{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1AF04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1AF04","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1AF04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1AF04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1023-1AF04, S0 frame, 3 NO main contacts, screw-type terminals, 45 mm width, AC-4 8.5 A at 400 V.","salesMarkdown":"It carries 3 normally-open main contacts and zero normally-closed main contacts, so it is a straight three-pole make device — no auxiliary break on the main poles. For less demanding AC-2 duty (starting and running slip-ring motors), it is rated 4 kW at 400 V. The AC-12 maximum operating current of 10 A covers resistive loads like heaters. For motor switching at higher voltages, the contactor is rated 4.5 kW at 500 V and 5.5 kW at 690 V. That makes it suitable for 400 V class motors in the 4 kW range, and for 690 V applications where the motor draw fits the current limit. DC switching capacity is specified: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. These are resistive DC ratings — inductive DC loads will need derating or arc suppression. Short-circuit coordination is defined: Type 1 coordination requires a 63 A gL/gG fuse; Type 2 coordination (where the contactor must remain operational after a fault) requires a 25 A gL/gG fuse. This is critical for panel builders sizing protection. The terminal body itself is IP00, so live parts are exposed behind the panel door. Main circuit terminals are screw-type, accepting solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², max 2x 0.75–4 mm². Stranded conductors: 2x 1–2.5 mm², 2x 2.5–6 mm², max 2x 10 mm². AWG equivalents: 2x 16–12, 2x 14–10, 1x 8. The 2x (two-wire) capacity is useful for looping through to a second device. Side-by-side mounting is permitted with 6 mm spacing on the side, which saves panel width when ganging multiple contactors. Same part, different passport: the 3RT1023-1AF04 is the standard European-spec order code. If you see a 3RT1023-1AL20 in your panel BOM, that is a coil-voltage variant — the 1AF04 has a 110 V 50 Hz coil. The mechanical frame and contact ratings are identical, so the swap is a coil-voltage decision, not a fit decision. Let me be transparent: if your panel was wired for 110 V coil, the 1AF04 drops straight in without rewiring the power circuit.","metaTitle":"Siemens 3RT1023-1AF04 SIRIUS Power Contactor, S0 Frame, 3-Po","metaDescription":"Siemens 3RT1023-1AF04 SIRIUS power contactor, S0 frame, 3 NO main contacts, screw terminals, 45 mm width, AC-4 8.5 A at 400 V. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"140 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","Maximum":"2 000 m","at 50 Hz":"0.8 ... 1.1","At The Side":"6 mm","On The Front":"IP20","1 Rated Value":"50 Hz","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Size of contactor":"S0","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":"110 V","at 500 V rated value":"4.5 kW","at 690 V rated value":"5.5 kW","Instantaneous Contact":"2","Side-by-side mounting":"Yes","For Main Current Circuit":"screw-type terminals","Single Or Multi-Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","at AC-2 at 400 V rated value":"4 kW","at AC-4 at 400 V rated value":"8.5 A","Operating current at AC-12 maximum":"10 A","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","at AWG conductors for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","Reference code acc. to DIN EN 81346-2":"Q","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","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","at ambient temperature 40 °C rated value":"40 A","Apparent holding power of magnet coil at AC":"7.8 V·A","Apparent pick-up power of magnet coil at AC":"61 V·A","Type of voltage of the control supply voltage":"AC","Inductive power factor with closing power of the coil":"0.82","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","Of The Contactor With Added Electronics-Compatible 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=301851&mlfb=3RT1023-1AF04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1AF04/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative if I cannot get the 3RT1023-1AF04?","answer":"The 3RT1023-1AL20 is the same S0 frame contactor with a different coil voltage (230 V 50 Hz instead of 110 V 50 Hz). The mechanical ratings, terminal capacities, and footprint are identical. The choice is purely coil voltage."},{"question":"What are the main contact ratings for motor duty?","answer":"AC-4 (reversing/plugging) is 8.5 A at 400 V. AC-2 (slip-ring motor start/run) is 4 kW at 400 V. Motor power ratings are 4.5 kW at 500 V and 5.5 kW at 690 V."},{"question":"What fuse coordination is required?","answer":"Type 1 coordination requires a 63 A gL/gG fuse. Type 2 coordination (contactor remains operational after fault) requires a 25 A gL/gG fuse."},{"question":"What is the physical size and mounting?","answer":"Width 45 mm, height 85 mm, depth 140 mm. Mounts on 35 mm DIN rail per DIN EN 50022 via screw or snap-on. Side-by-side mounting allowed with 6 mm spacing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1AF04","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/3RT1023-1AF04 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}}