{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1023-1BF40, 110 V DC coil, screw-type terminals, IP20 front, 45 mm width.","salesMarkdown":"It carries a 110 V DC coil that draws 5.4 W during both closing and holding — the DC hold is the same as the pull-in power, so the coil driver sees a constant load once picked. The contactor is rated for AC-2 duty at 400 V at 4 kW and AC-4 at 400 V at 8.5 A, which covers reversing and inching applications where the load is switched under full motor current. For AC-12 resistive loads it handles 10 A maximum. Motor power ratings are 4.5 kW at 500 V and 5.5 kW at 690 V, making it suitable for 400 V class motors in the 4 kW range with headroom. The 45 mm width and 85 mm height fit standard S0 panel layouts. Side-by-side mounting is permitted, which saves rail space in multi-contactor groups. Screw-type terminals on both main and auxiliary circuits accept 2x (0.5...1.5 mm²) solid or 2x (0.75...2.5 mm²) stranded for control wiring, and up to 2x 10 mm² on the main poles. AWG equivalents are 2x (16...12) solid and 2x (14...10) stranded for mains. ## Protection and environment Type 1 coordination requires a 63 A gL/gG fuse; Type 2 coordination needs a 25 A gL/gG fuse. This lets the designer choose between simpler coordination (Type 1) or reduced downstream damage after a fault (Type 2). RoHS compliance is confirmed with a substance prohibition date of 01.07.2006, covering the original EU RoHS directive.","metaTitle":"Siemens 3RT1023-1BF40 SIRIUS Power Contactor, 110 V coil, S0","metaDescription":"Siemens 3RT1023-1BF40 SIRIUS power contactor, size S0, 110 V DC coil, 5.4 W hold, screw terminals, IP20 front. Active 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","Rated Value":"110 V","On The Front":"IP20","Initial Value":"0.8","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.1","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","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","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"4 kW","at AC-4 at 400 V rated value":"8.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","closing power of magnet coil at DC":"5.4 W","holding power of magnet coil at DC":"5.4 W","reference code acc. to IEC 81346-2":"Q","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","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","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","Of The Contactor With Added Electronically Optimized 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=187545&mlfb=3RT1023-1BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BF40/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for the 3RT1023-1BF40?","answer":"AC-2 at 400 V: 4 kW. AC-4 at 400 V: 8.5 A. Motor power at 500 V: 4.5 kW. Motor power at 690 V: 5.5 kW."},{"question":"What wire sizes does the 3RT1023-1BF40 accept?","answer":"Main terminals: 2x (0.5...1.5 mm²) solid, 2x (0.75...2.5 mm²) stranded, max 2x (0.75...4 mm²). Auxiliary terminals: 2x (1...2.5 mm²) solid, 2x (2.5...6 mm²) stranded, max 2x 10 mm². AWG equivalents: main 2x (16...12) solid, 2x (14...10) stranded; auxiliary 2x (20...16) solid, 2x (18...14) stranded."},{"question":"What compliance documentation is available for the 3RT1023-1BF40?","answer":"RoHS compliance with substance prohibition date 01.07.2006. The reference code per IEC 81346-2 is Q. Pollution degree 3 per IEC 60947-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1BF40","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 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}}