{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2136-4FB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2136-4FB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU2136-4FB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2136-4FB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2136-4FB0-ZX95 thermal overload relay, Size S2, CLASS 10, 18.5 kW at 400 V, 690 V rated, screw terminals, auxiliary contacts rated 2 A at 24 V.","salesMarkdown":"It mounts directly to a contactor via the contactor mounting fastening method, making it a compact, integrated motor starter component for a control panel. The thermal overload release design means it uses a bimetallic strip that heats up and trips based on motor current, providing inverse-time protection. The auxiliary switch is integrated into the relay body, with contacts rated for pilot duty across common control voltages: 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. The note \"for message 'Tripped'\" indicates this auxiliary contact signals the tripped state back to the PLC or annunciator. ## Ratings and fit for motor protection This relay is rated for motors up to 18.5 kW at 400 V, 22 kW at 500 V, and 37 kW at 690 V. For North American applications, it carries current ratings of 40 A at both 480 V and 600 V. The maximum AC-3e rated voltage is 690 V, covering most low-voltage industrial motor circuits. Power dissipation per pole is 5.2 W, which matters for thermal management inside a sealed enclosure — three poles at full load add 15.6 W of heat that must be considered in the panel cooling calculation. The relay operates from -40 to +70 °C during operation, with temperature compensation active from -40 to +60 °C, ensuring accurate tripping regardless of ambient temperature shifts in an outdoor or unconditioned enclosure. Physical dimensions are 55 mm wide, 90 mm high, and 105 mm deep — the S2 form factor fits standard Siemens contactor footprints. Mounting position is any orientation, giving flexibility in dense panel layouts. Main contacts use screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. The screw size for main contacts is M6. Use a Pozidriv PZ 2 screwdriver tip with shaft diameter 5 to 6 mm for termination. Substance prohibitance date is October 15, 2014, aligning with RoHS compliance requirements for the European market. This confirms the part meets the restricted substance limits effective from that date.","metaTitle":"Siemens 3RU2136-4FB0-ZX95 thermal overload relay, S2, CLASS","metaDescription":"Siemens SIRIUS 3RU2136-4FB0-ZX95 thermal overload relay, Size S2, CLASS 10 trip, 18.5 kW at 400 V, 690 V rated. Current lifecycle status. Auxiliary contacts rated 2 A at 24 V. Scre","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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":"5.2 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 10","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":"18.5 kW","at 480 V rated value":"40 A","at 500 V rated value":"22 kW","at 600 V rated value":"40 A","at 690 V rated value":"37 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":"40 A","for 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","Of The Auxiliary And Control Contacts":"M3","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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":"40 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":"15.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"28 ... 40 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=268653&mlfb=3RU2136-4FB0-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2136-4FB0-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class and what does it mean?","answer":"It is CLASS 10, meaning the relay will trip within 10 seconds at 7.2 times the set current. This suits standard induction motor starting without nuisance tripping."},{"question":"What are the auxiliary contact ratings?","answer":"The integrated auxiliary switch 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. The function is for signaling the tripped condition."},{"question":"What is the maximum motor power it can protect?","answer":"It is rated for motors up to 18.5 kW at 400 V, 22 kW at 500 V, and 37 kW at 690 V. At 480 V and 600 V it carries 40 A."},{"question":"What are the physical dimensions?","answer":"The relay measures 55 mm wide, 90 mm high, and 105 mm deep (Size S2). It mounts directly to a contactor and can be installed in any orientation."},{"question":"Does this relay comply with RoHS?","answer":"Yes, the substance prohibitance date of October 15, 2014 confirms RoHS compliance for restricted substances."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2136-4FB0-ZX95","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/3RU2136-4FB0-ZX95 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}}