{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1122-1KF40-0LA4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1122-1KF40-0LA4","canonicalUrl":"https://aoctrl.com/siemens/3RH1122-1KF40-0LA4","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KF40-0LA4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1122-1KF40-0LA4 auxiliary contactor, size S00, 45 mm width, 2 NO + 2 instantaneous contacts, 110 V coil with varistor, screw and snap-on mounting, IP20 front protection.","salesMarkdown":"It provides 2 normally open and 2 normally closed instantaneous auxiliary contacts, with no delayed, lagging, or make-before-break switching functions — a straightforward 4-pole block for feedback or interlock duties. Screw and snap-on mounting means it clips onto the rail without tools but can also be screw-fixed for vibration-prone installations. The AC-12 maximum operating current is 10 A, which covers resistive control loads like contactor coils and indicator lamps. At 24 V the contacts are rated for 10 A, at 110 V for 1 A, at 230 V for 6 A, at 400 V for 3 A, at 500 V for 2 A, and at 690 V for 1 A — these are the current limits per pole at those voltages, so the actual load determines which rating applies. The coil is 110 V rated and includes a built-in varistor surge suppressor, which suppresses voltage spikes from the inductive coil when de-energized. Closing power is 11 W DC, holding power 4 W DC — the lower holding draw means the coil runs cooler once sealed. ## Environmental limits and mounting flexibility Side clearance is 0 mm, so units can be mounted flush side-by-side without derating for heat buildup. Shock resistance is 10g for 5 ms and 5g for 10 ms, which covers most industrial vibration from contactors and starters in the same panel. ## Wiring and terminal capacity The terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and 2x 4 mm². This covers standard control wiring from signal-level to power-feed sizes, and the dual-conductor capacity allows looping through without a separate terminal block.","metaTitle":"Siemens 3RH1122-1KF40-0LA4 SIRIUS Auxiliary Contactor, 45mm,","metaDescription":"Siemens SIRIUS 3RH1122-1KF40-0LA4 auxiliary contactor, size S00, 45mm wide, 10A AC-12, 110V coil, 2 NO + 2 NC, screw/snap-on mount, IP20. Current lifecycle stage.","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":"Yes","During Operation":"-40 ... +70 °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":"+/-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","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":"70 %","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":"1","Number of NO contacts for auxiliary contacts":"2","with degree of pollution 3 at AC rated value":"690 V","Type of voltage of the control supply voltage":"DC","Identification number and letter for switching elements":"21 E","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Of The Contactor With Added Electronics-Compatible Auxiliary Switch Block Typical":"5 000 000"}},"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=331872&mlfb=3RH1122-1KF40-0LA4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1122-1KF40-0LA4/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for this auxiliary contactor?","answer":"The 3RT1015 series contactors share the same S00 frame size and mounting footprint, but they are power contactors rather than dedicated auxiliary contactors. The 3RH1122-1KF40-0LA4 is the correct auxiliary contactor for applications requiring 2 NO + 2 NC auxiliary contacts without main power poles. A 3RT1015 would need an auxiliary contact block added to match the contact configuration, and the coil voltage must be verified separately."},{"question":"What are the key dimensions for panel layout?","answer":"Width is 45 mm, height is 57.5 mm, and depth is 72 mm. Side clearance is 0 mm for flush mounting. The contactor mounts via screw or snap-on to DIN rail."},{"question":"What wire sizes does this contactor accept?","answer":"Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and 2x 4 mm². This allows looping two conductors per terminal for daisy-chaining control circuits."},{"question":"What is the rated switching capacity at different voltages?","answer":"AC-12 maximum is 10 A. At 24 V the contacts are rated for 10 A, at 110 V for 1 A, at 230 V for 6 A, at 400 V for 3 A, at 500 V for 2 A, and at 690 V for 1 A. The coil is 110 V rated with a built-in varistor surge suppressor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1122-1KF40-0LA4","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/3RH1122-1KF40-0LA4 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}}