{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5044-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5044-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT5044-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5044-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT5044-1BW40, 59 kW at 400 V 60 °C, screw-type terminals, snap-on DIN-rail mount.","salesMarkdown":"It mounts on standard 35 mm or 75 mm DIN rails via screw or snap-on fastening, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward — useful when panel layout is tight. Rated insulation voltage is 1 000 V, and at 400 V 60 °C it handles 59 kW motor load — a solid figure for a contactor this size. At 690 V 60 °C it's rated for 102 kW, which gives headroom if your line runs higher voltage. The coil draws 15 W both closing and holding at DC, so the control transformer or DC supply needs to sustain that continuously, not just a surge. Auxiliary switch extension is supported, meaning you can add feedback contacts for PLC status monitoring without a separate relay. Maximum mechanical life is 10 000 000 operations typical, and the switching frequency at AC-3 is 1 000 cycles per hour — that's about one operation every 3.6 seconds, which is fine for conveyor or pump cycling but not for high-speed pick-and-place. RoHS compliance is dated 03/01/2017, and the substance prohibitance date aligns with EU RoHS requirements. For cross-border shipments, expect standard Siemens compliance documentation (CE, UL, CSA) available with the shipment. Dimensions are 70 mm wide, 146 mm high, 152 mm deep — the S3 footprint is compact for its power class. Main circuit terminals accept 2x (2.5 to 16 mm²) solid or stranded wire, or 2x (10 to 1/0 AWG). The fuse recommendation for type 2 coordination is gL/gG 125 A.","metaTitle":"Siemens 3RT5044-1BW40 SIRIUS Power Contactor, S3, 59 kW at 4","metaDescription":"Siemens SIRIUS 3RT5044-1BW40 power contactor, size S3, rated 59 kW at 400 V 60 °C. Active lifecycle, screw terminals, DIN-rail mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Width":"70 mm","at DC":"1 000 1/h","Height":"146 mm","Rated Value":"48 V","During Storage":"-55 ... +80 °C","at AC-1 maximum":"1 000 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","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":"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":"6 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 690 V rated value":"18.6 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"03/01/2017","at 40 °C minimum permissible":"35 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"34 kW","at 400 V at 60 °C rated value":"59 kW","at 690 V at 60 °C rated value":"102 kW","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","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","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)","at ambient temperature 40 °C rated value":"100 A","at ambient temperature 60 °C rated value":"90 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","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":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0"}},"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=580025&mlfb=3RT5044-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT5044-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Width is 70 mm, height 146 mm, depth 152 mm. It mounts on 35 mm or 75 mm DIN rail with screw or snap-on fastening, and side-by-side mounting is permitted."},{"question":"What compliance documentation comes with this contactor?","answer":"RoHS compliance is confirmed with a substance prohibitance date of 03/01/2017. Standard Siemens documentation includes CE, UL, and CSA certifications available with shipment."},{"question":"What wire sizes does the main circuit accept?","answer":"Main terminals accept 2x (2.5 to 16 mm²) solid or stranded, or 2x (10 to 1/0 AWG). Screw-type terminals are used for both main and control circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5044-1BW40","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/3RT5044-1BW40 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}}