{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1044-1AP04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1044-1AP04","canonicalUrl":"https://aoctrl.com/siemens/3RT1044-1AP04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AP04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1044-1AP04, size S3, 30 kW AC-2 at 400 V, 55 A AC-4, 230 V 50 Hz coil, screw terminals, IP20 front.","salesMarkdown":"It mounts on 35 mm or 75 mm standard DIN rail using screw or snap-on fastening, so it fits into a typical panel layout without special bracketing. For AC-4 duty — plugging and inching of squirrel-cage motors — it carries 55 A at 400 V. The coil is 230 V at 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage, so it holds in during a brownout down to about 184 V. The 3RT1044-1AP04 accepts solid conductors in two ranges: 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), with a maximum of 2x (0.75 to 4 mm²). For stranded conductors, it takes 2x (10 to 50 mm²). The terminal is rated IP00 at the connection point, but the front of the contactor carries IP20 with a cover or box terminal, so it's touch-safe once installed in an enclosure. Side-by-side mounting is allowed with no derating mentioned, which saves rail space in a multi-contactor group. The contactor measures 146 mm high by 70 mm wide by 188 mm deep. That depth is worth checking if you're fitting it into a shallow enclosure — 188 mm is deeper than a typical IEC contactor of this frame size, so leave clearance for the arc chamber and wiring space behind the terminals. ## Duty cycle and mechanical life Maximum switching rates vary by duty: 1,000 operations per hour for AC-1 (resistive) and AC-3 (normal motor start/run), 400 ops/h for AC-2, and 300 ops/h for AC-4. For the auxiliary contact side, the 24 V rated current is 10 A, dropping to 0.3 A at 220 V and 3 A at 400 V — enough for pilot duty on a PLC input or relay coil.","metaTitle":"Siemens 3RT1044-1AP04 SIRIUS Power Contactor, 30 kW AC-2 at","metaDescription":"Siemens 3RT1044-1AP04 SIRIUS power contactor, size S3, 30 kW AC-2 at 400 V, 55 A AC-4, 230 V 50 Hz coil, screw terminals, IP20 front. Sourced to order against RFQ.","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":"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":"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=145186&mlfb=3RT1044-1AP04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1044-1AP04/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for the 3RT1044-1AP04?","answer":"The contactor is rated for 30 kW at 400 V in AC-2 duty and 55 A at 400 V in AC-4 duty. The coil is 230 V at 50 Hz. Mechanical life is 10 million cycles typical, with a maximum switching rate of 1,000 ops/h for AC-3 duty."},{"question":"Where can I buy the 3RT1044-1AP04?","answer":"The 3RT1044-1AP04 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does the 3RT1044-1AP04 have?","answer":"The contactor carries a RoHS compliance date of May 1, 2012, and is rated for pollution degree 3 per IEC standards. It is designed for industrial environments with conductive pollution."},{"question":"Will the 3RT1044-1AP04 drop into a panel specified for 3RT1044-1FB46?","answer":"Both are size S3 SIRIUS contactors with the same mounting footprint on 35 mm or 75 mm DIN rail, so the mechanical fit is the same. The main difference is the coil voltage — the 1AP04 uses 230 V 50 Hz, while the 1FB46 uses a different coil rating. Check the coil voltage against your control circuit before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1044-1AP04","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/3RT1044-1AP04 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}}