{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1AU00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1AU00","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1AU00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1AU00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3-pole, 4.5 kW at 500 V, 5.5 kW at 690 V, screw terminals, 45 mm wide.","salesMarkdown":"It carries 4.5 kW at 500 V and 5.5 kW at 690 V in AC-3 duty, which is the standard motor-switching category — meaning it handles the inrush and breaking of induction motors at those power levels without welding the contacts. The 3-pole main contact block has 3 normally-open contacts and no normally-closed contacts, so it's a straight motor starter contactor, not a reversing or star-delta configuration. The 45 mm width means it occupies one standard modular unit, so it fits neatly into a row of motor starters or alongside a thermal overload relay. The front face carries an IP20 rating — safe for finger contact in an enclosure — while the terminals themselves are IP00, meaning they rely on the panel's own protection. Side-by-side mounting is allowed with no derating gap, so you can pack multiple contactors tight on the rail. Main circuit terminals are screw-type, accepting solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or max 2x 0.75–4 mm². For stranded wire, the range is 2x 1–2.5 mm², 2x 2.5–6 mm², or max 2x 10 mm². AWG equivalents are 2x 16–12, 2x 14–10, and 1x 8. This covers most panel wiring from control circuits up to moderate motor feeders. The pollution degree is 3 (conductive or dry non-conductive pollution), typical for industrial environments. ## Coil and auxiliary ratings The coil is rated for 50 Hz at 240 V, with an operating range of 0.8 to 1.1 times the rated voltage at 50 Hz. That means it picks up reliably down to about 192 V and holds in up to 264 V. For auxiliary contacts (not built-in, but add-on blocks are available), the rated currents at various voltages are: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. ## Short-circuit protection and coordination For Type 1 coordination (contactor may need replacement after a fault), the fuse can be gL/gG 63 A. This lets you balance protection level against fuse size depending on the panel's selectivity requirements.","metaTitle":"Siemens 3RT1023-1AU00 SIRIUS Power Contactor, S0, 4.5 kW at","metaDescription":"Siemens SIRIUS 3RT1023-1AU00 power contactor, size S0, 3-pole, 4.5 kW at 500 V, 5.5 kW at 690 V. Screw terminals, 45 mm wide. Current production. RFQ for pricing.","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","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":"240 V","at 500 V rated value":"4.5 kW","at 690 V rated value":"5.5 kW","Instantaneous Contact":"0","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=331799&mlfb=3RT1023-1AU00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1AU00/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"It is rated for 4.5 kW at 500 V and 5.5 kW at 690 V in AC-3 duty. The AC-4 (plugging/inching) current rating is 8.5 A at 400 V."},{"question":"What is the physical size and mounting of the 3RT1023-1AU00?","answer":"It is 45 mm wide, 85 mm high, and 91 mm deep. It mounts via screw or snap-on onto a 35 mm DIN rail per EN 50022."},{"question":"What wire sizes does the screw terminal accept?","answer":"For solid wire: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², max 2x 0.75–4 mm². For stranded: 2x 1–2.5 mm², 2x 2.5–6 mm², max 2x 10 mm². AWG equivalents: 2x 16–12, 2x 14–10, 1x 8."},{"question":"What is the closest functional alternative to the 3RT1023-1AU00?","answer":"The 3RT1023-1AL20 is a sibling in the same S0 frame size and SIRIUS family. The main difference is the coil voltage — the -1AL20 uses a 24 V AC/DC coil, while the -1AU00 uses a 240 V 50 Hz coil. They share the same power ratings, terminal layout, and mounting footprint, so swapping one for the other requires only a coil voltage change in the panel design."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1AU00","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/3RT1023-1AU00 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}}