{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1446-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1446-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT1446-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1446-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S3 frame, 3RT1446-1BW40, 29.9 kW at 500 V AC-3, 38.2 kW at 690 V AC-3, screw terminals, 70 x 146 x 152 mm.","salesMarkdown":"The Siemens 3RT1446-1BW40 is a SIRIUS power contactor in the S3 frame size, rated for motor loads up to 29.9 kW at 500 V and 38.2 kW at 690 V in AC-3 duty. That 690 V rating covers 575 V and 600 V line supplies common in North American and Canadian panels without derating the motor power. Main circuit terminals are screw-type, accepting solid conductors 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), max. 2x (0.75...4 mm²) on the control side, and stranded conductors 2x (10...50 mm²) on the power side. That's a 50 mm² maximum — enough for 1/0 AWG or 2 AWG depending on stranding — with a 35 mm² minimum at 60 °C ambient. IP20 on the front with the cover or box terminal installed; the terminal itself is IP00, so panel builders should plan for finger-safe shrouding or enclosure clearance if the contactor is mounted near an access door. ## Coil and switching performance Coil holds at 24 V DC nominal with a 10 A inrush at that voltage; at 60 V DC it draws 2 A, at 110 V DC 1 A, at 220 V DC 0.3 A. The arcing time is 10 to 20 ms, and the mechanical life is 10 million operations typical — that's a solid 10-year run at 2,700 ops/day. Maximum switching rate at AC-1 (resistive load) is 650 operations per hour.","metaTitle":"Siemens 3RT1446-1BW40 SIRIUS Power Contactor, S3, 29.9 kW at","metaDescription":"Siemens 3RT1446-1BW40 SIRIUS power contactor, S3 frame, 29.9 kW at 500 V / 38.2 kW at 690 V. Screw terminals, DIN rail mount, IP20 front. Current lifecycle. 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":"48 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=48712&mlfb=3RT1446-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1446-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1446-1BW40?","answer":"The 3RT1044-1FB46 is a smaller S2 frame contactor and does not match the S3 frame dimensions or the 50 mm² terminal capacity of the 3RT1446-1BW40. The 3RT5046-1BM40 is a SIRIUS 3RT5 series with the same S3 frame but uses spring-cage terminals instead of screw terminals. Neither is a direct drop-in without rewiring or panel modification."},{"question":"Will 3RT1446-1BW40 drop into a panel specified around 3RT1044-1FB46?","answer":"No — the 3RT1044-1FB46 is an S2 frame (55 mm wide) while the 3RT1446-1BW40 is an S3 frame (70 mm wide). The 15 mm width difference and different terminal layout mean the panel mounting holes and wiring ducts would need rework."},{"question":"Where can I buy 3RT1446-1BW40 and get current pricing?","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 binding commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1446-1BW40","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/3RT1446-1BW40 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}}