{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1BF40-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1BF40-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1BF40-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BF40-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1023-1BF40-ZX95 power contactor, size S0, 110 V DC magnet coil, screw-type terminals, IP20 front / IP00 terminal protection, 45 mm width, for 35 mm DIN rail.","salesMarkdown":"## SIRIUS S0 power contactor for motor switching The Siemens SIRIUS 3RT1023-1BF40-ZX95 is a size S0 power contactor with a 110 V DC magnet coil, built for switching motor loads in control panels up to 4 kW at 400 V in AC-3 duty. Rated for 4.5 kW at 500 V and 5.5 kW at 690 V, it covers a range of line voltages common in industrial supply systems. Depth of 101 mm and height of 85 mm leave clearance for wiring duct and adjacent devices. Side-by-side mounting is permitted with 6 mm spacing at the side, which keeps the panel layout tight. Main current circuit uses screw-type terminals accepting 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 conductors take 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm². AWG equivalents for main contacts: 2x (16 to 12), 2x (14 to 10), or 1x 8. Magnet coil draws 5.4 W DC for both closing and holding, so the control transformer and wiring need to support that inrush without voltage sag. Coil operates on 110 V DC; auxiliary contact ratings for DC switching are 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, and 6 A at 230 V. ## Protection and coordination Front protection is IP20 (finger-safe); terminal area is IP00 (requires enclosure protection). ## Environmental limits","metaTitle":"Siemens 3RT1023-1BF40-ZX95 SIRIUS Power Contactor, 110 V Coi","metaDescription":"Siemens SIRIUS 3RT1023-1BF40-ZX95 power contactor, size S0, 110 V DC coil. AC-3 rated 4 kW at 400 V. Screw terminals, IP20 front. Current production. 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":"110 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=20748&mlfb=3RT1023-1BF40-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BF40-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1023-1BF40-ZX95?","answer":"The 3RT1023-1AL20 is a functional peer in the same SIRIUS S0 frame, but verify coil voltage and terminal configuration against your BOM before substituting — the 1AL20 uses a different coil rating."},{"question":"What compliance documentation does the SIRIUS brand provide for this contactor?","answer":"Standard Siemens SIRIUS documentation includes RoHS and REACH declarations; UL and IEC certifications are typically listed on the nameplate and in the technical data sheet."},{"question":"Will 3RT1023-1BF40-ZX95 drop into a panel specified around 3RT1023-1AL20 without rewiring?","answer":"Both are S0 frame contactors with the same 45 mm width and DIN rail mounting, so the mechanical fit is identical. Terminal layout and screw-type termination are the same, but the coil voltage differs — the 1BF40 uses 110 V DC while the 1AL20 uses a different coil rating, so the control wiring must match."},{"question":"What is the listed depth of 3RT1023-1BF40-ZX95?","answer":"The depth is 101 mm."},{"question":"Where can I buy 3RT1023-1BF40-ZX95 and how is it quoted?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Submit an RFQ for current pricing and availability — confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1BF40-ZX95","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/3RT1023-1BF40-ZX95 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}}