{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2544-1AL20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2544-1AL20","canonicalUrl":"https://aoctrl.com/siemens/3RT2544-1AL20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2544-1AL20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, contactor, size S3, 3RT2544-1AL20, screw-type terminals, auxiliary switch, 152 mm depth, 70 mm width, 140 mm height.","salesMarkdown":"## SIRIUS S3 contactor — panel fit and switching capability It fastens via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward/backward — useful when fitting into a crowded enclosure where the rail orientation is fixed. The contactor envelope measures 152 mm deep by 70 mm wide by 140 mm high. Clearance requirements: 10 mm upwards, 0 mm forwards, 0 mm backwards, 10 mm downwards, and 10 mm at the side. That zero forward/backward gap means it can sit flush against a panel backplane or a neighbouring device, which simplifies layout in a tight row. Power-circuit wiring accepts stranded conductors: 2x (6…16 mm²), 2x (10…50 mm²), or 1x (10…70 mm²). Control-circuit terminals take solid or stranded 2x (0.5…1.5 mm²) or 2x (0.75…2.5 mm²). The 70 mm² single-conductor capacity on the power side is generous for an S3 frame — it can terminate a motor feeder without needing a separate terminal block for the line-side cable. ## Auxiliary contact ratings across the voltage range The built-in auxiliary switch is rated at 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V, 1.8 A at 440 V, 2 A at 500 V, and 0.1 A at 600 V. These are the make/break capacities for the auxiliary contacts — they define what PLC input, relay coil, or indicator lamp this contactor can switch directly without an interposing relay. The 6 A at 230 V is notably higher than the 0.3 A at 220 V, so confirm the nominal voltage of the control circuit against the table before committing the BOM line. Switching times: AC operate time 11…21 ms, arcing time 10…20 ms. The arcing window matters for coordination with upstream short-circuit protection — a fuse or MCCB must hold through the 20 ms arc without nuisance tripping on a normal switching event. ## Lifecycle and compliance posture Operating temperature range is -25…+60 °C, storage range -55…+80 °C.","metaTitle":"Siemens SIRIUS 3RT2544-1AL20 Contactor, S3 Size, 152 mm Dept","metaDescription":"Siemens SIRIUS 3RT2544-1AL20 contactor, size S3, screw-type terminals, 152 mm depth, 70 mm width. Current lifecycle stage. Auxiliary switch included. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"70 mm","at AC":"11 ... 21 ms","Height":"140 mm","Upwards":"10 mm","Forwards":"0 mm","Stranded":"2x (6 ... 16 mm²), 2x (10 ... 50 mm²), 1x (10 ... 70 mm²)","at 50 Hz":"0.35","at 60 Hz":"0.41","Backwards":"0 mm","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"10 mm","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"900 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 440 V rated value":"1.8 A","at 50 Hz rated value":"230 V","at 500 V rated value":"2 A","at 60 Hz rated value":"230 V","at 600 V rated value":"0.1 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Relative Humidity Minimum":"10 %","per NC contact rated value":"65 A","per NO contact rated value":"65 A","Of Main Circuit Rated Value":"8 kV","Substance Prohibitance (Date)":"09/01/2017","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gR: 250 A (690 V, 100 kA)","at 24 V per NC contact rated value":"100 A","at 24 V per NO contact rated value":"100 A","At Contactor For Auxiliary Contacts":"Screw-type terminals","at 110 V per NC contact rated value":"100 A","at 110 V per NO contact rated value":"100 A","at 220 V per NC contact rated value":"7 A","at 220 V per NO contact rated value":"7 A","at 230 V per NC contact rated value":"18.5 kW","at 230 V per NO contact rated value":"18.5 kW","at 400 V per NC contact rated value":"30 kW","at 400 V per NO contact rated value":"30 kW","at 440 V per NC contact rated value":"0.42 A","at 440 V per NO contact rated value":"0.42 A","With Type Of Coordination 1 Required":"gG: 250 A (690 V, 100 kA)","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","number of NC contacts for main contacts":"2","number of NO contacts for main contacts":"2","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":"4","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","at ambient temperature 40 °C rated value":"100 A","at ambient temperature 60 °C rated value":"90 A","mirror contact according to IEC 60947-4-1":"Yes","apparent holding power of magnet coil at AC":"25 VA","apparent pick-up power of magnet coil at AC":"348 VA","Type Of Voltage Of The Control Supply Voltage":"AC","for 3-phase AC motor at 460/480 V rated value":"25 hp","Limited To 1 S Switching At Zero Current Maximum":"880 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"880 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"691 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"437 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"344 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Inductive Power Factor With Closing Power Of The Coil":"0.62","Of Main Circuit With Degree Of Pollution 3 Rated Value":"1 000 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.35","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 10 A","minimum cross-section in main circuit at maximum AC-1 rated value":"35 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","AWG number as coded connectable conductor cross section for main contacts":"10 ... 2","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","power loss [W] at AC-3 at 400 V for rated value of the operational current per conductor":"3.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fb918960dd2a48789b6a44ffa1363bda.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630086&mlfb=3RT2544-1AL20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2544-1AL20/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does 3RT2544-1AL20 accept?","answer":"Power circuit: stranded 2x (6…16 mm²), 2x (10…50 mm²), or 1x (10…70 mm²). Control circuit: solid or stranded 2x (0.5…1.5 mm²) or 2x (0.75…2.5 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2544-1AL20","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/3RT2544-1AL20 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}}