{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1023-1BF44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1023-1BF44","canonicalUrl":"https://aoctrl.com/siemens/3RT1023-1BF44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BF44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1023-1BF44, S0 frame, 110 VDC coil, screw terminals, 4.5 kW at 400 V AC-3, IP20 front.","salesMarkdown":"## SIRIUS 3RT1023-1BF44 — 110 VDC Coil, S0 Frame Power Contactor Its 110 VDC coil draws 5.4 W closing and holding, so the control transformer or DC supply must be sized for that continuous draw — no inrush spike beyond the holding power, which simplifies the DC rail budget. Rated for AC-3 duty at 4.5 kW on 400 V three-phase and 5.5 kW at 690 V, this contactor handles standard induction motors up to those power levels. For resistive loads (AC-12), the maximum operating current is 10 A. Front protection is IP20; the terminals themselves are IP00, so the panel enclosure provides the environmental seal. ## Motor Duty and Coordination For AC-3 motor starting at 400 V, this contactor delivers 4.5 kW — that is the rating that governs the real motor load, not the AC-1 resistive figure. The AC-2 rating of 4 kW at 400 V applies to slip-ring motors or wound-rotor applications where the load current is lower but switching frequency may be higher. Short-circuit coordination: with type 2 coordination, a gL/gG fuse rated 25 A protects the contactor; type 1 coordination allows a 63 A fuse. Main current circuit terminals are screw-type, accepting 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max. 2x 10 mm² stranded. Auxiliary contact terminals accept 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²), or max. 2x (0.75 to 4 mm²). AWG equivalents: main contacts 2x (16 to 12), 2x (14 to 10), 1x 8; auxiliary contacts 2x (20 to 16), 2x (18 to 14), max. 2x (18 to 12).","metaTitle":"Siemens 3RT1023-1BF44 SIRIUS Power Contactor, 110 VDC Coil,","metaDescription":"Siemens 3RT1023-1BF44 SIRIUS power contactor, 110 VDC coil, S0 frame, 4.5 kW at 400 V AC-3. Current lifecycle. Available to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"150 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":"2","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=239558&mlfb=3RT1023-1BF44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1023-1BF44/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1023-1BF44","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/3RT1023-1BF44 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}}