{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5146-4DB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5146-4DB0","canonicalUrl":"https://aoctrl.com/siemens/3RU5146-4DB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5146-4DB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU5146-4DB0, 3-pole, adjustable 18-25 A, CLASS 10 trip, screw terminals, 70 mm width, for S3 contactor mounting.","salesMarkdown":"## SIRIUS 3RU5146-4DB0 — Thermal Overload Relay, 18–25 A, CLASS 10 The Siemens 3RU5146-4DB0 is a SIRIUS thermal overload relay rated for a 25 A operational current, adjustable from 18 to 25 A via the current-dependent release. This is a current-production part (lifecycle stage: current). Mounts directly onto a SIRIUS S3 contactor — no separate DIN-rail footprint needed, which saves a slot in a crowded panel. The 70 mm width matches the S3 contactor frame, so the assembly stays within the same envelope. Fastening method is contactor mounting, with the relay snapping onto the contactor's built-in rail. Side spacing requirement is 6 mm to grounded parts — plan for that gap when laying out adjacent components. Main circuit terminals accept 2× (0.5 to 1.5 mm²) solid/stranded or 2× (0.75 to 2.5 mm²) — also 2× (10 to 1/0 AWG) or 1× (10 to 2/0 AWG). Auxiliary contacts take 2× (20 to 16 AWG) or 2× (18 to 14 AWG). Tightening torque for main contacts is 4 to 6 N·m. For short-circuit protection of the auxiliary switch, use a gL/gG fuse rated 6 A or a quick-acting 10 A fuse.","metaTitle":"Siemens 3RU5146-4DB0 SIRIUS Thermal Overload Relay, 18-25 A,","metaDescription":"Siemens 3RU5146-4DB0 SIRIUS thermal overload relay, adjustable 18-25 A, CLASS 10 trip, 3-pole, screw terminals, 70 mm wide. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Width":"70 mm","title":"3RU5146-4DB0","Height":"120 mm","at 24 V":"1 A","Per Pole":"4 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 18...25 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":"25 A","for 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","for 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":"12 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"18 ... 25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/040ab5cd072e2855379e10918e6633b2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621245&mlfb=3RU5146-4DB0"},"ai":{"faq":[{"question":"What is the adjustable current range on the 3RU5146-4DB0?","answer":"The current-dependent overload release is adjustable from 18 to 25 A. The rated operational current is 25 A."},{"question":"What trip class is the 3RU5146-4DB0?","answer":"Trip class is CLASS 10, meaning the relay will trip within 10 seconds at 7.2× the set current — suitable for standard motor protection."},{"question":"What contactor does the 3RU5146-4DB0 mount to?","answer":"It mounts directly onto a SIRIUS S3 contactor. The fastening method is contactor mounting — no separate DIN-rail base required."},{"question":"Where can I buy the 3RU5146-4DB0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. 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/3RU5146-4DB0","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/3RU5146-4DB0 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}}