{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3046-2UX1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3046-2UX1","canonicalUrl":"https://aoctrl.com/siemens/3RB3046-2UX1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3046-2UX1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB3046-2UX1, Class 20E, 50 A thermal current, S3 size, electronic release, integrated auxiliary switch.","salesMarkdown":"The Siemens 3RB3046-2UX1 is a SIRIUS solid-state overload relay, size S3, with an electronic overload release and an integrated auxiliary switch. It carries a Class 20E trip curve and a thermal current rating of 50 A, sized for straight-through current transformers in the main circuit. The relay provides a dedicated signaling contact for a \"tripped\" message — that's the Note on the nameplate: the 97/98 auxiliary position reports the overload state, not just the relay's energized status. Class 20E means the relay allows a 20-second trip delay at 7.2× current setting — standard for medium-inertia loads like fans and screw compressors where nuisance tripping on startup is the real risk. The 50 A thermal current (Ith) is the continuous carry rating through the transformer window; the actual motor FLA setting will be lower, dialed in on the relay's adjustment range. The electronic release gives temperature compensation across -25 to +60 °C ambient, so the trip point stays stable whether the panel is in a conditioned room or a hot plant floor. The auxiliary switch is integrated, so there's no separate add-on block to order; the 97/98 contact handles the tripped signal. Vibration resistance is spec'd at 1–6 Hz, 15 mm amplitude and 6–500 Hz, 20 m/s² over 10 cycles — enough for most industrial machinery but worth checking if the relay is mounted directly on a high-vibration pump skid. ## Substance compliance The relay carries a substance prohibition date of 03/01/2017, aligning with RoHS and REACH compliance milestones for the SIRIUS portfolio. No separate UL or IEC certification numbers appear in the spec record, but the SIRIUS line is typically UL-listed and IEC 60947-rated; verify the specific marking on the unit if a project requires a hard-copy cert.","metaTitle":"Siemens 3RB3046-2UX1 SIRIUS Solid-State Overload Relay, Clas","metaDescription":"Siemens 3RB3046-2UX1 SIRIUS solid-state overload relay, Class 20E, 50 A thermal current, S3 size. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"tripped\"","Depth":"124 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"70 mm","title":"3RB3046-2UX1","Height":"106 mm","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"0.07 W","at 110 V":"0.3 A","at 120 V":"4 A","at 125 V":"0.3 A","at 220 V":"0.11 A","at 230 V":"3 A","Trip Class":"CLASS 20E","Rated Value":"1 000 V","description":"Overload relay 12.5...50 A Electronic For motor protection Size S3, Class 20E Stand-alone installation Main circuit: Straight-through transformer Auxiliary circuit: Spring-type terminal Manual-Automatic-Reset","During Storage":"-40 ... +80 °C","Thermal Current":"50 A","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"stand-alone installation","Shock Resistance":"8g / 11 ms","Mounting Position":"any","Solid Or Stranded":"2x (0,25 ... 1,5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"solid-state overload relay","Vibration Resistance":"1-6 Hz, 15 mm; 6-500 Hz, 20 m/s²; 10 cycles","at 480 V rated value":"50 A","at 600 V rated value":"50 A","Size Of Overload Relay":"S3","For Main Current Circuit":"straight-through transformers","Temperature Compensation":"-25 ... +60 °C","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Screwdriver Tip":"Pozidriv PZ 2","according to IEC 60068-2-27":"15g / 11 ms; Signaling contact 97 / 98 in position \"Tripped\": 8g / 11 ms","at AC-3e rated value maximum":"1 000 V","Substance Prohibitance (Date)":"03/01/2017","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"electronic","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"50 A","for AC motors at 500 V at 50 Hz":"11 ... 30 kW","for AC motors at 690 V at 50 Hz":"11 ... 45 kW","For Auxiliary And Control Circuit":"spring-loaded terminals","Between Main And Auxiliary Circuit":"690 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 200 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 200 A","for 3-phase motors at 400 V at 50 Hz":"7.5 ... 22 kW","for AWG cables for auxiliary contacts":"2x (24 ... 16)","Between Auxiliary And Auxiliary Circuit":"300 V","due to burst according to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Finely Stranded Without Core End Processing":"2x (0.25 ... 1.5 mm²)","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","operational current at AC-3e at 400 V rated value":"50 A","Size Of Contactor Can Be Combined Company-Specific":"S3","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Type Of Voltage Supply Via Input/Output Link Master":"No","contact rating of auxiliary contacts according to UL":"B600 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 6 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","power loss [W] for rated value of the current at AC in hot operating state":"0.2 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"12.5 ... 50 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a3a2af4865d9d2f4443342f8162df783.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629741&mlfb=3RB3046-2UX1"},"ai":{"faq":[{"question":"What does the Note \"for message tripped\" mean on this relay?","answer":"The Note indicates the integrated auxiliary switch (terminals 97/98) is dedicated to signaling a tripped condition, not the relay's power status. When the overload relay trips, that contact changes state to send a \"tripped\" message to the PLC or annunciator."},{"question":"What is the depth of the 3RB3046-2UX1?","answer":"The depth is 124 mm, with a width of 70 mm and height of 106 mm — S3 size footprint."},{"question":"Where can I buy the 3RB3046-2UX1?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3046-2UX1","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/3RB3046-2UX1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}