{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1046-3AL20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1046-3AL20","canonicalUrl":"https://aoctrl.com/siemens/3RT1046-3AL20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1046-3AL20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S3, 3RT1046-3AL20, 55 kW at 500 V AC-3, 230 V 50/60 Hz coil, screw-type terminals, IP20 front, current lifecycle.","salesMarkdown":"The Siemens 3RT1046-3AL20 is a SIRIUS Size S3 power contactor rated for 55 kW at 500 V and 25.4 kW at 690 V in AC-3 duty, meaning it handles the inrush and breaking of standard three-phase induction motors up to that power. The 230 V 50/60 Hz coil draws the contactor in at the rated control voltage; the operating range of 0.8 to 1.1 x Us at 50 Hz and 0.85 to 1.1 x Us at 60 Hz gives the control circuit some headroom before dropout. Fastens by screw or snaps onto 35 mm and 75 mm standard mounting rail, so it fits the usual DIN-rail layout in a control cabinet. Side-by-side mounting is permitted, which lets multiple contactors pack tightly on the rail without a mandatory air gap — useful when building a motor starter group. The IP20 rating on the front with the cover or box terminal installed means the live parts are finger-safe inside the enclosure; the terminal body itself is IP00, so the panel door or additional shrouding protects against accidental contact. ## Switching frequency and mechanical endurance Rated for 850 switching cycles per hour in AC-3 (motor) duty and 900 in AC-1 (resistive). That is about one operation every 4 seconds at the AC-3 rate — fast enough for frequent start-stop applications like conveyors or pumps with short cycle times. Arcing time of 10 to 15 ms and total make/break time of 10 to 25 ms at AC are within the range expected for a contactor this size; the auxiliary contacts (rated 10 A at 24 V down to 0.3 A at 220 V) handle pilot-duty signalling without a separate relay.","metaTitle":"Siemens 3RT1046-3AL20 SIRIUS Power Contactor, 55 kW at 500 V","metaDescription":"Siemens 3RT1046-3AL20 SIRIUS Size S3 power contactor, 55 kW at 500 V AC-3, 230 V 50/60 Hz coil, screw terminals, IP20 front, current lifecycle, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"70 mm","at AC":"10 ... 25 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"900 1/h","at AC-2 maximum":"350 1/h","at AC-3 maximum":"850 1/h","at AC-4 maximum":"250 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","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 50 Hz rated value":"230 V","at 500 V rated value":"55 kW","at 60 Hz rated value":"230 V","at 690 V rated value":"25.4 kW","Side-By-Side Mounting":"Yes","at 1000 V rated value":"37 W","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"45 kW","at AC-4 at 400 V rated value":"80 A","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":"38 kW","at 690 V at 60 °C rated value":"114 kW","at 1000 V at 60 °C rated value":"98 W","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 160 A","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 (24 ... 14)","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 (0.25 ... 1.5 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":"760 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","apparent holding power of magnet coil at AC":"27 VA","apparent pick-up power of magnet coil at AC":"298 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.7","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.29","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=283229&mlfb=3RT1046-3AL20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1046-3AL20/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RT1046-3AL20?","answer":"Submit an RFQ through this listing; the part is sourced to order through independent distribution, and both price and lead time are confirmed at quote time."},{"question":"What is 3RT1046-3AL20's listed depth?","answer":"The depth is 139 mm, with a width of 70 mm and height of 146 mm, fitting the Size S3 footprint."},{"question":"What wire sizes does the 3RT1046-3AL20 accept on the main terminals?","answer":"The screw-type main terminals accept solid conductors 2x (0.25 to 2.5 mm²) and stranded conductors 2x (10 to 50 mm²), covering most motor feeder cables up to the rating."},{"question":"Will 3RT1046-3AL20 drop into a panel specified around 3RT1044-1FB46 without rewiring?","answer":"Both are Size S3 contactors with the same mounting rail and terminal arrangement, so the footprint and wiring points are the same — no rewiring needed for the panel layout. The 3RT1046-3AL20 carries a higher motor power rating (55 kW at 500 V vs the 3RT1044-1FB46), so verify the load current matches the new contactor's AC-3 rating before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1046-3AL20","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/3RT1046-3AL20 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}}