{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1KF40-2AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1KF40-2AA0","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1KF40-2AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KF40-2AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1122-1KF40-2AA0, size S00 auxiliary contactor, 110 V DC coil, 10 A AC-12 rated, 2 NO contacts, built-in varistor, screw and snap-on mounting, IP20 front.","salesMarkdown":"It carries a 110 V DC coil with built-in varistor suppression, so you don't need to add an external snubber on the coil wiring. The 2 NO instantaneous contacts are rated 10 A in AC-12 duty (resistive loads at up to 690 V), which covers most PLC output and relay interface applications you'd throw at it in a control cabinet. Mounting is screw or snap-on onto a DIN rail — the 45 mm width and 57.5 mm height fit the standard S00 slot alongside contactors like the 3RT10 series. The 10 A AC-12 rating is the headline figure — that's the maximum continuous current through the auxiliary contacts when switching resistive loads. At 110 V DC the contacts are rated 1 A, and at 230 V AC they handle 6 A. The 690 V AC rating drops to 1 A, so if you're switching a 690 V control transformer secondary, derate accordingly. These numbers are the contact limits; the coil draw is only 11 W closing and 4 W holding, so the control transformer sizing is negligible. The built-in varistor clamps the coil voltage spike when de-energizing — that's a reliability plus for PLC outputs driving the coil directly. No external diode or RC snubber needed across the coil terminals. Shock resistance is 10g / 5 ms and 5g / 10 ms, which is standard for industrial panel gear — no special handling needed for shipping or vibration. Terminals accept 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm² solid — covers most control-circuit wire sizes you'd run in a panel. Stripping length is standard; spring-cage or screw terminals depending on the variant, but this order code comes with screw terminals.","metaTitle":"Siemens SIRIUS 3RH1122-1KF40-2AA0 Auxiliary Contactor, 110 V","metaDescription":"Siemens SIRIUS auxiliary contactor 3RH1122-1KF40-2AA0, size S00, 110 V DC coil, 10 A AC-12, 2 NO + 0 NC, built-in varistor, IP20, current production. Sourced 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","Maximum":"2 000 m","At The Side":"0 mm","Rated Value":"110 V","On The Front":"IP20","Initial Value":"0.7","Mounting type":"screw and snap-on mounting","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","Auxiliary switch":"No","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Full-scale value":"1.25","Shock resistance":"10g / 5 ms and 5g / 10 ms","Delayed Switching":"0","Lagging Switching":"0","Mounting position":"hanging, on horizontal mounting surface","Size of contactor":"S00","Product brand name":"SIRIUS","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","Design of the surge suppressor":"with varistor","Closing power of magnet coil at DC":"11 W","Holding power of magnet coil at DC":"4 W","Operating current at AC-12 maximum":"10 A","Surge voltage resistance rated value":"6 kV","Reference code acc. to DIN EN 61346-2":"K","Reference code acc. to DIN EN 81346-2":"K","with low demand rate acc. to SN 31920":"40 %","With Degree Of Pollution 3 Rated Value":"690 V","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)","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","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","Identification number and letter for switching elements":"22 E","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=161931&mlfb=3RH1122-1KF40-2AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KF40-2AA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this auxiliary contactor?","answer":"The 3RH1122-1KF40-2AA0 is a size S00 auxiliary contactor with a 110 V DC coil, 2 NO contacts rated 10 A in AC-12 duty, and built-in varistor surge suppression. Contact ratings vary by voltage: 1 A at 110 V DC, 6 A at 230 V AC, 3 A at 400 V AC, and 1 A at 690 V AC."},{"question":"Does this part drop into a panel designed for a 3RT1015 contactor?","answer":"Yes — the 3RH1122-1KF40-2AA0 shares the same S00 footprint (45 mm width, 57.5 mm height) and DIN-rail mounting pattern as the 3RT1015 series contactors. It's designed as the auxiliary contact block companion for those contactors, so it fits the same panel layout without rewiring the mounting."},{"question":"What compliance documentation is available for this part?","answer":"As a Siemens SIRIUS product, the 3RH1122-1KF40-2AA0 carries CE marking for the European market and is designed to meet IEC/EN 60947 standards for low-voltage switchgear. RoHS and REACH compliance declarations are standard from Siemens for this series. Specific UL/CSA file numbers are typically listed on the manufacturer's certificate of compliance for this catalog number."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1KF40-2AA0","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/3RH1122-1KF40-2AA0 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}}