{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-3BM40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-3BM40","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-3BM40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BM40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 220 V AC coil, screw-type terminals, 45 mm width, IP20 front.","salesMarkdown":"The 220 V AC coil is the control voltage — match it to your control transformer or PLC output card. At 500 V and 690 V, the motor power rating is 7.5 kW, so this contactor handles a standard 7.5 kW induction motor on a 500 V or 690 V line. The auxiliary contact block is rated for switching at various control voltages: 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. That covers pilot duty for PLC inputs, relay coils, and indicator lamps. Side-by-side mounting is permitted with no derating, which saves rail space in dense cabinets. The front of the contactor is IP20, meaning finger-safe for panel installation. Main circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²) solid/stranded, 2x (2.5 to 6 mm²), or up to 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), or 1x 8. Solid wire range is 2x (0.25 to 2.5 mm²). ## Coordination & Environment This matters for selectivity studies and SCCR compliance. Coil consumption: 5.4 W closing power and 5.4 W holding power (DC). The holding power is the same as closing, so the coil driver sees a constant load — no power-save circuit inside this variant.","metaTitle":"Siemens 3RT1024-3BM40 SIRIUS Power Contactor, S0, 220 VAC Co","metaDescription":"Siemens 3RT1024-3BM40 SIRIUS power contactor, size S0, 220 VAC coil, 45 mm width, screw terminals. AC-4 12.5 A at 400 V. Active production. RFQ for pricing.","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","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"220 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=508139&mlfb=3RT1024-3BM40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BM40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional equivalent to 3RT1024-3BM40?","answer":"The 3RT1023-1AL20 is a close functional peer within the same SIRIUS S0 frame family. The key difference is the coil voltage — the 3RT1023-1AL20 uses a 230 V AC coil versus the 220 V AC coil on this part. For a 220 V control circuit, this part is the correct match; the 3RT1023-1AL20 would drop in mechanically but may not pull in reliably at 220 V if the control voltage sags."},{"question":"What is the depth of the 3RT1024-3BM40?","answer":"The depth is 100 mm, which is standard for the S0 frame size and fits typical 200 mm deep enclosures with clearance for wiring."},{"question":"What solid wire sizes does the 3RT1024-3BM40 accept?","answer":"The main terminals accept 2x (0.25 to 2.5 mm²) solid wire. For stranded wire, the range is 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²), with a maximum of 2x 10 mm²."},{"question":"Will 3RT1024-3BM40 drop into a panel specified for 3RT1023-1AL20?","answer":"Mechanically yes — same S0 frame, same 45 mm width, same DIN rail mounting. The difference is the coil: this part is 220 V AC, the 3RT1023-1AL20 is 230 V AC. If your control transformer is tapped at 220 V, this is the correct part. If it's 230 V, the 3RT1023-1AL20 is the better fit. Check the control voltage before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-3BM40","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/3RT1024-3BM40 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}}