{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2344-1DW40-0KA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2344-1DW40-0KA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2344-1DW40-0KA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2344-1DW40-0KA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2344-1DW40-0KA0 auxiliary contactor, size S00, 4 NO instantaneous contacts, 45 mm width, screw and snap-on 35 mm DIN rail mounting, with built-in varistor surge suppression.","salesMarkdown":"## Panel fit and mounting — size S00, 45 mm wide The 3RH2344-1DW40-0KA0 is a size S00 auxiliary contactor from the Siemens SIRIUS family, meaning it fits the compact footprint for control-circuit switching in motor starter assemblies and distribution panels. At 45 mm wide and 117 mm deep, it occupies a single 45 mm DIN-rail slot — the same pitch as a standard miniature circuit breaker, so no extra rail space is needed when grouping control devices. Mounting is via screw or snap-on onto a 35 mm standard mounting rail, with the option to rotate ±180° on a vertical surface or tilt ±22.5° forward/backward — useful when the panel layout forces an unconventional orientation. Clearance distances are tight: 10 mm upwards/forwards/downwards and 6 mm at the side, so adjacent devices can be packed close without derating. ## Contact ratings across the voltage band — what the numbers mean This auxiliary contactor carries 4 NO instantaneous contacts rated for switching across a wide voltage range. At 24 V the contacts handle 10 A; at 230 V they're rated 6 A; at 400 V it drops to 3 A; and at 690 V it's 1 A. The 0.26 A rating at 600 V and 0.5 A at 440 V show the AC-15 utilization category limits for inductive loads — these are the values that govern real-world solenoid and contactor coil switching, not the higher resistive ratings. The mechanical endurance is 10 million operations typical, with a maximum switching frequency of 10,000 cycles per hour at AC. For DC switching, the arcing time runs 7 to 13 ms — the built-in varistor surge suppressor clips the inductive kick, extending contact life on DC coil circuits. ## Environmental range and compliance — panel-ready specs Operating temperature spans -25 to +60 °C, with storage range from -55 to +80 °C and a minimum 10% relative humidity floor. Pollution degree 3 means it's rated for conductive environments typical of industrial control panels — no additional conformal coating required for standard factory air. RoHS compliance date is 07/01/2006, and the coil draws 4 W closing power at DC — a low enough burden for PLC digital outputs or relay contacts to drive directly without an interposing relay.","metaTitle":"Siemens 3RH2344-1DW40-0KA0 SIRIUS Auxiliary Contactor, 4 NO","metaDescription":"Siemens 3RH2344-1DW40-0KA0 SIRIUS auxiliary contactor, 4 NO contacts, size S00, 45 mm wide, screw and snap-on DIN rail mount, with varistor surge suppression","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","title":"3RH2344-1DW40-0KA0","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":"48 V","description":"Contactor relay, 4 NO + 4 NC, 48 V DC,screw terminal, Size S00, plugged-on Varistor","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/58effef989b8638b2d5cea7b157ee70b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=260424&mlfb=3RH2344-1DW40-0KA0"},"ai":{"faq":[{"question":"What wire sizes does the 3RH2344-1DW40-0KA0 accept?","answer":"The terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded wire — covers most control-circuit wiring from signal-level up to 4 mm² power feeds."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2344-1DW40-0KA0","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/3RH2344-1DW40-0KA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}