{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3AP00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3AP00","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3AP00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AP00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1044-3AP00, 37 kW at 500 V AC-3, 55 A at AC-4 400 V, screw-type terminals, snap-on mounting.","salesMarkdown":"Rated 37 kW at 500 V in AC-3 duty, this contactor handles the heavy lifting on conveyors, pumps, and compressors up to that motor power. The AC-4 rating of 55 A at 400 V covers the inching and plugging cycles that wear out smaller contactors fast. Screw-type terminals on the main circuit accept solid wire 2x (0.25–2.5 mm²) and stranded 2x (10–50 mm²), giving the panel wireman a clear termination range for both control and power feeds. ## Lifecycle and compliance — still active, no surprises Substance prohibited as of 05/01/2012, which aligns with the RoHS compliance date. The AC-1 maximum switching rate of 1000 1/h tells you this contactor can cycle resistive loads (heaters, lighting) at that pace without overheating the coil or arc chamber. For AC-3 motor switching, the same 1000 1/h rate applies — typical for start-run cycles on a conveyor. AC-4 drops to 300 1/h, reflecting the heavier arc wear from reversing or jogging. Arcing time is 10–19 ms at AC and 10–15 ms for the main contacts — that is the interval the arc extinguishes after the coil drops. It matters for coordination with upstream fuses or breakers: a slower arc can let fault current ride through, but this range is standard for a contactor of this frame. The IP20 front (IP00 at the terminal) means the contactor body is finger-safe once mounted in an enclosure; the terminals themselves need the panel door or a terminal cover for protection. Mechanical life of 10,000,000 operations typical for this class. Dimensions: 70 mm wide, 146 mm high, 139 mm deep. The auxiliary contact block (not included) plugs onto the front; the coil terminals are screw-type and accept the same wire ranges as the main circuit. For the control wiring, the 2x (0.25–2.5 mm²) solid range covers typical 1.5 mm² control cable.","metaTitle":"Siemens 3RT1044-3AP00 SIRIUS Power Contactor, S3, 37 kW at 5","metaDescription":"Siemens 3RT1044-3AP00 SIRIUS power contactor, size S3, rated 37 kW at 500 V AC-3, 55 A at AC-4 400 V. Screw terminals, snap-on 35/75 mm rail. RoHS 2012. Sourced 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 ... 19 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 50 Hz":"0.8 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"400 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","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":"37 kW","at 690 V rated value":"18.6 kW","Side-By-Side Mounting":"Yes","at 1000 V rated value":"30 W","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"30 kW","at AC-4 at 400 V rated value":"55 A","Substance Prohibitance (Date)":"05/01/2012","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 690 V at 60 °C rated value":"102 kW","at 1000 V at 60 °C rated value":"66 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: 125 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":"600 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","apparent holding power of magnet coil at AC":"21 VA","apparent pick-up power of magnet coil at AC":"218 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":"0.61","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.26","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=7617&mlfb=3RT1044-3AP00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AP00/alternatives.json"},"ai":{"faq":[{"question":"Will 3RT1044-3AP00 drop into a panel that was specified around 3RT1044-1FB46 without rewiring?","answer":"Both are SIRIUS size S3 contactors with the same mounting footprint (70 mm wide, snap-on 35/75 mm rail) and screw-type terminals. The terminal wire ranges are identical, so it is a mechanical and wiring drop-in. The electrical ratings differ — verify the coil voltage and load current match your application."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3AP00","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/3RT1044-3AP00 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}}