{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1024-1BF40, S0 frame, 110 VAC coil, 7.5 kW at 400 V AC-3, screw terminals, DIN-rail mount.","salesMarkdown":"The Siemens 3RT1024-1BF40 is a SIRIUS power contactor in the S0 frame size, rated for 7.5 kW at both 400 V and 690 V AC-3 duty — meaning it handles motor loads up to that power in standard three-phase induction motor applications. The 110 VAC coil pulls 5.4 W on close and hold, so the control transformer sizing is straightforward. AC-3 switching current is 7.5 kW at 400 V and the same at 690 V — that's the motor-rating curve you care about for pump, fan, and compressor duty. If the load is reversing or plugging (AC-4), the contactor is rated 12.5 A at 400 V, which is lower than the AC-3 figure; derate accordingly for high-inertia or frequent jogging applications. The coil holds at 110 VAC nominal. Closing and holding power is 5.4 W DC, which keeps the thermal load on the control transformer low. Short-circuit coordination is specified: type 2 coordination requires a 25 A gL/gG fuse; type 1 coordination allows a 63 A gL/gG fuse. That difference matters for selectivity with upstream breakers — if you need the contactor to survive a fault without replacement, spec the type 2 fuse. The front of the contactor is IP20 (finger-safe), but the terminals are IP00 — keep that in mind for clearance inside the panel; no touch-safe protection on the power connections. Main current circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²) solid or 2x (2.5 to 6 mm²) stranded, with a maximum of 2x 10 mm². The auxiliary/control terminals are smaller: 2x (0.5 to 1.5 mm²) solid and 2x (0.75 to 2.5 mm²) stranded, max 2x (0.75 to 4 mm²). AWG equivalents are 2x (16 to 12) for the smaller terminals and 2x (14 to 10) for the main, with 1x 8 AWG maximum on the main. Side-by-side mounting is allowed, with a 6 mm spacing required at the side for heat dissipation.","metaTitle":"Siemens 3RT1024-1BF40 SIRIUS Power Contactor, 110 VAC Coil,","metaDescription":"Siemens SIRIUS 3RT1024-1BF40 power contactor, 110 VAC coil, S0 frame, 7.5 kW at 400 V AC-3. DIN-rail mount, IP20 front, current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 mm","Solid":"2x (0.5 ... 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":"110 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=1804&mlfb=3RT1024-1BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BF40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional peer to 3RT1024-1BF40?","answer":"The 3RT1023-1AL20 is a similar SIRIUS S0 contactor but with a 24 VDC coil instead of 110 VAC. It shares the same frame, mounting footprint, and main contact ratings (7.5 kW AC-3 at 400 V), so it can drop into the same panel without rewiring the power circuit — only the coil supply needs to change."},{"question":"Where can I buy 3RT1024-1BF40?","answer":"We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What compliance documentation does Siemens provide for 3RT1024-1BF40?","answer":"As a SIRIUS series contactor, it carries CE marking and is designed to meet IEC 60947-4-1. RoHS and REACH declarations are available from Siemens; UL and CSA listings are typical for the S0 frame but should be verified against the specific variant's certification markings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1BF40","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/3RT1024-1BF40 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}}