{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2136-4KB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2136-4KB1","canonicalUrl":"https://aoctrl.com/siemens/3RU2136-4KB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2136-4KB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, Size S2, CLASS 10A, 690 V rated value, screw-type terminals, for main current circuit.","salesMarkdown":"That's fast enough for most standard induction motor starts, but not so fast that it nuisance-trips on a normal acceleration curve. The relay is rated for a maximum insulation voltage of 690 V, and it can handle motor loads up to 55 kW at 690 V or 37 kW at 400 V. The integrated auxiliary switch signals a tripped condition — the note on the part says \"for message 'Tripped'\" — so the PLC knows exactly why the motor stopped. ## Mounting and wiring in the panel This relay mounts standalone — no DIN rail adapter required, just screw it down. The Size S2 footprint is 105 mm tall, 55 mm wide, and 117 mm deep, so it fits in a standard motor starter cubby. Main circuit connections use screw-type terminals (M6 bolts) and accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded wire. The screwdriver shaft needs to be 5–6 mm diameter with a Pozidriv PZ2 tip — keep that in the van. Temperature compensation is active from -40 °C to +60 °C, so the trip curve stays accurate across the operating range. ## Auxiliary contact switching capacity The integrated auxiliary switch can handle a range of control voltages. At 24 V it switches 2 A; at 120 V it handles 3 A; at 230 V it's rated for 2 A; and at 400 V it drops to 1 A. For DC control circuits, it manages 0.3 A at 60 V and 0.22 A at 110 V or 125 V. That covers most PLC input and relay coil loads you'd find in a standard motor control center. The substance prohibition date is October 15, 2014, which aligns with RoHS compliance requirements. The relay uses a thermal bimetallic overload release — no electronics to fail, just a straightforward mechanical trip that resets manually or automatically depending on the application.","metaTitle":"Siemens 3RU2136-4KB1 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens 3RU2136-4KB1 SIRIUS thermal overload relay, Size S2, CLASS 10A trip, 690V rated insulation voltage. Current production. Available to order. Quoted on request.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"Tripped\"","Depth":"117 mm","Width":"55 mm","Height":"105 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":"stand-alone installation","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","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":null,"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=277435&mlfb=3RU2136-4KB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2136-4KB1/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RU2136-4KB1 rated for in terms of motor power?","answer":"At 400 V it's rated for 37 kW; at 500 V for 45 kW; and at 690 V for 55 kW. The rated insulation voltage is 690 V, and the AC-3e rated voltage maximum is also 690 V."},{"question":"What does the note 'for message Tripped' mean on this part?","answer":"It means the integrated auxiliary switch is wired to send a signal to the control system — typically a PLC input — indicating that the overload relay has tripped. It's not just a visual flag; it's a dry contact that tells the automation system the motor is off due to overload."},{"question":"What is the depth of the 3RU2136-4KB1?","answer":"The depth is 117 mm. Overall dimensions are 105 mm tall by 55 mm wide by 117 mm deep, Size S2."},{"question":"Where can I buy 3RU2136-4KB1?","answer":"This part is sourced to order through independent distribution. Submit an RFQ; we confirm availability and current pricing at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2136-4KB1","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/3RU2136-4KB1 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}}