{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1AL20-ZW98","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1AL20-ZW98","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1AL20-ZW98","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1AL20-ZW98","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1024-1AL20-ZW98, 12.5 A AC-4 at 400 V, 5.5 kW AC-2 at 400 V, screw-type terminals, 45 mm width, current production.","salesMarkdown":"## SIRIUS S0 Power Contactor — 3RT1024-1AL20-ZW98 It's a current-production part, so you're not hunting for NOS or surplus — this one rolls off the line in Erlangen. The S0 frame size keeps it to a 45 mm wide footprint, which is slim enough to pack three across a standard 600 mm enclosure backplate without forcing a wider gland plate. Rated for AC-4 duty at 12.5 A and 400 V, meaning it's specced for the tough stuff — plugging and inching of squirrel-cage motors where the contactor opens under full load. The AC-2 rating at 5.5 kW and 400 V covers wound-rotor motor starting, and it'll handle 7.5 kW at both 500 V and 690 V in AC-3 service. That's a solid spread for a 45 mm device, and the 25 A gL/gG fuse for Type 2 coordination keeps the short-circuit protection clean. The 12.5 A AC-4 rating is the one that decides whether this contactor lives or dies in reversing or jogging applications. If your line has a conveyor that reverses direction under load or a press that jogs into position, that 12.5 A figure is your real-world limit, not the higher AC-3 number. The 5.5 kW AC-2 rating at 400 V handles wound-rotor motors where the starting current stays lower but the duty cycle is longer. The screw-type terminals on the main circuit accept 2x (1 to 2.5 mm²) solid or 2x (2.5 to 6 mm²) stranded, with a max of 2x 10 mm². That's enough for the 12.5 A feed without needing a ferrule or bootlace. The auxiliary contacts take 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, up to 4 mm² max — standard for control wiring in a 24 VDC loop. Side-by-side mounting is allowed with no derating down to -25 °C, but above that you'll want the 6 mm air gap between units if the ambient climbs toward 60 °C.","metaTitle":"Siemens 3RT1024-1AL20-ZW98 SIRIUS S0 Power Contactor, 12.5 A","metaDescription":"Siemens SIRIUS 3RT1024-1AL20-ZW98 S0 power contactor. 12.5 A AC-4 at 400 V, 5.5 kW AC-2. Screw terminals, 45 mm wide. Current-production, sourced to order against RFQ.","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 60 Hz":"0.85 ... 1.1","At The Side":"6 mm","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 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":"230 V","at 500 V rated value":"7.5 kW","at 60 Hz rated value":"230 V","at 690 V rated value":"7.5 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":"5.5 kW","at AC-4 at 400 V rated value":"12.5 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":"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","Inductive power factor with closing power of the coil":"0.72","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=85542&mlfb=3RT1024-1AL20-ZW98","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1AL20-ZW98/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 3RT1024-1AL20-ZW98?","answer":"The closest peer is the 3RT1023-1AL20, which shares the same S0 frame size and screw-terminal format. The key difference is the AC-4 current rating: the 3RT1024-1AL20-ZW98 is rated at 12.5 A AC-4 at 400 V, while the 3RT1023-1AL20 is rated lower. If your application needs the full 12.5 A AC-4, the 3RT1024 is the correct choice; the 3RT1023 would be undersized for that duty. The footprint and mounting are identical, so a swap would not require rewiring or re-drilling the backplate."},{"question":"What are the physical dimensions of the 3RT1024-1AL20-ZW98?","answer":"The contactor measures 45 mm wide, 85 mm tall, and 91 mm deep. It mounts on a 35 mm DIN rail per DIN EN 50022."},{"question":"What conductor sizes does the 3RT1024-1AL20-ZW98 accept?","answer":"The main circuit screw terminals accept 2x (1 to 2.5 mm²) solid or 2x (2.5 to 6 mm²) stranded, with a maximum of 2x 10 mm². The auxiliary contacts accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, up to 4 mm² maximum."},{"question":"Will the 3RT1024-1AL20-ZW98 drop into a panel specified around the 3RT1023-1AL20 without rewiring?","answer":"Yes, both are S0 frame size on a 35 mm DIN rail with screw terminals. The footprint and terminal layout are identical, so a direct swap is mechanically and electrically compatible. The only difference is the current rating — the 3RT1024-1AL20-ZW98 carries a higher AC-4 rating, so it's a drop-in upgrade if the existing wiring is sized for the higher current."},{"question":"What compliance documentation is available for the 3RT1024-1AL20-ZW98?","answer":"As a Siemens SIRIUS product, this contactor is designed to meet IEC 60947-4-1 and relevant UL/CSA standards. The standard documentation package includes a CE declaration of conformity and a RoHS compliance statement. Specific UL file numbers or REACH declarations can be provided with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1AL20-ZW98","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/3RT1024-1AL20-ZW98 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}}