{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3036-2UD0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3036-2UD0","canonicalUrl":"https://aoctrl.com/siemens/3RB3036-2UD0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3036-2UD0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB3036-2UD0, CLASS 20E trip class, 50 A rated thermal current, 690 V rated insulation voltage, Size S2, for contactor mounting.","salesMarkdown":"The Siemens SIRIUS 3RB3036-2UD0 is a solid-state overload relay in Size S2, designed for contactor mounting — mates directly to the 3RT2 contactor frame. CLASS 20E trip class means it allows a 20-second cold start for motor loads before tripping, matching the acceleration curve of standard three-phase induction motors driving fans, pumps, or conveyors. Rated thermal current of 50 A at 690 V (AC-3e) covers a broad motor range up to that current draw in 400 V and 690 V line supplies. ## Trip Class and Motor Protection CLASS 20E is the standard trip class for general-purpose motor starting — it holds through a 20-second locked-rotor condition without nuisance tripping, then clears on sustained overload. The integrated auxiliary switch provides a separate signal contact (97/98) that changes state on trip, letting a PLC or annunciator capture the fault immediately. The note for message \"tripped\" on the relay face confirms the switch position for commissioning checks. The 3RB3036-2UD0 mounts directly onto the contactor via the fastening method specified — no separate DIN-rail footprint needed, saving panel width. Dimensions: 55 mm wide, 99 mm high, 104 mm deep. Main circuit wiring accepts screw-type terminals: solid or stranded 2x (0.25–1.5 mm²) for control wiring, and 2x (10–35 mm²) or 1x 50 mm² for the power circuit. Screwdriver shaft diameter 5–6 mm, Pozidriv PZ 2 tip. Contact rating of the auxiliary switch: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V — sufficient for direct PLC input or relay coil drive without an interposing relay. Shock resistance rated at 15g / 11 ms; vibration resistance per 1–6 Hz, 15 mm and 6–500 Hz, 20 m/s² for 10 cycles.","metaTitle":"Siemens 3RB3036-2UD0 SIRIUS Solid-State Overload Relay","metaDescription":"Siemens SIRIUS 3RB3036-2UD0 solid-state overload relay, CLASS 20E, rated thermal current 50 A at 690 V. Current production. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"tripped\"","Depth":"104 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"55 mm","title":"3RB3036-2UD0","Height":"99 mm","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"0.6 W","Stranded":"2x (10 ... 35 mm²), 1x 50 mm²","at 110 V":"0.3 A","at 120 V":"4 A","at 125 V":"0.3 A","at 220 V":"0.11 A","at 230 V":"3 A","Trip Class":"CLASS 20E","Rated Value":"690 V","description":"Overload relay 12.5...50 A Electronic For motor protection Size S2, Class 20E Contactor mounting Main circuit: Screw Auxiliary circuit: Spring-type terminal Manual-Automatic-Reset","During Storage":"-40 ... +80 °C","Thermal Current":"50 A","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"15g / 11 ms","For Main Contacts":"M6","Mounting Position":"any","Solid Or Stranded":"2x (0,25 ... 1,5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"solid-state overload relay","Vibration Resistance":"1-6 Hz, 15 mm; 6-500 Hz, 20 m/s²; 10 cycles","at 480 V rated value":"50 A","at 600 V rated value":"50 A","Size Of Overload Relay":"S2","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-25 ... +60 °C","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Screwdriver Tip":"Pozidriv PZ 2","according to IEC 60068-2-27":"15g / 11 ms; Signaling contact 97 / 98 in position \"Tripped\": 8g / 11 ms","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":"electronic","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"50 A","for AC motors at 500 V at 50 Hz":"11 ... 30 kW","for AC motors at 690 V at 50 Hz":"11 ... 45 kW","For Auxiliary And Control Circuit":"spring-loaded terminals","Between Main And Auxiliary Circuit":"690 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 200 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gG: 250 A","for 3-phase motors at 400 V at 50 Hz":"7.5 ... 22 kW","for AWG cables for auxiliary contacts":"1x (24 ... 16), 2x (24 ... 16)","Between Auxiliary And Auxiliary Circuit":"300 V","due to burst according to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Finely Stranded Without Core End Processing":"2x (0.25 ... 1.5 mm²)","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","operational current at AC-3e at 400 V rated value":"50 A","Size Of Contactor Can Be Combined Company-Specific":"S2","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Type Of Voltage Supply Via Input/Output Link Master":"No","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","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","power loss [W] for rated value of the current at AC in hot operating state":"1.8 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"12.5 ... 50 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/374aecd95ce9155e54b075738b5644e1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=134045&mlfb=3RB3036-2UD0"},"ai":{"faq":[{"question":"What is the trip class of 3RB3036-2UD0?","answer":"CLASS 20E, meaning it allows a 20-second cold start before tripping on overload — suited for standard three-phase motor starting."},{"question":"Can 3RB3036-2UD0 be used with a Siemens 3RT contactor?","answer":"Yes, it is designed for contactor mounting and mates directly to the 3RT2 contactor frame."},{"question":"What is 3RB3036-2UD0's listed note for message 'tripped'?","answer":"The relay face carries a note for message 'tripped' that confirms the auxiliary switch position during commissioning checks."},{"question":"What is 3RB3036-2UD0's listed depth?","answer":"104 mm."},{"question":"Where can I buy the 3RB3036-2UD0 overload relay?","answer":"This part is sourced to order against an RFQ. Availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3036-2UD0","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/3RB3036-2UD0 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}}