{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-3BD40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-3BD40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-3BD40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BD40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, S0, 3RT1024-3BD40-1AA0, 24 V DC coil, 10 A at 24 V DC, screw terminals, IP20 front, 45 mm width.","salesMarkdown":"## SIRIUS S0 power contactor — 24 V DC coil, screw terminals The 24 V DC coil draws 5.4 W during both closing and holding, so the control transformer and power supply need to budget for that steady-state draw — no inrush spike to size for, but the continuous 5.4 W per contactor adds up across a multi-contactor panel. The DC switching ratings are the ones that govern fit for this contactor: 10 A at 24 V DC, 2 A at 60 V DC, 1 A at 110 V DC, 0.3 A at 220 V DC, and 6 A at 230 V DC. These are not continuous thermal currents — they are the make/break capacities for DC loads, where arc extinction is harder than AC. For AC motor duty, the contactor is rated 5.5 kW at AC-2, 400 V, and 12.5 A at AC-4, 400 V. AC-2 covers slip-ring motor starting; AC-4 covers plugging and inching. The AC-12 rating of 10 A operating current applies for resistive loads. Main circuit connections use screw-type terminals. The terminal accepts solid or stranded conductors: 2x (0.25 to 2.5 mm²), 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or up to 2x 10 mm². AWG equivalents are 2x (16 to 12), 2x (14 to 10), or 1x 8. The 45 mm width and 85 mm height fit the S0 footprint; depth is 101 mm, which matters for enclosure depth clearance when the contactor is mounted with auxiliary blocks or a surge suppressor on the front. IP20 on the front, IP00 at the terminals — the terminals are live when wired, so the panel door or a terminal cover provides the touch protection. ## Coordination and fusing For type 2 coordination (contactor remains operational after a fault), the fuse is gL/gG 25 A. These are per IEC 60947-4-1 and define the short-circuit protection the contactor needs to meet its rated SCCR.","metaTitle":"Siemens 3RT1024-3BD40-1AA0 SIRIUS Power Contactor, S0, 24 V","metaDescription":"Siemens SIRIUS 3RT1024-3BD40-1AA0 power contactor, S0 frame, 24 V DC coil, 10 A at 24 V DC, screw terminals, IP20 front. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 mm","Solid":"2x (0.25 ... 2.5 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 (0.25 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"spring-loaded terminals","at ambient temperature 40 °C rated value":"40 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","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=421914&mlfb=3RT1024-3BD40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BD40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 3RT1024-3BD40-1AA0 contactor?","answer":"The depth is 101 mm. This is the dimension from the DIN rail mounting surface to the front of the contactor body, not including any auxiliary blocks or surge suppressors mounted on the front face."},{"question":"What wire sizes does the 3RT1024-3BD40-1AA0 accept on the main terminals?","answer":"The screw terminals accept solid or stranded conductors: 2x (0.25 to 2.5 mm²), 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or up to 2x 10 mm². AWG equivalents are 2x (16 to 12), 2x (14 to 10), or 1x 8."},{"question":"Where can I buy the 3RT1024-3BD40-1AA0 and how is it quoted?","answer":"This contactor is sourced through independent distribution channels. It is quoted to order against an RFQ, with availability and current pricing confirmed at quote time."},{"question":"What is the closest functional alternative to the 3RT1024-3BD40-1AA0?","answer":"The 3RT1023-1AL20 is a peer in the same SIRIUS S0 family, but it uses a different coil voltage and terminal configuration. The 3RT1024-3BD40-1AA0 has a 24 V DC coil and screw terminals; verify the peer's coil rating and terminal type before substituting in a panel designed around this order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-3BD40-1AA0","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/3RT1024-3BD40-1AA0 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}}