{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2344-1DM40-0KA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2344-1DM40-0KA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2344-1DM40-0KA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2344-1DM40-0KA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, Size S00, 4 NO instantaneous contacts, 24 V DC coil with varistor, screw and snap-on mounting on 35 mm DIN rail, 117 x 45 x 57.5 mm.","salesMarkdown":"The Siemens 3RH2344-1DM40-0KA0 is a SIRIUS auxiliary contactor, Size S00, with 4 instantaneous normally open contacts. It is designed to switch control circuits — signalling, interlocking, and logic-level loads — in motor starter and contactor assemblies where the main contactor's own auxiliary contacts are already consumed or where additional isolated contact sets are needed. The coil is rated 24 V DC with an integrated varistor surge suppressor, closing power of 4 W. The rated control supply voltage is 220 V, with an operating range of 0.8 to 1.1 times the rated value — meaning the coil must see at least 176 V and no more than 242 V to pick and hold reliably. Mechanical endurance is rated at 10,000,000 operating cycles, and the AC switching frequency is 10,000 operations per hour. The 4 NO contacts carry rated operational currents that vary with voltage, reflecting the switching capacity across different control voltages. At 24 V the contacts are rated 10 A; at 60 V, 4.7 A; at 110 V, 3 A; at 220 V, 1.2 A; at 230 V, 6 A; at 400 V, 3 A; at 440 V, 0.5 A; at 500 V, 2 A; at 600 V, 0.26 A; and at 690 V, 1 A. These are not continuous thermal currents — they are switching ratings per IEC/EN 60947-5-1 for utilization categories typical of control circuits. The 10 A at 24 V, for example, covers most PLC output and relay loads; the 1.2 A at 220 V is adequate for signalling a contactor coil or indicator lamp. The drop at 600 V to 0.26 A reflects the reduced switching capacity at higher voltages for the same contact gap. The Size S00 footprint is 45 mm wide, 57.5 mm tall, and 117 mm deep — a compact envelope that fits alongside S00 contactors in a motor starter row. Conductor cross-sections accepted: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm², solid or stranded. Relative humidity minimum is 10%. No auxiliary switch extension is available on this variant; the 4 NO contacts are fixed. The product designation is auxiliary contactor, not a main power contactor — it switches control circuits, not motor loads.","metaTitle":"Siemens 3RH2344-1DM40-0KA0 SIRIUS Auxiliary Contactor, 4 NO,","metaDescription":"Siemens 3RH2344-1DM40-0KA0 SIRIUS auxiliary contactor, Size S00, 4 instantaneous NO contacts, 24 V DC coil with varistor, screw and snap-on mounting. Current lifecycle stage. Sourc","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"117 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"220 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","Full-Scale Value":"1.1","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","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 440 V rated value":"0.5 A","at 500 V rated value":"2 A","at 600 V rated value":"0.26 A","at 690 V rated value":"1 A","Instantaneous Contact":"4","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"4 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), 2x 12","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","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)","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","number of NC contacts for auxiliary contacts":"4","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Identification Number And Letter For Switching Elements":"44 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"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=322387&mlfb=3RH2344-1DM40-0KA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2344-1DM40-0KA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2344-1DM40-0KA0 and how is it quoted?","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":"Will 3RH2344-1DM40-0KA0 drop into a panel specified around 3RH2140-1BP40?","answer":"Both are SIRIUS Size S00 auxiliary contactors with the same 45 mm width and DIN-rail mounting, so the footprint is identical. The 3RH2344-1DM40-0KA0 has 4 NO contacts and a 24 V DC coil with varistor; the 3RH2140-1BP40 has a different contact configuration and coil voltage. Check your panel's contact count and coil supply before substituting."},{"question":"What compliance documentation does this part carry?","answer":"RoHS compliance is dated 07/01/2006. The part carries IEC 60947-5-1 ratings for control circuit devices. For specific UL, CSA, or other agency certifications, request the manufacturer's declaration with your RFQ."},{"question":"What are the key dimensions of 3RH2344-1DM40-0KA0?","answer":"Width is 45 mm, height is 57.5 mm, depth is 117 mm. Clearance to adjacent components: 10 mm upwards, forwards, and downwards; 6 mm at the side."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2344-1DM40-0KA0","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/3RH2344-1DM40-0KA0 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}}