{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1046-1AH20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1046-1AH20","canonicalUrl":"https://aoctrl.com/siemens/3RT1046-1AH20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1046-1AH20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1046-1AH20, size S3, screw-type terminals, rated 55 kW at 500 V and 25.4 kW at 690 V, snap-on mounting.","salesMarkdown":"It carries a 55 kW rating at 500 V and 25.4 kW at 690 V, so it handles medium-horsepower pumps, fans, and compressors on 400 V or 690 V distribution. The coil pulls 48 V at 50/60 Hz, with an operating range of 0.8 to 1.1 times rated voltage at 50 Hz and 0.85 to 1.1 at 60 Hz — that gives you a solid pick-up margin even if the control transformer sags under load. ## Mounting and wiring reality Main circuit terminals are screw-type, accepting solid conductors up to 2x (0.75... 4 mm²) per clamp and stranded up to 2x (10... 50 mm²). The front carries IP20 with the cover or box terminal fitted; the terminal body itself is IP00, meaning the live parts are exposed until the enclosure lid is on — standard for panel-mount contactors, but something to flag for the wireman during commissioning. ## Switching duty and mechanical endurance Rated for 10,000,000 mechanical operations typical — that is the contactor body itself, not the contacts under load. Electrical life depends on the duty class: AC-1 (resistive) allows up to 900 switching cycles per hour, AC-3 (squirrel-cage motor start/run) allows 850 per hour, AC-2 (slip-ring motor) drops to 350, and AC-4 (plugging/inching) is limited to 250 per hour. For a conveyor line running a motor start every 30 seconds, the AC-3 rate of 850 cycles/hour gives you headroom; for a reversing application with frequent plugging, the AC-4 limit is the one to watch. ## Environmental and auxiliary ratings Operates from -25 to +60 °C, stores from -55 to +80 °C — fine for unheated panel sheds in northern climates as long as the cabinet stays above -25. Auxiliary contact ratings: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V — these are the figures to use when sizing the control circuit fusing, not the main contactor rating.","metaTitle":"Siemens 3RT1046-1AH20 SIRIUS Power Contactor, 55 kW at 500 V","metaDescription":"Siemens SIRIUS 3RT1046-1AH20 power contactor, size S3, rated 55 kW at 500 V, 25.4 kW at 690 V. Screw terminals, snap-on 35/75 mm rail. Active production. Source via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 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":"48 V","at 500 V rated value":"55 kW","at 60 Hz rated value":"48 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)":"01.05.2012","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":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 160 A","reference code acc. to IEC 81346-2":"Q","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)","Thermal Short-Time Current Limited To 10 S":"760 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","apparent holding power of magnet coil at AC":"27 V·A","apparent pick-up power of magnet coil at AC":"298 V·A","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=173843&mlfb=3RT1046-1AH20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1046-1AH20/alternatives.json"},"ai":{"faq":[{"question":"What are the main power ratings for this contactor?","answer":"Rated motor power is 55 kW at 500 V and 25.4 kW at 690 V. The coil is 48 V at 50/60 Hz with an operating range of 0.8 to 1.1 (50 Hz) and 0.85 to 1.1 (60 Hz)."},{"question":"What wire sizes does the screw terminal accept?","answer":"Solid conductors: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²). Stranded: 2x (10... 50 mm²)."},{"question":"What is the physical size of the 3RT1046-1AH20?","answer":"Height 146 mm, width 70 mm, depth 139 mm. It is a size S3 contactor and mounts via screw and snap-on onto 35 mm or 75 mm rail."},{"question":"Can it be mounted side-by-side with other contactors?","answer":"Yes, side-by-side mounting is permitted. No spacing gap is required, but thermal derating should be considered when grouping multiple contactors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1046-1AH20","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/3RT1046-1AH20 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}}