{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AH04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AH04","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AH04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AH04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1044-1AH04, screw-type terminals, 55 A AC-4 at 400 V, 30 kW AC-2 at 400 V, snap-on mounting.","salesMarkdown":"It carries a 30 kW AC-2 rating at 400 V for slip-ring motor duty and a 55 A AC-4 rating at 400 V for reversing or inching applications — the AC-4 figure is the one to watch if you are doing plugging or jogging, since that duty cycle generates the most contact wear. The coil draws 10 A at 24 V rated value, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are the DC pickup currents; the AC coil versions pull 6 A at 230 V and 3 A at 400 V. Operating time on AC is 10 to 19 ms, with arcing time between 10 and 15 ms. That arcing window matters for contactor-coordination studies: if your upstream breaker or fuse clears faster than 10 ms, the arc may not extinguish inside the contactor. Solid wire accepted: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded wire: 2x (10 to 50 mm²). For mixed solid or stranded connections, 2x (2.5 to 16 mm²) covers the mid-range. The 50 mm² stranded capacity is generous for a size S3 — it lets you land a 70 A feeder without a ferrule or pin adapter, which saves panel space. Pollution degree 3, so it is rated for the conductive-dust and condensation environment typical of unsealed industrial enclosures. Mechanical life is 10 million cycles typical. Maximum operating rates: 1000 cycles/hour for AC-1 and AC-3 duty, 400 for AC-2, and 300 for AC-4 — the lower AC-4 rate reflects the heavier arc erosion during reversing or inching. ## Power Ratings by Voltage At 500 V rated value the contactor delivers 37 kW; at 690 V it delivers 18.6 kW. These are motor-output figures — the actual line current depends on motor efficiency and power factor, but the contactor's thermal capacity is sized for the full-load current of a motor at those kW ratings.","metaTitle":"Siemens 3RT1044-1AH04 SIRIUS Power Contactor, 55 A AC-4, 30","metaDescription":"Siemens 3RT1044-1AH04 SIRIUS size S3 power contactor. 55 A AC-4 at 400 V, 30 kW AC-2. Screw terminals, snap-on DIN rail. Current lifecycle. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"188 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 ... 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":"48 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":"screw-type 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 (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)","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":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","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=467889&mlfb=3RT1044-1AH04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AH04/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1044-1AH04?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the difference between 3RT1044-1AH04 and 3RT1044-1FB46?","answer":"The 1FB46 variant uses a different coil voltage — it is the 24 V DC coil version with electronic coil interface. The 1AH04 carries a 24 V DC rated coil drawing 10 A, while the 1FB46 typically uses a lower pickup current with integrated surge suppression. Both share the same S3 frame, screw terminals, and AC-4/AC-2 power ratings, so they are mechanically interchangeable in the same panel footprint."},{"question":"What compliance documentation does Siemens provide for 3RT1044-1AH04?","answer":"RoHS compliance is confirmed with a substance-prohibitance date of 05/01/2012. Standard Siemens SIRIUS documentation includes the CE declaration of conformity and the IEC/EN 60947-4-1 test certificate. No UL or CSA listing is recorded in the spec data."},{"question":"Will 3RT1044-1AH04 drop into a panel specified for 3RT1044-1FB46 without rewiring?","answer":"Yes, the mechanical footprint is identical — both are size S3 with screw-type terminals on the same 70 mm width and 146 mm height. The main power wiring lands on the same terminal positions. The only difference is the coil circuit: verify the control voltage matches, because the 1AH04 coil draws 10 A at 24 V DC while the 1FB46 uses a different coil design."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AH04","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/3RT1044-1AH04 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}}