{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1KB40","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1024-1KB40 power contactor, size S0, 24 VDC coil, 7.5 kW at 690 V, screw and snap-on DIN rail mount.","salesMarkdown":"## Siemens 3RT1024-1KB40 — SIRIUS Power Contactor, Size S0, 24 VDC Coil The Siemens 3RT1024-1KB40 is a SIRIUS power contactor in size S0, designed for switching motor loads up to 7.5 kW at 690 V. That matters when you're sizing a 24 V bus shared with PLCs and sensors; the contactor won't pull a transient that drops the rail below the logic threshold. The 45 mm width fits a standard 9 mm pitch panel layout — five units per 225 mm rail section. Side-by-side mounting is allowed with no derating, but if you're stacking them tight, the 6 mm side clearance to grounded metal still applies for the arc chamber. In AC-2 duty (slip-ring motors, frequent start/stop) at 400 V, it delivers 5.5 kW. For AC-4 (plugging, inching, reversing) at 400 V, the current limit is 12.5 A. The AC-12 rating of 10 A covers resistive and solid-state loads at low switching frequency. The auxiliary contact block (not included) is rated for switching at 24 V: 10 A, at 60 V: 2 A, at 110 V: 1 A, at 220 V: 0.3 A. Those are the make/break capacities for the control circuit — if you're driving a PLC input at 24 V, the 10 A rating gives headroom, but at 220 V the 0.3 A limit means you can't directly switch a large contactor coil without a relay interface. Type 1 coordination (welding allowed, no fire) uses a 63 A gL/gG fuse. The varistor surge suppressor is built in across the coil — no external snubber needed for inductive load switching. IP20 on the front face protects against finger contact; the terminals are IP00, so the panel enclosure must provide the overall ingress rating. The screw terminals accept solid conductors 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). Stranded: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm². AWG equivalents: 2x (16 to 12), 2x (14 to 10), 1x 8. Electrical life depends on the switching category and current; for AC-3 motor starts at rated power, expect roughly 1 to 2 million operations before contact wear.","metaTitle":"Siemens 3RT1024-1KB40 SIRIUS Power Contactor, 24 VDC, 7.5 kW","metaDescription":"Siemens 3RT1024-1KB40 SIRIUS power contactor, size S0, 24 VDC coil, 7.5 kW at 690 V. Current production. Sourced 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":"88 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.7","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Full-scale value":"1.25","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","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","Design of the surge suppressor":"with varistor","protection class IP on the front":"IP20","Closing power of magnet coil at DC":"4.2 W","Holding power of magnet coil at DC":"4.2 W","Operating current at AC-12 maximum":"10 A","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","Protection class IP of the terminal":"IP00","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)","at ambient temperature 40 °C rated value":"40 A","Type of voltage of the control supply voltage":"DC","Type of electrical connection for main current circuit":"screw-type terminals","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Type of electrical connection for auxiliary and control current circuit":"screw-type terminals"}},"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=377839&mlfb=3RT1024-1KB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1KB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1024-1KB40?","answer":"The 3RT1023-1AL20 is a size S0 contactor with a similar footprint, but it uses a 230 V AC coil instead of the 24 V DC coil on the 3RT1024-1KB40. The 3RT1023-1AP00 has a 24 V DC coil but a different auxiliary contact configuration. Neither is a drop-in replacement without verifying the coil voltage and auxiliary wiring."},{"question":"Will 3RT1024-1KB40 drop into a panel specified for 3RT1023-1AL20?","answer":"The DIN rail footprint and size S0 frame are the same, so the mechanical fit is identical. The coil voltage differs — 24 V DC vs 230 V AC — so the control circuit must be rewired. The auxiliary contact arrangement may also differ; check the wiring diagram before swapping."},{"question":"How do I get current pricing and availability for 3RT1024-1KB40?","answer":"Submit an RFQ with the order code and quantity. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What compliance documentation does Siemens provide for 3RT1024-1KB40?","answer":"The contactor carries a reference code per DIN EN 81346-2 (Q). Standard Siemens documentation includes a CE declaration of conformity and RoHS/REACH compliance statements available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1KB40","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/3RT1024-1KB40 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}}