{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1BD40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1BD40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1BD40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BD40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1024-1BD40-1AA0, screw-type terminals, 45 mm width, IP20 front, rated 7.5 kW at 400 V AC-3.","salesMarkdown":"It carries a 7.5 kW motor rating at both 400 V and 690 V AC-3 duty, so it handles standard 400 V three-phase motors up to that power and also works at 690 V without derating the power rating — useful on 690 V line supplies common in mining or heavy industry. For reversing or plugging duty (AC-4), the contactor is rated 12.5 A at 400 V, which is the current it can interrupt under those higher-stress switching conditions. The S0 frame keeps the width to 45 mm, and the 85 mm height and 101 mm depth fit standard 35 mm DIN rail enclosures with side-by-side mounting permitted without derating. Side-by-side mounting is allowed, with a 6 mm clearance specified at the side — no extra air gap needed between adjacent contactors of the same frame. Main circuit terminals accept solid/stranded copper: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm², with AWG equivalents 2x (16 to 12), 2x (14 to 10), 1x 8. Auxiliary contact terminals are smaller: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Strip lengths follow standard screw-terminal practice — no special tooling needed. For Type 2 coordination (contactor remains operable after a fault), the fuse drops to 25 A gL/gG. These are the manufacturer's specified maximums — the actual fuse size depends on the upstream breaker and cable rating, but these values set the coordination boundary. ## Coil and auxiliary ratings The magnet coil draws 5.4 W both for closing and holding (DC), so the coil power supply sees a constant load once picked up. Auxiliary contact switching capacity is rated at various voltages: 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 — these are the maximums for the built-in auxiliary contacts, not the main poles.","metaTitle":"Siemens 3RT1024-1BD40-1AA0 SIRIUS S0 Power Contactor, 7.5 kW","metaDescription":"Siemens SIRIUS S0 power contactor 3RT1024-1BD40-1AA0, rated 7.5 kW at 400 V AC-3. Screw terminals, IP20 front, DIN rail mount. Active production, available to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 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 The Side":"6 mm","Rated Value":"42 V","On The Front":"IP20","Initial Value":"0.8","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","Full-scale value":"1.1","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 500 V rated value":"7.5 kW","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","Closing power of magnet coil at DC":"5.4 W","Holding power of magnet coil at DC":"5.4 W","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","Type of voltage of the control supply voltage":"DC","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=344099&mlfb=3RT1024-1BD40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BD40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1024-1BD40-1AA0 and get a price?","answer":"This part is sourced to order against an RFQ through our independent distribution network. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional alternative to 3RT1024-1BD40-1AA0?","answer":"The 3RT1023-1AL20 is a smaller S0-frame contactor with lower motor ratings. The 3RT1024-1BD40-1AA0 is the higher-rated sibling, so a panel specified around the 3RT1023 would need to verify that the larger contactor's 45 mm width and terminal layout fit the existing wiring and enclosure space — the footprint is the same S0 frame, but the power terminals and coil connections should be checked against the original layout."},{"question":"What compliance documentation is available for this contactor?","answer":"As a Siemens SIRIUS product, the 3RT1024-1BD40-1AA0 carries CE marking for the European market and is designed to meet IEC/EN 60947-4-1 standards for contactors and motor starters. RoHS and REACH declarations are available from Siemens documentation. UL and CSA listings are standard for the SIRIUS line, but specific file numbers should be confirmed against the nameplate marking on the unit received."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1BD40-1AA0","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/3RT1024-1BD40-1AA0 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}}