{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5146-4HB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5146-4HB0","canonicalUrl":"https://aoctrl.com/siemens/3RU5146-4HB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5146-4HB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3-pole, screw terminals, adjustable current response 36-50 A, Trip Class 10, contactor-mount size S3, 140 x 70 x 120 mm.","salesMarkdown":"Adjustable from 36 to 50 A, it sits on top of an S3-size contactor and shares the same DIN-rail footprint. Rated operational current is 50 A at up to 1000 V on a 50/60 Hz line. That 50 A is the thermal continuous rating — the relay can carry that current indefinitely without tripping. The adjustable range (36-50 A) lets you dial in the motor FLA without swapping the relay. Power loss at rated current in hot operation is 15.3 W, total typical 16.5 W — that heat has to escape, so the 6 mm side spacing to grounded parts is not optional; stack them tighter and the ambient inside the enclosure rises, shifting the trip curve. Surge voltage resistance is 8 kV — that's the impulse withstand for the auxiliary contacts, not the main circuit. The main circuit insulation voltage is 1000 V at pollution degree 3, which covers most industrial panels up to 690 V line-to-line. Shock resistance per IEC 60068-2-27 is 8g for 10 ms — fine for a contactor-mounted relay on a panel door, but not for direct machine-mount without damping. Fastening method is contactor mounting — it clips directly onto the S3 contactor, no DIN rail needed for the relay itself. Main circuit terminals are screw-type, top and bottom, accepting 2×(0.5…1.5 mm²) solid/stranded or 2×(0.75…2.5 mm²), or AWG 2×(10…1/0) and 1×(10…2/0). Torque spec is 4-6 N·m — don't guess it; under-torque gives a hot joint that fools the bimetallic strip. Auxiliary and control circuits also use screw terminals, accepting 2×(20…16) or 2×(18…14) AWG. Relative humidity during operation can go 0 to 100 % — no condensation limit stated, but with the bimetallic design, condensation on the terminals is the real concern, not the strip. Installation altitude max is 2000 m; above that, derate the current or the dielectric strength drops. Substance prohibition date per RoHS-like compliance is 07/01/2006 — the part is RoHS-compliant as of that date.","metaTitle":"Siemens 3RU5146-4HB0 SIRIUS Thermal Overload Relay, 36-50 A,","metaDescription":"Siemens 3RU5146-4HB0 SIRIUS thermal overload relay, adjustable 36-50 A, Trip Class 10, 3-pole, contactor-mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Width":"70 mm","title":"3RU5146-4HB0","Height":"120 mm","at 24 V":"1 A","Per Pole":"5.1 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 36...50 A size S2, 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":"50 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":"15.3 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"36 ... 50 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/68e6e6342244ad623e1a5bd9cc873ede.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621248&mlfb=3RU5146-4HB0"},"ai":{"faq":[{"question":"What is the adjustable current range of 3RU5146-4HB0?","answer":"The adjustable current response value is 36 to 50 A."},{"question":"What trip class is this overload relay?","answer":"Trip Class 10 — opens within 10 seconds at 7.2× the set current."},{"question":"Where can I buy 3RU5146-4HB0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5146-4HB0","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/3RU5146-4HB0 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}}