{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3046-2UB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3046-2UB0","canonicalUrl":"https://aoctrl.com/siemens/3RB3046-2UB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3046-2UB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB3046-2UB0 solid-state overload relay, CLASS 20E, 50 A thermal current, S3 size, screw terminals, contactor-mount.","salesMarkdown":"## What this SIRIUS solid-state overload relay does The Siemens 3RB3046-2UB0 is a SIRIUS solid-state overload relay — it protects motors against overload and phase loss by monitoring the motor current and tripping the contactor when the thermal model reaches the trip threshold. The trip class is CLASS 20E, meaning it allows a 20-second cold start at 7.2× rated current before tripping, which suits standard induction motors driving pumps, fans, and conveyors. The relay mounts directly to the contactor (fastening method: contactor mounting) and is sized S3, the standard frame for this current range in the SIRIUS family. ## Auxiliary contact ratings and wiring The integrated auxiliary switch provides a signal contact for the 'tripped' message. The contact is rated for AC-3e duty up to 1000 V. The auxiliary contact terminals take the same range. The screwdriver tip needed is Pozidriv PZ2 with a shaft diameter of 5–6 mm. ## Environmental limits and mounting Temperature compensation is active across the full operating range, so the trip curve stays accurate regardless of ambient temperature swings in the panel. Vibration resistance is 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s² for 10 cycles. Shock resistance is 8g for 11 ms on the main contact, and 15g for 11 ms per IEC 60068-2-27 on the signaling contact in the 'tripped' position. Dimensions are 70 mm wide, 106 mm high, 124 mm deep — the S3 footprint fits standard SIRIUS contactor assemblies on DIN rail or mounting plate.","metaTitle":"Siemens 3RB3046-2UB0 SIRIUS solid-state overload relay","metaDescription":"Siemens 3RB3046-2UB0 SIRIUS solid-state overload relay, CLASS 20E, 50 A thermal current, S3 size. 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":"1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²)","Width":"70 mm","title":"3RB3046-2UB0","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: Screw 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":"1x (0,5 ... 4 mm²), 2x (0,5 ... 2,5 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":"screw-type 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","Of The Auxiliary And Control Contacts":"M3","for AWG cables for auxiliary contacts":"2x (20 ... 14)","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":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","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","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","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/7356570c6a053ac922ccc47da71876ca.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629738&mlfb=3RB3046-2UB0"},"ai":{"faq":[{"question":"What does the 'tripped' message contact on the 3RB3046-2UB0 switch?","answer":"The integrated auxiliary switch provides a signal contact for the 'tripped' message. It switches up to 2 A at 24 V, 4 A at 120 V, or 3 A at 230 V, with lower ratings at intermediate voltages."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3046-2UB0","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/3RB3046-2UB0 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}}