{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-2KB40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-2KB40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-2KB40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KB40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary contactor, 3RH1122-2KB40-1AA0, size S00, 24 V DC coil, 4 NO + 2 NC contacts, 10 A rated current.","salesMarkdown":"## What It Is & What It Does The 3RH1122-2KB40-1AA0 is a Siemens SIRIUS auxiliary contactor in size S00, designed to switch control circuits rather than motor loads — it extends the contact count of a main contactor or provides isolated signal feedback to a PLC. It carries 4 normally-open and 2 normally-closed instantaneous contacts, all rated for 10 A at 24 V, with a contact reliability of one incorrect operation per 100 million cycles at 17 V, 1 mA — meaning it's dependable for low-energy PLC inputs without wetting current issues. Depth is 73 mm, which leaves clearance behind the DIN rail for wiring; the spring-cage terminals accept 0.25 to 2.5 mm² solid or ferruled stranded wire, so no special crimp tooling is needed for standard control wiring. ## Contact Ratings & Application The contacts are rated for switching at multiple 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 — these are the thermal current ratings for the contact block, so they handle control transformer secondaries and PLC output loads across common line voltages. Built-in varistor surge suppression across the coil handles the inductive kick from the DC coil, so you don't need an external flyback diode — just wire the coil and go. Shock resistance is 10g for 5 ms and 5g for 10 ms, which covers most vibration from contactors and breakers in the same panel. RoHS compliance date is July 1, 2006 — the part meets the original RoHS directive, which is the standard for most industrial equipment sold today.","metaTitle":"Siemens 3RH1122-2KB40-1AA0 SIRIUS Auxiliary Contactor, 24 V","metaDescription":"Siemens SIRIUS 3RH1122-2KB40-1AA0 auxiliary contactor, size S00, 24 V DC coil, 4 NO + 2 NC contacts, 10 A rated current. Active production, sourced to order.","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":"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":"standing, on horizontal 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":"No","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":"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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=86453&mlfb=3RH1122-2KB40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-2KB40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 3RH1122-2KB40-1AA0?","answer":"The 3RT1015-1BB42 is a SIRIUS contactor in the same S00 frame size, but it's a main contactor with a 24 V DC coil and different contact configuration — it won't drop in as a direct replacement for this auxiliary contactor without rewiring the control circuit."},{"question":"What are the key ratings for the 3RH1122-2KB40-1AA0?","answer":"It has a 24 V DC coil, 4 NO + 2 NC contacts rated 10 A at 24 V, 6 A at 230 V, and 1 A at 690 V, with built-in varistor surge suppression and IP20 front protection."},{"question":"What wire sizes does the 3RH1122-2KB40-1AA0 accept?","answer":"The spring-cage terminals accept 0.25 to 2.5 mm² solid or ferruled stranded wire, which covers standard control wiring sizes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-2KB40-1AA0","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/3RH1122-2KB40-1AA0 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}}