{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2545-1AL20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2545-1AL20","canonicalUrl":"https://aoctrl.com/siemens/3RT2545-1AL20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2545-1AL20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2545-1AL20 contactor, size S3, 230 V AC 50/60 Hz coil, screw-type terminals, 10 A auxiliary contacts, 10 000 000 mechanical cycles, DIN rail mount.","salesMarkdown":"## Frame size S3, 230 V coil, active production The 3RT2545-1AL20: The coil draws 0.35 VA holding power at 50 Hz and 0.41 VA at 60 Hz — a low continuous drain that keeps the control transformer lightly loaded when the contactor is sealed in. ## Mounting and clearances for panel integration At 152 mm deep, 70 mm wide, and 140 mm tall, it fits a standard S3 footprint without surprises. ## Terminal capacity and auxiliary contact ratings Main power terminals accept stranded wire from 6 mm² up to 70 mm² (single conductor), or dual conductors from 6–16 mm² and 10–50 mm². Auxiliary terminals handle solid or stranded 0.5–2.5 mm². All are screw-type — no special crimp tooling needed for field replacement. The 10 A at 24 V rating holds the unit on the grid for PLC-level pilot duty without an interposing relay. ## Thermal and mechanical endurance The arcing time at AC is 10–20 ms, and the maximum switching rate in AC-1 duty is 900 operations per hour — sufficient for most motor starting and resistive load switching.","metaTitle":"Siemens 3RT2545-1AL20 SIRIUS Contactor, Size S3, 230V Coil","metaDescription":"Siemens 3RT2545-1AL20 SIRIUS contactor, size S3, 230V 50/60Hz coil, screw-type terminals, 10M mechanical cycles. Active production, quoted to order.","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":"80 A","per NO contact rated value":"80 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":"22 kW","at 230 V per NO contact rated value":"22 kW","at 400 V per NC contact rated value":"37 kW","at 400 V per NO contact rated value":"37 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":"125 A","at ambient temperature 60 °C rated value":"105 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":"30 hp","Limited To 1 S Switching At Zero Current Maximum":"1 080 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"1 080 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"851 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"538 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"423 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":"50 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":"5.3 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=630094&mlfb=3RT2545-1AL20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2545-1AL20/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2545-1AL20","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/3RT2545-1AL20 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}}