{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU5136-4GB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU5136-4GB1","canonicalUrl":"https://aoctrl.com/siemens/3RU5136-4GB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU5136-4GB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU5136-4GB1 thermal overload relay, 45 A rated current, adjustable 36–45 A, Trip Class 10, screw terminals, 55 mm wide.","salesMarkdown":"The Siemens 3RU5136-4GB1 is a SIRIUS thermal overload relay rated at 45 A operational current, adjustable from 36 to 45 A via the current-dependent overload release. The thermal bimetal design responds to actual motor heating, not just instantaneous current, so nuisance tripping on moderate overloads is kept to a minimum. This relay is paired with a contactor of frame size S2 (Siemens-specific sizing), installed stand-alone or directly coupled. The main circuit uses screw-type terminals accepting 2×(0.5–1.5 mm²) solid/stranded or 2×(0.75–2.5 mm²) finely stranded with ferrules, with a tightening torque of 3 to 5 N·m. Auxiliary and control circuits also use screw terminals, wired with 2×(0.5–1.5 mm²) or 2×(0.75–2.5 mm²). The 45 A rating and 36–45 A adjustment range determine which motor this relay protects: it covers motors with FLA between 36 and 45 A at 50/60 Hz. The 690 V rated operational voltage and 6 kV surge voltage resistance mean it is suitable for 400 VAC and 480 VAC systems with adequate clearance. The 9 W typical power loss — 15.6 W at rated current in hot operating state — matters for enclosure thermal budgeting; at 5.2 W per pole, a panel with multiple relays needs ventilation or derating above 40 °C. Mounting position is flexible: the relay can be installed with a vertical mounting surface, rotatable ±135° or tiltable ±45° to front and back. It requires 6 mm clearance to grounded parts at the side. For short-circuit protection of the auxiliary switch, use a gL/gG fuse rated 6 A or a quick-acting fuse rated 10 A. The part is rated for installation altitudes up to 2000 m above sea level. ## Integration notes The relay measures 55 mm wide by 105 mm high by 118 mm deep. Stand-alone installation means it mounts directly on the DIN rail or panel plate without a contactor base, though it is intended to couple with a SIRIUS S2 contactor. Screw terminals on top and bottom allow straightforward wiring: main conductors enter the top, exit the bottom. For auxiliary contacts, AWG 18–14 is handled by the screw terminals. Ambient operating temperature spans –20 to +70 °C; storage/transport from –55 to +80 °C. The relay withstands 8g shock for 10 ms per IEC 60068-2-27.","metaTitle":"Siemens 3RU5136-4GB1 Thermal Overload Relay, 45 A, Class 10","metaDescription":"Siemens SIRIUS 3RU5136-4GB1 thermal overload relay, rated 45 A, adjustable 36-45 A, Trip Class 10. Current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"118 mm","Width":"55 mm","Height":"105 mm","at 24 V":"1 A","Per Pole":"5.2 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"stand-alone installation","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":"9 W","Operating Voltage Rated Value":"690 V","Substance Prohibitance (Date)":"07/01/2006","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"45 A","for AWG cables for main contacts":"2x (18 ... 3), 1x (18 ... 1)","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"0 ... 100 %","Surge Voltage Resistance Rated Value":"6 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":"S2","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":"3 ... 5 N·m","insulation voltage with degree of pollution 3 at AC rated value":"690 V","power loss [W] for rated value of the current at AC in hot operating state":"15.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"36 ... 45 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621241&mlfb=3RU5136-4GB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU5136-4GB1/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 3RU5136-4GB1?","answer":"The 3RT5034-1BW40 is a contactor in the same SIRIUS S2 frame size, but it is a contactor, not an overload relay. For a direct overload relay substitute, the 3RU5136-4GB1 is the current part; no second-source is officially listed. If you need a different current range, the 3RU series offers other amp ratings in the same footprint."},{"question":"Will the 3RU5136-4GB1 fit a panel designed for a 3RT5034-1BW40?","answer":"The 3RU5136-4GB1 is designed to couple with a SIRIUS S2 contactor such as the 3RT5034-1BW40. It shares the same mounting footprint and screw-terminal arrangement, so it drops into the same panel without rewiring the main circuit. Verify auxiliary contact wiring separately."},{"question":"What compliance documentation is available for the 3RU5136-4GB1?","answer":"The relay carries RoHS compliance with substance prohibitance date of July 1, 2006. Standard documentation includes CE, UL, CSA, and REACH declarations. These are provided with the shipment upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU5136-4GB1","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/3RU5136-4GB1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}