{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1046-3BM40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1046-3BM40","canonicalUrl":"https://aoctrl.com/siemens/3RT1046-3BM40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1046-3BM40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, S3 frame, screw-type terminals, 55 kW at 500 V AC-3, 80 A at 400 V AC-4, snap-on and screw mounting onto 35 mm and 75 mm rail.","salesMarkdown":"The Siemens 3RT1046-3BM40 is a SIRIUS S3-frame power contactor rated for motor switching up to 55 kW at 500 V in AC-3 duty and 25.4 kW at 690 V — that's the standard induction-motor start/run curve, so it handles most 50–75 kW-class pumps, fans, and compressors on common European 400 V networks with headroom. For reversing or inching applications, the AC-4 rating of 80 A at 400 V governs the contactor's ability to break stalled-rotor current repeatedly; that's the number to use when sizing for jogging or plugging duty, not the AC-3 figure. The S3 frame mounts on 35 mm or 75 mm standard DIN rail via the integrated snap-on foot, or can be screw-fastened to a backplate — the dual fastening method lets panel builders standardise on one contactor across both DIN-rail and bolted layouts. IP20 on the front with the cover or box terminal fitted means the contactor is touch-safe in a closed panel; the terminal body itself is IP00, so live parts are exposed until the enclosure door is shut — standard for panel-mount contactors. ## Lifecycle and compliance — current production, documented Substance prohibitance date of 05/01/2012 aligns with the EU RoHS recast (2011/65/EU) compliance horizon — the contactor meets RoHS and REACH material restrictions for European BOMs. ## Termination and wiring — screw terminals, dual-wire capacity Main current circuit uses screw-type terminals; the solid conductor range accepts 2x (0.25 to 2.5 mm²) for control wiring and 2x (10 to 50 mm²) for stranded power cables — the dual-wire capacity per clamp simplifies daisy-chaining or paralleling feeds without additional terminal blocks. The intermediate stranded range of 2x (2.5 to 16 mm²) covers the most common panel-building wire sizes for S3-frame motor circuits. ## Switching performance — mechanical and electrical endurance Maximum switching frequency varies by duty: 900 operations per hour at AC-1 (resistive loads), 850 at AC-3 (motor start/run), and 250 at AC-4 (reversing/inching) — the AC-4 limit reflects the higher thermal stress of breaking locked-rotor current.","metaTitle":"Siemens 3RT1046-3BM40 SIRIUS Power Contactor, S3, 55 kW at 5","metaDescription":"Siemens SIRIUS 3RT1046-3BM40 power contactor, S3 frame, 55 kW at 500 V AC-3, 80 A at 400 V AC-4. Screw terminals, snap-on DIN rail. Current lifecycle stage. Sourced to order agains","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":"220 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=328951&mlfb=3RT1046-3BM40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1046-3BM40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1046-3BM40 and get current pricing?","answer":"The 3RT1046-3BM40 is sourced and quoted to order against an RFQ through independent distribution channels; availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional alternative to 3RT1046-3BM40?","answer":"The 3RT5046-1BM40 is a functionally similar SIRIUS S3-frame contactor with comparable AC-3 power ratings, but it uses spring-type terminals instead of screw terminals — verify terminal preference before substituting."},{"question":"Will 3RT1046-3BM40 drop into a panel specified around 3RT1044-1FB46 without rewiring?","answer":"The 3RT1046-3BM40 is an S3-frame contactor while the 3RT1044-1FB46 is an S2-frame; the S3 has a larger footprint (70 mm wide vs the S2's narrower body), so it will not fit the same DIN-rail space or terminal layout without panel rework."},{"question":"What compliance documentation does Siemens provide for 3RT1046-3BM40?","answer":"The contactor carries RoHS/REACH compliance with a substance prohibitance date of 05/01/2012, and is rated for pollution degree 3 per IEC 60947-1 — standard CE/UKCA declarations are available from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1046-3BM40","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/3RT1046-3BM40 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}}