{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3046-2UD0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3046-2UD0","canonicalUrl":"https://aoctrl.com/siemens/3RB3046-2UD0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3046-2UD0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB3046-2UD0, Size S3, CLASS 20E, rated thermal current 50 A, for contactor mounting.","salesMarkdown":"The Siemens 3RB3046-2UD0 is a SIRIUS solid-state overload relay, Size S3, designed to protect motors against overload and phase failure. It mounts directly onto a contactor, saving panel space and simplifying wiring. Rated for a CLASS 20E trip curve, it allows motors with longer starting times — like conveyors or crushers — to start without nuisance tripping, while still providing protection during running overloads. The CLASS 20E trip class means the relay will allow the motor to draw up to 600% of its full-load current for 20 seconds before tripping. Its auxiliary switch is integrated and rated for switching at various control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.55 A at 60 V. These ratings cover the common control supply voltages found in most panels, so you can wire the trip signal directly into a PLC input or a holding circuit without an interposing relay. That means the trip curve stays accurate even if the relay is mounted near a warm motor starter or inside a non-air-conditioned enclosure. It withstands shock of 8g for 11 ms and vibration of 1-6 Hz at 15 mm amplitude, 6-500 Hz at 20 m/s², for 10 cycles. This is enough for most industrial environments, including conveyor lines and machine tools. This relay is designed for direct contactor mounting — it snaps onto the contactor's own terminals, eliminating separate DIN-rail space and the wiring between the contactor and the overload. The fastening method is listed as \"contactor mounting\" and it accepts any mounting position. The control circuit terminals accept 2x (0.25 to 1.5 mm²) solid or stranded. Use a Pozidriv PZ2 screwdriver with a 5-6 mm diameter shaft. Physical dimensions are 70 mm wide, 106 mm high, and 124 mm deep. The S3 size is the largest frame in the SIRIUS 3RB3 family, sized for the 50 A thermal current rating. The substance prohibitance date is listed as 03/01/2017, which aligns with RoHS compliance requirements. No additional compliance documentation (UL, CSA, CE) is listed in the spec record, but as a Siemens SIRIUS component it typically carries CE marking for the European market.","metaTitle":"Siemens 3RB3046-2UD0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens 3RB3046-2UD0 SIRIUS solid-state overload relay, CLASS 20E, 50 A thermal current. Current 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":"3RB3046-2UD0","Height":"106 mm","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"0.3 W","Stranded":"2x 16 mm²","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 Contactor mounting Main circuit: Screw 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":"Contactor mounting","Shock Resistance":"8g / 11 ms","For Main Contacts":"M6","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":"screw-type terminals","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)","For Main Contacts With Screw-Type Terminals":"4.5 ... 6 N·m","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":"0.9 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/91727cde229b3be842e1788963a9103d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629739&mlfb=3RB3046-2UD0"},"ai":{"faq":[{"question":"What does the note 'for message tripped' mean on this relay?","answer":"The note indicates that the auxiliary contact position labeled 97/98 is the 'tripped' signaling contact. When the relay trips on overload, this contact changes state to send a message to the control system."},{"question":"What are the physical dimensions of the 3RB3046-2UD0?","answer":"The relay measures 70 mm wide, 106 mm high, and 124 mm deep. It is Size S3 in the SIRIUS overload relay family."},{"question":"What compliance documentation is available for this part?","answer":"The substance prohibitance date of 03/01/2017 indicates RoHS compliance. As a Siemens SIRIUS product, it typically carries CE marking for the European market, though specific UL/CSA listings are not detailed in the available spec record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3046-2UD0","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/3RB3046-2UD0 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}}