{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5146-4LB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5146-4LB0","canonicalUrl":"https://aoctrl.com/siemens/3RU5146-4LB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5146-4LB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU5146-4LB0 thermal overload relay, 90 A rated operational current, adjustable 70–90 A, Trip Class 10, Size S3, screw-type terminals, contactor mounting.","salesMarkdown":"## Motor protection envelope — 90 A, adjustable 70–90 A, Class 10 The Siemens 3RU5146-4LB0 is a SIRIUS thermal overload relay rated 90 A operational current, with an adjustable current response range of 70–90 A. This relay is designed for Size S3 contactor combination, mounting directly onto the contactor without occupying DIN rail space. ## Panel fit and environmental tolerance Dimensions are 140 mm depth, 70 mm width, 120 mm height — the width is the critical panel-spacing dimension. Siemens requires 6 mm clearance to grounded parts on the side. The relay operates from -20 to +70 °C and 0–100% relative humidity, and withstands 8g shock for 10 ms per IEC 60068-2-27, so it holds up in high-vibration MCCs. Mounting position is flexible: vertical surface with ±135° rotation or ±45° tilt front/back. Installation altitude is limited to 2000 m above sea level without derating. ## Sourcing and lifecycle — active production, quoted to order The relay carries a rated operational voltage of 1000 V at 50–60 Hz, surge voltage resistance 8 kV, and insulation voltage 1000 V with pollution degree 3. Typical power loss is 16.5 W total, rising to 21 W in hot operating state at rated current.","metaTitle":"Siemens 3RU5146-4LB0 SIRIUS Overload Relay, 90 A, Class 10","metaDescription":"Siemens 3RU5146-4LB0 SIRIUS thermal overload relay, 90 A rated current, adjustable 70–90 A, Trip Class 10, Size S3, contactor mounting.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Width":"70 mm","title":"3RU5146-4LB0","Height":"120 mm","at 24 V":"1 A","Per Pole":"7 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 70...90 A size S3, class 10 for motor protection for mounting onto contactors main circuit: screw terminal AUX. circuit: screw terminal manual automatic reset","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","Mounting Position":"with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Thermal overload relay","For Main Current Circuit":"screw-type terminals","power loss [W] total typical":"16.5 W","Operating Voltage Rated Value":"1 000 V","Substance Prohibitance (Date)":"07/01/2006","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"90 A","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"0 ... 100 %","Surge Voltage Resistance Rated Value":"8 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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","shock resistance according to IEC 60068-2-27":"8g / 10 ms","Required Spacing For Grounded Parts At The Side":"6 mm","Size Of Contactor Can Be Combined Company-Specific":"S3","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 gL/gG: 6 A, quick: 10 A","Tightening Torque For Main Contacts With Screw-Type Terminals":"4 ... 6 N·m","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","power loss [W] for rated value of the current at AC in hot operating state":"21 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"70 ... 90 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ad4182b3ba9baa52854185f80e07b9a5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621455&mlfb=3RU5146-4LB0"},"ai":{"faq":[{"question":"What is 3RU5146-4LB0 used for?","answer":"It is a thermal overload relay for motor protection, rated 90 A with adjustable trip current 70–90 A and Trip Class 10. It mounts directly onto a Size S3 contactor in the Siemens SIRIUS family, protecting the motor from overcurrent and phase loss."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5146-4LB0","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/3RU5146-4LB0 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}}