{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1BD40","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S0 frame, 24 VDC coil, screw-type terminals, snap-on 35 mm DIN rail mounting.","salesMarkdown":"The coil is rated at 24 VDC with a holding power of 5.4 W — that's the steady-state draw the PLC output or relay must sink. Closing and holding power are identical at 5.4 W, so there's no inrush spike to trip a marginal 24 VDC supply. The contactor carries a maximum operating current of 10 A under AC-12 duty (resistive loads), and at 24 V rated value it switches 10 A in DC circuits. For motor duty, it's rated at 4 kW at AC-2 at 400 V, and 8.5 A at AC-4 at 400 V for reversing or inching applications. That's a practical difference: if the upstream protection is sized for Type 1, the contactor is sacrificial in a fault event. ## Integration notes The contactor carries a mechanical endurance of 10 million typical operations — that's the rated life before the mechanism wears, not the electrical life under load. Electrical life depends on the switched current and duty cycle; for resistive loads at rated current it will be lower than the mechanical figure. Terminal wiring: the main circuit accepts solid conductors 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). For stranded conductors, it accepts 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm². AWG equivalents are 2x (16 to 12), 2x (14 to 10), 1x 8. Strip length and torque spec aren't in this record, but the terminal type is screw-type, so use a torque screwdriver per Siemens installation instructions.","metaTitle":"Siemens 3RT1023-1BD40 SIRIUS Power Contactor, S0 Frame, 24 V","metaDescription":"Siemens 3RT1023-1BD40 SIRIUS power contactor, S0 frame, 24 VDC coil, 10 A at AC-12. Screw terminals, snap-on DIN rail mount. Current production status.","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":"42 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=83684&mlfb=3RT1023-1BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BD40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"The 3RT1023-1BD40 has a 24 VDC coil with 5.4 W holding power, maximum operating current of 10 A at AC-12, 4 kW at AC-2 at 400 V, and 8.5 A at AC-4 at 400 V. It requires a 25 A gL/gG fuse for Type 2 coordination."},{"question":"Does the 3RT1023-1BD40 fit a standard DIN rail panel?","answer":"Yes, it mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022. The S0 frame is 45 mm wide, 85 mm tall, and 101 mm deep, with 6 mm side spacing for ganging."},{"question":"What is the closest functional alternative to the 3RT1023-1BD40?","answer":"The 3RT1015-1BB42 is a smaller-frame SIRIUS contactor (S00 frame) with a 24 VDC coil, but it has lower current ratings and a different footprint. It will not drop into a panel wired for the S0 frame without rewiring the main conductors and checking clearance. The 3RT1023-1BD40 is the correct S0-frame choice for 10 A AC-12 or 4 kW motor duty."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1BD40","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/3RT1023-1BD40 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}}