coil, screw and snap-on mounting, IP20 front protection, with varistor surge suppression.","salesMarkdown":"That means you can orient it to fit tight enclosure layouts without worrying about gravity affecting the armature. Pollution degree 3 rating confirms it's built for conductive-dust environments typical in industrial panels. The 4-pole contactor has 2 normally open (instantaneous) contacts and 2 normally closed contacts — no make-before-break or delayed switching here, so it's a straightforward interlock or signal repeater. The rated switching currents vary by voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. That derating curve follows the arc-extinction capability at higher voltages. For a 24 VDC control circuit, the 10 A rating gives you headroom for a bank of pilot lights or PLC outputs. ## Coil and surge suppression The 220 V AC coil draws 11 W during pickup and holds at 4 W — that's a standard inrush-to-hold ratio for AC-operated contactors. The built-in varistor clamps voltage spikes from the coil's magnetic field collapse, which extends the life of the coil and reduces EMI on the control transformer. If you're replacing a contactor that had an external RC snubber, this part eliminates that component.","metaTitle":"Siemens 3RH1122-2KM40-0LA4 SIRIUS Auxiliary Contactor, 4-pol","metaDescription":"Siemens SIRIUS 3RH1122-2KM40-0LA4 auxiliary contactor, size S00. 4-pole, 220 V AC coil with varistor. IP20 front. Screw/snap-on DIN mount. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"123 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","Rated Value":"220 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 (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":"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":"Cage Clamp 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=309594&mlfb=3RH1122-2KM40-0LA4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KM40-0LA4/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1122-2KM40-0LA4 and get a price?","answer":"This part is sourced to order through independent distribution channels. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What compliance documentation does this part carry?","answer":"RoHS compliance is dated July 1, 2006. The part carries IP20 front protection and pollution degree 3 rating. The SIRIUS series typically provides UL, CSA, and CE declarations; verify with your local Siemens support for specific certificates tied to this order code variant."},{"question":"What is the depth of 3RH1122-2KM40-0LA4?","answer":"The depth is 123 mm, with a width of 45 mm and height of 60 mm — the standard S00 contactor footprint."},{"question":"What wire size does the terminal accept?","answer":"The solid-wire terminals accept 2x (0.25 to 2.5 mm²) — that covers standard control wiring from 24 AWG to 14 AWG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-2KM40-0LA4","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/3RH1122-2KM40-0LA4 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}}