{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1046-3BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1046-3BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT1046-3BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1046-3BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1046-3BF40, screw-type terminals, 55 kW at 500 V, 80 A AC-4 at 400 V, snap-on mounting for 35/75 mm rail.","salesMarkdown":"## SIRIUS S3 power contactor — what it handles and where it fits The Siemens SIRIUS 3RT1046-3BF40 is a size S3 power contactor rated for motor switching up to 55 kW at 500 V in AC-3 duty and 80 A in AC-4 at 400 V for reversing or inching applications. The front carries IP20 protection with a cover or box terminal; the main-circuit terminals themselves are IP00 — fine inside an enclosure, not for open-panel washdown. AC-3 at 400 V: 45 kW — that's the standard motor-switching rating for a 4-pole induction motor on a 400 V line, so it covers most 45 kW pumps, fans, and compressors in European-voltage plants. At 690 V the motor rating drops to 25.4 kW (AC-3), which is typical for high-voltage low-current loads. ## Terminals and wiring Main-circuit terminals are screw-type, accepting 2x solid conductors from 0.25 to 2.5 mm² on the control side and 2x stranded from 10 to 50 mm² on the power side. The auxiliary/coil terminals also take 2x solid 0.25–2.5 mm². That range covers standard panel wire up to 50 mm² for the main feed — no need for pin terminals or bootlace ferrules if you're using stranded.","metaTitle":"3RT1046-3BF40 SIRIUS S3 Power Contactor, 55 kW at 500 V, 80","metaDescription":"Siemens SIRIUS 3RT1046-3BF40 power contactor, size S3. 55 kW at 500 V, 80 A AC-4 at 400 V. Screw terminals, snap-on 35/75 mm rail. RoHS compliant. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"70 mm","at DC":"14 ... 20 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"110 V","On The Front":"IP20; IP20 on the front with cover / box terminal","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"900 1/h","at AC-2 maximum":"350 1/h","at AC-3 maximum":"850 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail","Full-Scale Value":"1.1","Size Of Contactor":"S3","Solid Or Stranded":"2x (2.5 ... 16 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":"55 kW","at 690 V rated value":"25.4 kW","Side-By-Side Mounting":"Yes","at 1000 V rated value":"37 W","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"45 kW","at AC-4 at 400 V rated value":"80 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"50 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"38 kW","at 690 V at 60 °C rated value":"114 kW","at 1000 V at 60 °C rated value":"98 W","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 160 A","closing power of magnet coil at DC":"15 W","holding power of magnet coil at DC":"15 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 250 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","reference code according to IEC 81346-2":"Q","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)","Thermal Short-Time Current Limited To 10 S":"760 A","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","contact rating of auxiliary contacts according to UL":"A600 / Q600","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=112058&mlfb=3RT1046-3BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1046-3BF40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1046-3BF40 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for your quantity."},{"question":"What is the closest functional second-source to 3RT1046-3BF40?","answer":"The 3RT1044-1FB46 is a smaller-frame SIRIUS contactor (size S2 vs S3) with a lower AC-3 rating. It will not drop into the same panel footprint without rewiring — the S3 has a 70 mm width vs S2's narrower body, and the terminal ranges differ. For a direct swap, stay within the S3 frame family."},{"question":"What is the depth of 3RT1046-3BF40?","answer":"The depth is 152 mm. That's the dimension from the mounting rail to the furthest front projection — important for enclosure depth planning when using a cover or box terminal."},{"question":"What solid conductor size does the control terminal accept?","answer":"The control/auxiliary terminals accept 2x solid conductors from 0.25 to 2.5 mm². For the main circuit, the screw terminals accept 2x stranded from 10 to 50 mm²."},{"question":"What compliance documentation does Siemens provide for 3RT1046-3BF40?","answer":"The part carries a substance prohibition date of 05/01/2012, confirming RoHS compliance per EU Directive 2011/65/EU. Standard Siemens SIRIUS documentation includes the declaration of conformity and CE marking for low-voltage directive compliance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1046-3BF40","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/3RT1046-3BF40 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}}