{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-3AL20-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-3AL20-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-3AL20-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AL20-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1044-3AL20-ZX95, rated 37 kW at 500 V AC-3, screw-type terminals, snap-on mounting for 35 mm and 75 mm rail.","salesMarkdown":"The Siemens SIRIUS 3RT1044-3AL20-ZX95 is a size S3 power contactor rated for motor switching up to 37 kW at 500 V under AC-3 duty, meaning it handles the inrush and break current of a standard three-phase induction motor at that load point. The main power circuit uses screw-type terminals, with a solid-wire capacity of 2x (0.25 to 2.5 mm²) and a stranded-wire capacity of 2x (10 to 50 mm²), covering the range from control-circuit pilot wiring to motor feeder cables. The AC-3 motor rating of 37 kW at 500 V is the headline figure for sizing this contactor to a motor load; at 690 V the same contactor is rated 18.6 kW, reflecting the higher voltage stress on the switching gap. Mechanical life is rated at 10 million operations typical, with maximum switching frequencies of 1000 cycles per hour under AC-3 and AC-1, and 400 cycles per hour under AC-2 — the AC-2 limit governs applications with frequent jogging or inching. Operating temperature range of -25 to +60 °C and storage range of -55 to +80 °C cover most indoor industrial environments; the IP20 rating on the front (with cover or box terminal) and IP00 at the terminal itself means the panel enclosure provides the touch protection. Side-by-side mounting is permitted, which saves DIN-rail space when grouping multiple contactors in a motor control centre. Dimensions of 146 mm height, 70 mm width, and 139 mm depth fit the S3 footprint; verify gland-plate clearance for the 139 mm depth when the contactor is mounted near the back wall of a shallow enclosure.","metaTitle":"Siemens 3RT1044-3AL20-ZX95 SIRIUS Power Contactor, Size S3,","metaDescription":"Siemens SIRIUS 3RT1044-3AL20-ZX95 power contactor, size S3, rated 37 kW at 500 V AC-3. Screw terminals, snap-on 35/75 mm rail. Current lifecycle stage. Sourced to order against RFQ","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","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":"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 60 Hz rated value":"230 V","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":"25 VA","apparent pick-up power of magnet coil at AC":"247 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":"0.62","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.27","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=340503&mlfb=3RT1044-3AL20-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-3AL20-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT1044-3AL20-ZX95's listed depth?","answer":"The listed depth is 139 mm, which is the dimension from the mounting rail to the furthest front projection."},{"question":"What compliance documentation does this brand provide for 3RT1044-3AL20-ZX95?","answer":"As a Siemens SIRIUS product, it carries the standard CE marking for the European market and is designed to meet applicable IEC/EN standards for contactors; specific RoHS and REACH declarations are available from the manufacturer's documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-3AL20-ZX95","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/3RT1044-3AL20-ZX95 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}}