{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-3BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-3BB40","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-3BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1024-3BB40, 24 VDC coil, 3 NO main contacts, 5.5 kW at 400 V AC-3, screw terminals, IP20 front.","salesMarkdown":"It is rated for 5.5 kW motor switching at 400 V in AC-3 duty and 12.5 A in AC-4 at 400 V. The 5.5 kW AC-3 rating at 400 V is the motor-switching figure that governs real-world conveyor, pump, and fan loads — not the resistive AC-1 number. AC-3 means switching starting currents up to 6–8× rated without welding the contacts. AC-4 at 12.5 A covers reversing or inching duty where the contactor breaks full motor current at standstill; if your application cycles under load, size on the AC-4 curve. The 24 VDC coil draws 5.4 W during pick-up and holds at the same 5.4 W — a linear solenoid, not a power-saver. Verify your 24 VDC supply can sustain the inrush without droop; a 5.4 W continuous load on a shared bus adds up across multiple contactors. Type 2 coordination calls for a 25 A gL/gG fuse upstream; Type 1 allows a 63 A fuse. Type 2 is the standard for IEC panels that must survive a short-circuit without welding the contactor — spec the 25 A fuse unless your panel design explicitly accepts Type 1 damage.","metaTitle":"Siemens 3RT1024-3BB40 SIRIUS Power Contactor, 24 VDC Coil, 5","metaDescription":"Siemens 3RT1024-3BB40 SIRIUS S0 power contactor, 24 VDC coil, 3 NO main contacts, 5.5 kW at 400 V AC-3. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"85 mm","At The Side":"6 mm","Rated Value":"24 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 400 V rated value":"5.5 kW","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","With Type Of Assignment 2 Required":"fuse gL/gG: 25 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","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","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","operating current at AC-15 at 230 V rated value":"6 A","operating current at AC-15 at 400 V rated value":"3 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","type of connectable conductor cross-sections at AWG conductors for auxiliary contacts":"2x (24 ... 14)"}},"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=442971&mlfb=3RT1024-3BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1024-3BB40 and how do I get a price?","answer":"This part is sourced and quoted 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":"Will 3RT1024-3BB40 drop into a panel that was specified around 3RT1023-1AL20 without rewiring?","answer":"Both are SIRIUS S0 contactors on the same 45 mm DIN-rail footprint, but the coil voltage and terminal arrangement differ. The 3RT1024-3BB40 uses a 24 VDC coil; the 3RT1023-1AL20 uses a different coil voltage. Verify the coil supply and check the screw-terminal layout against your existing wiring before swapping."},{"question":"What is 3RT1024-3BB40's listed depth (100 mm) on this component line?","answer":"The depth is 100 mm. That dimension includes the body and the front-mounted terminals; allow clearance for wiring and finger-safe covers in the enclosure."},{"question":"What compliance documentation does this brand provide for 3RT1024-3BB40?","answer":"As a Siemens SIRIUS product, the 3RT1024-3BB40 carries CE marking and is designed to meet IEC/EN 60947-4-1. RoHS and REACH declarations are available from Siemens. The IP20 front protection and pollution degree 3 are specified on the nameplate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-3BB40","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/3RT1024-3BB40 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}}