{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1446-1BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1446-1BG40","canonicalUrl":"https://aoctrl.com/siemens/3RT1446-1BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1446-1BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, 3RT1446-1BG40, Size S3, 38.2 kW at 690 V, screw-type terminals, snap-on 35/75 mm rail.","salesMarkdown":"Its key motor ratings are 22 kW at AC-2 duty on 400 V and 38.2 kW at 690 V — the 690 V figure is the one that matters for 690 V line-fed drives or transformers, while the AC-2 rating governs slip-ring motor switching where starting current is higher than a standard squirrel-cage. It accepts stranded conductors up to 2x 50 mm², and at 40 °C ambient the minimum permissible cable is 50 mm² — meaning you don't need to oversize the lug for thermal headroom. Side-by-side mounting is permitted, which keeps the row width tight when ganging multiple contactors for a multi-motor group. The S3 frame is a mid-range contactor body — 146 mm high, 70 mm wide, 152 mm deep — sized for motors in the 30–50 kW range depending on voltage and duty. The 690 V rating at 60 °C ambient (148 kW) shows this contactor can handle high-voltage, high-power loads, but the 60 °C derating curve means the terminal capacity drops to 35 mm² minimum at that temperature — so if your panel runs hot, you still land 35 mm² cable without splicing. The front face carries IP20 with the cover or box terminal fitted; the terminal itself is IP00, meaning the wiring compartment needs enclosure protection in washdown areas. Mechanical life is 10,000,000 operations typical, and the maximum switching rate at AC-1 resistive load is 650 cycles per hour. That's a fast mover for a contactor this size — it can keep pace with a cycling load like a compressor or a rapid-index conveyor without wearing out the armature prematurely. The substance prohibitance date is 05/01/2012, which aligns with RoHS compliance for the European market.","metaTitle":"Siemens 3RT1446-1BG40 SIRIUS Power Contactor, S3, 38.2 kW at","metaDescription":"Siemens SIRIUS 3RT1446-1BG40 power contactor, Size S3. Rated 38.2 kW at 690 V, 22 kW at AC-2 400 V. Screw terminals, snap-on DIN rail. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 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":"125 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":"650 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":"29.9 kW","at 690 V rated value":"38.2 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"22 kW","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"50 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"50 kW","at 690 V at 60 °C rated value":"148 kW","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 gR: 250 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":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","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=307860&mlfb=3RT1446-1BG40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1446-1BG40/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor power ratings for this contactor?","answer":"At AC-2 duty on 400 V it is rated for 22 kW. At 690 V the rating is 38.2 kW. At 230 V and 60 °C ambient it can handle 50 kW, and at 690 V and 60 °C it reaches 148 kW."},{"question":"What wire sizes does the screw terminal accept?","answer":"The main terminals accept stranded conductors up to 2x 50 mm². For solid wire, it accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²). The minimum permissible cable at 40 °C is 50 mm², and at 60 °C it drops to 35 mm²."},{"question":"Does it mount on standard DIN rail?","answer":"Yes, it mounts via screw and snap-on onto 35 mm and 75 mm standard mounting rail. Side-by-side mounting is also permitted."},{"question":"What is the mechanical life expectancy?","answer":"Typical mechanical life is 10,000,000 operations. The maximum switching rate at AC-1 resistive load is 650 cycles per hour."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1446-1BG40","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/3RT1446-1BG40 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}}