{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1023-1AC20, size S0, 24 VAC 50/60 Hz coil, screw terminals, 4 kW AC-2 at 400 V, 8.5 A AC-4.","salesMarkdown":"Rated 4 kW in AC-2 duty at 400 V, this contactor handles slip-ring motor starting and reversing. For AC-4 plugging and inching, it carries 8.5 A — the rating that governs real-world reversing or jogging cycles. Front face is IP20; terminals are IP00 — panel builders should maintain at least 10 mm clearance to grounded metal around the screw terminals. ## Coordination and wiring Type 1 coordination requires a 63 A gL/gG fuse upstream; Type 2 coordination needs 25 A. The main circuit screw terminals accept 2x (1–2.5 mm²) solid or stranded, up to 2x 10 mm² max — enough for the 4 kW motor circuit without a separate terminal block. Auxiliary and control circuit terminals use screw-type connections accepting 2x (0.5–1.5 mm²) solid, up to 2x 4 mm² max. The 24 VAC coil draws about 10 A inrush at rated voltage, settling to holding current — factor this into control transformer sizing. ## Switching capacity and environment Rated operational current for AC loads: 6 A at 230 V, 3 A at 400 V, 0.3 A at 220 V DC.","metaTitle":"Siemens 3RT1023-1AC20 SIRIUS Power Contactor, 24 VAC/50-60 H","metaDescription":"Siemens 3RT1023-1AC20 SIRIUS power contactor, size S0, 24 VAC coil 50/60 Hz, 4 kW AC-2 at 400 V, 8.5 A AC-4. Screw terminals, DIN rail mount. Active production, sourced to order.","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":"4.5 kW","at 60 Hz rated value":"24 V","at 690 V rated value":"5.5 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"4 kW","at AC-4 at 400 V rated value":"8.5 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=423730&mlfb=3RT1023-1AC20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1AC20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RT1023-1AC20 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the closest functional second-source to the 3RT1023-1AC20?","answer":"The 3RT1023-1AL20 is the same SIRIUS size S0 contactor but with a 24 VDC coil instead of 24 VAC. It drops into the same DIN rail footprint and terminal layout — no rewiring needed if the control voltage is DC. For AC coil applications, the 1AC20 is the correct variant."},{"question":"What is the 3RT1023-1AC20's depth?","answer":"The depth is 91 mm, with a width of 45 mm and height of 85 mm — fits standard S0 contactor spacing on 35 mm DIN rail."},{"question":"Will the 3RT1023-1AC20 drop into a panel specified around the 3RT1023-1AL20 without rewiring?","answer":"Yes, mechanically identical — same S0 frame, same 45 mm width, same screw terminal layout, same DIN rail clip. The only difference is the coil: 24 VAC vs 24 VDC. If the control circuit is AC, swap the contactor directly; if DC, use the 1AL20 instead."},{"question":"What compliance documentation does Siemens provide for the 3RT1023-1AC20?","answer":"RoHS compliance is documented with a substance prohibition date of 01.07.2006. The part carries IEC 60947-4-1 ratings and is marked with IEC 81346-2 function code Q."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1AC20","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/3RT1023-1AC20 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}}