{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1QB44-3MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1QB44-3MA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1QB44-3MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1QB44-3MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1044-1QB44-3MA0, 24 VDC coil, screw-type terminals, size S3, IP20 front, snap-on DIN rail mounting.","salesMarkdown":"The 3RT1044-1QB44-3MA0: It snaps onto 35 mm or 75 mm standard mounting rail — screw and snap-on fastening — so it's a straight drop into any standard DIN-rail panel. The S3 frame size means it's built for motor loads up to around 37 kW at 500 V. IP20 on the front with the cover or box terminal fitted; the terminal area itself is IP00, which is typical for panel-mounted contactors — you're not running this exposed to washdown. Physical footprint: 146 mm high, 70 mm wide, 201 mm deep. Wire terminations: solid conductors accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). Stranded conductors go up to 2x (10 to 50 mm²). That's enough for the main power feeds on a motor circuit in this frame size. That covers most indoor panel environments without derating concerns unless you're near a furnace or on a roof in direct sun. ## Switching capacity and duty cycles For motor starting (AC-3 duty at 400 V), this contactor is rated at 30 kW. That's the number you care about for a standard three-phase induction motor — it tells you the contactor can handle the locked-rotor current and break the load under running conditions. In AC-4 duty (plugging, inching, reversing) at 400 V, it's rated at 55 A. That's a higher stress profile — frequent make-and-break under load — so the rating is lower than the AC-3 equivalent. Maximum switching rates: 1,000 cycles per hour for AC-1 and AC-3, 400 for AC-2, and 300 for AC-4. That's plenty for most process applications; only high-speed indexing or rapid reversing would push the AC-4 limit. Coil inrush at 24 VDC is 10 A initially, holding at 0.8 A after pickup. That's useful for timing coordination in safety circuits or sequential start schemes. RoHS compliant with substance prohibition date of May 1, 2012 — that's the standard EU RoHS cutoff. The part carries the usual Siemens CE marking and is designed to IEC/EN 60947-4-1 standards for contactors. That's the no-load switching endurance; actual electrical life depends on the load current and duty cycle, but it gives you a benchmark for maintenance planning.","metaTitle":"Siemens 3RT1044-1QB44-3MA0 SIRIUS S3 Power Contactor, 24 VDC","metaDescription":"Siemens SIRIUS S3 power contactor, 24 VDC coil, screw terminals, IP20 front, snap-on DIN rail mount. Current production stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"201 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"70 mm","at DC":"14 ... 20 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"24 V","On The Front":"IP20; IP20 on the front with cover / box terminal","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"400 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","Full-Scale Value":"1.1","Size Of Contactor":"S3","Solid Or Stranded":"2x (2.5 ... 16 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"37 kW","at 690 V rated value":"18.6 kW","Side-By-Side Mounting":"Yes","at 1000 V rated value":"30 W","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"30 kW","at AC-4 at 400 V rated value":"55 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"35 mm²","at 60 °C minimum permissible":"35 mm²","Design Of The Surge Suppressor":"with diode assemblies","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"34 kW","at 690 V at 60 °C rated value":"102 kW","at 1000 V at 60 °C rated value":"66 W","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 125 A","closing power of magnet coil at DC":"15 W","holding power of magnet coil at DC":"15 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 250 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Thermal Short-Time Current Limited To 10 S":"600 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","number of NC contacts for auxiliary contacts instantaneous contact":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","Of The Contactor With Added Electronically Optimized 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=331693&mlfb=3RT1044-1QB44-3MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1QB44-3MA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Height 146 mm, width 70 mm, depth 201 mm. Mounts on 35 mm or 75 mm DIN rail via screw and snap-on fastening."},{"question":"What wire sizes does the 3RT1044-1QB44-3MA0 accept?","answer":"Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (10 to 50 mm²). All screw-type terminals."},{"question":"What compliance documentation is available?","answer":"RoHS compliant with substance prohibition date May 1, 2012. Designed to IEC/EN 60947-4-1. Standard Siemens CE marking applies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1QB44-3MA0","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/3RT1044-1QB44-3MA0 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}}