{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2136-4RB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2136-4RB0","canonicalUrl":"https://aoctrl.com/siemens/3RU2136-4RB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2136-4RB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2136-4RB0 thermal overload relay, CLASS 10A, Size S2, 37 kW at 400 V AC-3e, screw-type terminals, contactor mounting.","salesMarkdown":"## CLASS 10A trip curve and motor protection fit The 3RU2136-4RB0 is a SIRIUS thermal overload relay with a CLASS 10A trip class, meaning it will trip within 10 seconds at 7.2× the current setting — fast enough to protect standard induction motors during a locked-rotor event without nuisance tripping on normal starting transients. Rated for AC-3e duty up to 690 V, it handles motor loads at 37 kW at 400 V, 55 kW at 500 V, and 75 kW at 690 V, with a maximum continuous current of 80 A at both 480 V and 600 V. The thermal bimetallic release design compensates for ambient temperature changes across -40 to +60 °C, so the trip point stays accurate whether the panel sits in a cold warehouse or a warm machine room. ## Mounting and wiring — contactor-mount S2 frame Fastens directly to the contactor via the M6 main contact screws — no DIN-rail adapter needed, which saves rail space in a crowded panel. Main circuit terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire, terminated with screw-type terminals requiring a Pozidriv PZ 2 screwdriver tip. Dimensions are 55 mm wide, 90 mm high, and 105 mm deep — the S2 frame size fits the standard SIRIUS contactor footprint. ## Auxiliary contact ratings and power dissipation The integrated auxiliary switch (NO/NC changeover) is rated 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.75 A at 690 V — these are the make/break capacities for the signal circuit, not the main motor current. At lower control voltages, the 60 V rating drops to 0.3 A, and at 125 V or 220 V it is 0.22 A and 0.11 A respectively — important when selecting a PLC output or control transformer for the trip signal. Each pole dissipates 6.3 W at rated current — factor this into the panel thermal budget, especially in a sealed enclosure with multiple relays stacked. ## Environmental range and compliance Operates from -40 to +70 °C and survives storage and transport from -55 to +80 °C — suitable for unheated warehouses and truck shipments across climate zones. Mountable in any position, which simplifies panel layout when the contactor is oriented vertically or horizontally. Substance prohibitance dated October 15, 2014, indicating RoHS compliance per the EU directive effective from that date.","metaTitle":"Siemens 3RU2136-4RB0 SIRIUS Thermal Overload Relay","metaDescription":"Siemens 3RU2136-4RB0 SIRIUS thermal overload relay, CLASS 10A trip class, 37 kW at 400 V AC-3e. Active production, sourced to order. Request a quote.","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","title":"3RU2136-4RB0","Height":"90 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"6.3 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","description":"Overload relay 70...80 A Thermal For motor protection Size S2, Class 10A Contactor mounting Main circuit: Screw Auxiliary circuit: Screw Manual-Automatic-Reset","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":"80 A","at 500 V rated value":"55 kW","at 600 V rated value":"80 A","at 690 V rated value":"75 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":"80 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":"80 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":"18.9 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"70 ... 80 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":"$77.47","stockQuantity":0,"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=28975&mlfb=3RU2136-4RB0"},"ai":{"faq":[{"question":"How can I get pricing and availability for the 3RU2136-4RB0?","answer":"This part is sourced to order through independent distribution. Submit an RFQ with your target quantity; current pricing and lead time are confirmed at quote time."},{"question":"What does the 'for message Tripped' note mean on this overload relay?","answer":"The note indicates that the auxiliary contact position signals a 'Tripped' status when the relay has operated — it is the normally-open contact that closes on overload, used to trigger an alarm or PLC input."},{"question":"What are the key motor ratings for the 3RU2136-4RB0?","answer":"At 400 V AC-3e it is rated 37 kW, at 500 V it is 55 kW, and at 690 V it is 75 kW. The maximum continuous current is 80 A at both 480 V and 600 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2136-4RB0","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/3RU2136-4RB0 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}}