{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1046-1BB44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1046-1BB44","canonicalUrl":"https://aoctrl.com/siemens/3RT1046-1BB44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1046-1BB44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 24 VDC coil, screw terminals, 45 kW at 400 V AC-2, 80 A AC-4, snap-on mounting.","salesMarkdown":"It carries a 24 VDC coil, which means you pull control power from a standard 24 VDC supply — no separate AC coil transformer needed. The screw-type terminals on the main circuit accept stranded conductors up to 2x 50 mm², sized for the motor feeder cable on a 45 kW load at 400 V AC-2 duty. Rated 45 kW at 400 V AC-2 (slip-ring motor starting) and 80 A at 400 V AC-4 (plugging/reversing/inching duty), this contactor handles the high-stress switching cycles that wear out a general-purpose contactor fast. The mechanical life of 10,000,000 operations means it outlasts the panel's service life under normal cycling. Snap-on mounting onto 35 mm or 75 mm DIN rail. The S3 footprint is 70 mm wide, 146 mm tall, and 201 mm deep. Side-by-side mounting is permitted. IP20 on the front with the cover or box terminal installed; the terminal area itself is IP00. That's standard for enclosed panel mounting — the enclosure door provides the environmental seal. ## Switching frequency and thermal limits Maximum switching frequency varies by duty: 900 cycles/hour for AC-1 resistive loads, 850 for AC-3 motor starting, 350 for AC-2, and 250 for AC-4 plugging duty. That's the thermal limit of the contactor — exceeding it will overheat the coil or arc chamber. The built-in auxiliary contacts (one NO, one NC typical for this frame) are rated for switching at various control voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V. These are the DC switching limits for the auxiliary circuit — use them for PLC inputs or relay coils, not motor loads. RoHS compliance date is May 1, 2012, meaning it meets the EU restriction on hazardous substances for equipment placed on the market after that date. No UL or CSA listing is explicitly stated in the spec record, but as a Siemens SIRIUS component it typically carries those marks — verify the specific nameplate for your jurisdiction.","metaTitle":"Siemens SIRIUS 3RT1046-1BB44 Power Contactor, S3, 24 VDC Coi","metaDescription":"Siemens SIRIUS 3RT1046-1BB44 power contactor, size S3, 24 VDC coil. Rated 45 kW at 400 V AC-2, 80 A AC-4. Screw terminals, snap-on DIN rail mount. Current production. Sourced to or","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"201 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"70 mm","at DC":"14 ... 20 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"24 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":"screw-type 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 (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","reference code according to IEC 81346-2":"Q","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)","Thermal Short-Time Current Limited To 10 S":"760 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 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":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","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=507461&mlfb=3RT1046-1BB44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1046-1BB44/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the screw terminal accept?","answer":"Main circuit terminals accept stranded conductors from 2x 10 mm² up to 2x 50 mm². Solid wire sizes range from 2x 0.5 mm² to 2x 4 mm² for the auxiliary terminals. The auxiliary terminals also accept 2x 0.75 to 2.5 mm² solid or 2x 2.5 to 16 mm² stranded."},{"question":"What is the physical size of this contactor?","answer":"Width 70 mm, height 146 mm, depth 201 mm. It snaps onto 35 mm or 75 mm DIN rail and can be mounted side-by-side."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1046-1BB44","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/3RT1046-1BB44 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}}