{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, size S0, 24 VDC coil, screw-type terminals, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"It mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022, with a width of 45 mm, height 85 mm, and depth 101 mm — a compact footprint for a 24 VDC-coil contactor rated to switch 10 A at 24 V and 2 A at 60 V in DC circuits. AC-2 at 400 V is rated at 4 kW, suited for slip-ring motor starting. At 690 V the contactor handles 5.5 kW, and at 500 V it handles 4.5 kW — these are the motor power ratings for standard three-phase induction motors. The DC coil draws 5.4 W both for closing and holding — no power drop after pick-up, so the supply must sustain that continuously. Rated control supply voltage is 48 V DC. The contactor also carries DC switching ratings at 110 V (1 A) and 220 V (0.3 A), useful for breaking DC auxiliary loads in the same panel. ## Short-circuit coordination and wiring Main circuit terminals accept screw-type connections: solid 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), max 2x (0.75...4 mm²), or stranded 2x (1...2.5 mm²), 2x (2.5...6 mm²), max 2x 10 mm². AWG equivalents are 2x (16...12), 2x (14...10), 1x 8. Side-by-side mounting is permitted with 6 mm spacing to adjacent devices. Front face is IP20 (finger-safe); the terminals themselves are IP00 (no protection), so the panel enclosure provides the overall ingress protection. Pollution degree 3 (industrial environment with conductive pollution).","metaTitle":"Siemens 3RT1023-1BW40 SIRIUS Power Contactor, S0, 24 VDC, 10","metaDescription":"Siemens SIRIUS 3RT1023-1BW40 power contactor, size S0, 24 VDC coil. AC-4 8.5 A at 400 V. Screw/snap-on DIN rail. Current lifecycle. 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":"48 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":"4.5 kW","at 690 V rated value":"5.5 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":"4 kW","at AC-4 at 400 V rated value":"8.5 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=444475&mlfb=3RT1023-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for the 3RT1023-1BW40?","answer":"AC-4 at 400 V is 8.5 A; AC-2 at 400 V is 4 kW; at 690 V it handles 5.5 kW; at 500 V it handles 4.5 kW. These cover reversing duty and standard motor starting."},{"question":"Where can I buy the 3RT1023-1BW40?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"Will the 3RT1023-1BW40 drop into a panel specified for the 3RT1023-1AL20?","answer":"Both are S0-frame SIRIUS contactors with the same physical footprint (45 mm width, 85 mm height, 101 mm depth) and identical DIN-rail mounting. The difference is the coil voltage — the 1BW40 uses 48 V DC, while the 1AL20 uses a different coil rating. Panel cutouts and wiring terminals are the same; verify the control voltage matches your circuit before swapping."},{"question":"What compliance documentation does Siemens provide for the 3RT1023-1BW40?","answer":"As a SIRIUS product, it carries CE marking for the European market and is designed to meet relevant IEC/EN standards for contactors (IEC 60947-4-1). RoHS and REACH declarations are available from Siemens documentation. The reference code per DIN EN 81346-2 is Q."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1BW40","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/3RT1023-1BW40 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}}