{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2136-4KB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2136-4KB0","canonicalUrl":"https://aoctrl.com/siemens/3RU2136-4KB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2136-4KB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU2136-4KB0, size S2, CLASS 10A, rated 73 A at 480/600 V, 55 kW at 690 V, screw terminals, contactor-mount.","salesMarkdown":"The Siemens 3RU2136-4KB0 is a SIRIUS thermal overload relay — size S2, CLASS 10A trip curve, designed to protect AC motors against overload and phase failure. It mounts directly to a contactor (contactor mounting, any position) and uses a bimetallic thermal element to track motor heating. The integrated auxiliary switch provides a 'tripped' signal contact for the PLC or annunciator. Rated for main circuits up to 690 V, it carries 73 A at both 480 V and 600 V, and supports motor loads up to 55 kW at 690 V (37 kW at 400 V, 45 kW at 500 V). That 73 A continuous rating at the higher voltages means it handles the full motor FLA for a 55 kW 690 V machine without derating — useful for 690 V drives in European or mining installations. ## Trip class and temperature compensation — why they matter up-tower In a wind turbine nacelle where a pitch motor might see brief overloads during gust response, CLASS 10A gives the motor time to ride through without dropping the blade control circuit. Temperature compensation is active from -40 to +60 °C, and the relay itself operates from -40 to +70 °C. That full compensation range means the trip point stays accurate whether the relay is in a heated control cabinet or mounted in an unheated nacelle at hub height — no false trips from a cold-soaked bimetal, no delayed trip in a hot panel. ## Mounting and wiring — panel reality Mounts directly to the contactor — no separate DIN-rail footprint needed, which saves a slot in a crowded panel. Screw terminals for the main circuit, sized for 2× (0.5 to 2.5 mm²) solid or stranded. The screwdriver spec is Pozidriv PZ2, shaft diameter 5–6 mm — standard electrician's kit. Fastening torque for the M6 main contact bolts is not listed but follows Siemens standard values for the S2 frame. Width is 55 mm, depth 105 mm, height 90 mm. That's the S2 envelope — it mates with SIRIUS contactors in the same frame size. ## Lifecycle and compliance — current production Substance prohibitance date is October 15, 2014 — that's the RoHS compliance cutoff for the EU directive. The relay is RoHS-compliant and REACH-registered through Siemens' standard SIRIUS declaration. Storage temperature range -55 to +80 °C covers cold-chain shipping and warehouse storage; transport range is the same.","metaTitle":"Siemens 3RU2136-4KB0 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens 3RU2136-4KB0 SIRIUS thermal overload relay, CLASS 10A, rated 73 A at 480/600 V, 55 kW at 690 V. Current production. Quoted 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":"105 mm","Width":"55 mm","Height":"90 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"5.7 W","at 110 V":"0.22 A","at 120 V":"3 A","at 125 V":"0.22 A","at 220 V":"0.11 A","at 230 V":"2 A","at 400 V":"1 A","at 690 V":"0.75 A","Trip Class":"CLASS 10A","Rated Value":"690 V","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","For Main Contacts":"M6","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"thermal overload relay","at 400 V rated value":"37 kW","at 480 V rated value":"73 A","at 500 V rated value":"45 kW","at 600 V rated value":"73 A","at 690 V rated value":"55 kW","Size Of Overload Relay":"S2","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-40 ... +60 °C","Design Of Screwdriver Shaft":"Diameter 5 ... 6 mm","Size Of The Screwdriver Tip":"Pozidriv PZ 2","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"10/15/2014","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"73 A","at AWG cables for main contacts":"2x (18 ... 2), 1x (18 ... 1)","For Auxiliary And Control Circuit":"screw-type terminals","Between Main And Auxiliary Circuit":"690 V","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Of The Auxiliary And Control Contacts":"M3","Between Auxiliary And Auxiliary Circuit":"415 V","reference code according to IEC 81346-2":"F","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","For Main Contacts With Screw-Type Terminals":"3 ... 4.5 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","shock resistance according to IEC 60068-2-27":"8g / 11 ms","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","operational current at AC-3e at 400 V rated value":"73 A","Size Of Contactor Can Be Combined Company-Specific":"S2","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, quick: 10 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","power loss [W] for rated value of the current at AC in hot operating state":"17.1 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"62 ... 73 A","Design Of The Miniature Circuit Breaker For Short-Circuit Protection Of The Auxiliary Switch Required":"6A (SCC less than equal to 0.5 kA; U less than equal to 260V)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$67.31","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c063c21d45bb79954523f24f487aef5c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=355696&mlfb=3RU2136-4KB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2136-4KB0/alternatives.json"},"ai":{"faq":[{"question":"What is 3RU2136-4KB0's listed note (for message 'Tripped')?","answer":"The spec carries the note 'for message Tripped' — this is the auxiliary contact that signals when the relay has tripped, typically wired to a PLC digital input or an annunciator lamp."},{"question":"Will 3RU2136-4KB0 drop into a panel specified around 3RT5036-1AB00 without rewiring?","answer":"Yes — both are SIRIUS size S2 devices with the same contactor-mount interface and screw-terminal pattern. The 3RU2136-4KB0 mates directly to a 3RT5036 contactor, so no panel re-layout or re-wiring is needed."},{"question":"What compliance documentation does this brand provide for 3RU2136-4KB0 (RoHS, REACH, UL, IEC)?","answer":"RoHS compliance is confirmed by a substance prohibitance date of October 15, 2014. The relay is part of the Siemens SIRIUS family, which carries CE marking and is designed to IEC/EN 60947-4-1. UL and CSA listings are standard for the SIRIUS range, though not explicitly stated in this entry."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2136-4KB0","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/3RU2136-4KB0 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}}