{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1024-1AC20 power contactor, size S0, 24 V 50/60 Hz coil, 45 mm width, screw terminals, AC-2 rated 5.5 kW at 400 V.","salesMarkdown":"The 3RT1024-1AC20: Coil is 24 V, rated for both 50 Hz and 60 Hz, with an operating range of 0.8 to 1.1 times the rated voltage. That's a standard tolerance — your 24 V control transformer needs to stay above 19.2 V under load to guarantee pick-up. For AC-4 at 400 V, the rated operational current is 12.5 A, which covers plugging and inching duty cycles on squirrel-cage motors. If your application is standard AC-3 direct-on-line starting, the 7.5 kW ratings at 500 V and 690 V give you the headroom for higher-voltage motor circuits. This contactor is specified with two coordination levels. That's a meaningful difference in selectivity — if you're coordinating with a motor protection breaker rather than fuses, confirm the let-through energy of your MCCB or manual motor starter stays within the contactor's withstand. Pollution degree 3 rating means it's suited for the typical industrial control panel environment where conductive pollution can occur. ## Wiring and endurance Both main and auxiliary circuits use screw-type terminals. Main contacts accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid or stranded — that covers standard motor cable up to 4 mm². AWG equivalents: main 2x (16 to 12), 2x (14 to 10), 1x 8; auxiliary 2x (20 to 16), 2x (18 to 14), 1x 12. Mechanical endurance is 10 million cycles typical — that's the life of the contactor mechanism without contact wear. Electrical endurance depends on the switching category and load current; for AC-3 duty at rated current, expect roughly 1 to 2 million operations before contact inspection is needed. RoHS compliance date is 01 July 2006 — the part meets the original EU RoHS directive. It carries the IEC 81346-2 reference code Q, which designates it as a switching device in the plant documentation system.","metaTitle":"Siemens 3RT1024-1AC20 SIRIUS Power Contactor, 24V Coil, 45mm","metaDescription":"Siemens 3RT1024-1AC20 SIRIUS power contactor, size S0, 24V 50/60Hz coil, 45mm width, AC-2 5.5kW at 400V. Current production. Screw terminals. DIN rail mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"91 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"45 mm","Height":"85 mm","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 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":"24 V","at 500 V rated value":"7.5 kW","at 60 Hz rated value":"24 V","at 690 V rated value":"7.5 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"5.5 kW","at AC-4 at 400 V rated value":"12.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","reference code acc. to IEC 81346-2":"Q","With Type Of Coordination 1 Required":"fuse gL/gG: 63 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","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)","apparent holding power of magnet coil at AC":"8.4 V·A","apparent pick-up power of magnet coil at AC":"64 V·A","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","Inductive Power Factor With Closing Power Of The Coil":"0.72","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.24","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=93797&mlfb=3RT1024-1AC20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1AC20/alternatives.json"},"ai":{"faq":[{"question":"What are the mounting dimensions?","answer":"Width 45 mm, height 85 mm, depth 91 mm. It snaps onto 35 mm DIN rail per DIN EN 50022. Side-by-side mounting is permitted."},{"question":"What wire sizes does the screw terminal accept?","answer":"Main contacts: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid/stranded. Auxiliary contacts: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm². AWG equivalents are listed in the spec table."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1AC20","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/3RT1024-1AC20 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}}