{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-3BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-3BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-3BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-3BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1023-3BF40, S0 frame, 110 VDC coil, screw-type main terminals, spring-loaded auxiliary terminals, IP20 front / IP00 terminals.","salesMarkdown":"Rated for 4 kW at AC-2 duty on 400 V and 5.5 kW at 690 V, this contactor handles the inductive load of motors — pumps, conveyors, fans — where the AC-2 rating covers starting and running. The 110 V DC coil draws 5.4 W on closing and holding — same figure for both, which means no extra power is needed to keep it sealed. That simplifies the DC supply sizing in the panel. Main circuit terminals accept solid or stranded wire: 2x (0.25…2.5 mm²), 2x (1…2.5 mm²), 2x (2.5…6 mm²), or up to 2x 10 mm². AWG equivalents are 2x (16…12), 2x (14…10), and 1x 8. Auxiliary terminals take 2x (24…14) AWG. For type 2 coordination (no weld after fault), use a gL/gG fuse rated 25 A. For type 1 coordination (welding allowed), the fuse can be 63 A. This lets the panel designer choose the protection philosophy. Compliance documentation includes RoHS and REACH substance prohibitance dated July 1, 2006.","metaTitle":"Siemens 3RT1023-3BF40 SIRIUS Power Contactor, 110 VDC Coil,","metaDescription":"Siemens SIRIUS 3RT1023-3BF40 power contactor, 110 VDC coil, S0 frame, 4 kW at AC-2 400 V, 5.5 kW at 690 V. Active production. Screw main terminals, spring-loaded aux. DIN rail moun","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 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":"spring-loaded 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 (24 ... 14)","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 (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","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=217831&mlfb=3RT1023-3BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-3BF40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for the 3RT1023-3BF40?","answer":"The 3RT1015-1BB42 is a peer in the same SIRIUS family, but it uses a different coil voltage and frame size. The 3RT1023-3BF40 carries a 110 V DC coil in an S0 frame; the 3RT1015-1BB42 is a smaller S00 frame with a 24 V AC coil. It will not drop into the same panel without rewiring and checking the mounting rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-3BF40","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/3RT1023-3BF40 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}}