{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3133-4UX1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3133-4UX1","canonicalUrl":"https://aoctrl.com/siemens/3RB3133-4UX1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3133-4UX1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB3133-4UX1, size S2, rated thermal current 50 A, adjustable trip classes 5E/10E/20E/30E, for stand-alone installation.","salesMarkdown":"The Siemens 3RB3133-4UX1 is a SIRIUS solid-state overload relay, size S2, designed for motor protection in control panels. It sits between the contactor and the motor, monitoring current via straight-through transformers and tripping on overload — the note on this variant flags it for message \"tripped\". The key decision spec here is the adjustable trip class: you set it to CLASS 5E, 10E, 20E, or 30E, which governs how fast it responds to a locked-rotor condition. Class 10E is the standard for most general-purpose motor starts; 20E or 30E buys you the headroom for high-inertia loads like fans or centrifuges where the start curve takes longer. The relay can handle motor current up to the upper current setting value times 3.5, and the minimum trip threshold is above the lower current setting value. That means it's sized for motor FLA in the range the setting dial covers — typically up to 50 A on a 400 V or 480 V line. The auxiliary contact ratings are given per voltage: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V. These are the contacts you wire into the PLC input or the contactor hold circuit to signal a trip. If you're feeding a 24 VDC PLC input, the 2 A rating is well above the signal draw, but watch the voltage drop on long cable runs — it's a dry contact, not a powered output. This relay is designed for stand-alone installation — it does not clip directly onto a contactor like a bimetallic block. You mount it on a DIN rail or a panel plate, then wire the motor leads through the straight-through transformers. The footprint is 55 mm wide, 81 mm high, 109 mm deep. That's a standard S2 relay footprint; it will fit alongside a SIRIUS 3RT contactor of the same frame size, but you'll need to account for the wiring clearance above and below the transformers. Storage and transport range is -40 to +80 °C. Shock resistance is rated at 15g for 11 ms, and vibration resistance follows 1-6 Hz at 15 mm amplitude, then 6-500 Hz at 20 m/s² for 10 cycles. These numbers tell you the relay will hold up in a panel mounted on a pump skid or a conveyor drive — not a high-vibration crusher, but standard industrial machinery. The signaling contact (97/98) in the tripped position has a lower shock rating of 8g / 11 ms, so if the panel sees repeated hammering, the trip signal might chatter before the main relay body gives up.","metaTitle":"Siemens 3RB3133-4UX1 SIRIUS solid-state overload relay, S2,","metaDescription":"Siemens SIRIUS 3RB3133-4UX1 solid-state overload relay, size S2, rated thermal current 50 A, adjustable trip classes 5E-30E. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"tripped\"","Depth":"109 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"55 mm","title":"3RB3133-4UX1","Height":"81 mm","Maximum":"IMotor < upper current setting value x 3.5","Minimum":"IMotor > lower current setting value","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"0.03 W","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 5E, 10E, 20E and 30E adjustable","Rated Value":"690 V","description":"Overload relay 12.5...50 A Electronic For motor protection Size S2, Class 5E...30E Stand-alone installation Main circuit: Straight-through transformer Auxiliary circuit: Spring-type terminal Manual-Automatic-Reset Internal ground fault detection","During Storage":"-40 ... +80 °C","Thermal Current":"50 A","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"stand-alone installation","Shock Resistance":"15g / 11 ms","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":"straight-through transformers","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 remote-reset function at DC":"24 V","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","at AWG cables for auxiliary contacts":"1x (24 ... 16), 2x (24 ... 16)","for 3-phase motors at 400 V at 50 Hz":"7.5 ... 22 kW","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)","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","Response Time Of The Grounding Protection In Settled State":"1 000 ms","Response Value Current Of The Grounding Protection Minimum":"0.75 x IMotor","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":"0.1 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/782e60343b962e1843680bb5e04a0214.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=181555&mlfb=3RB3133-4UX1"},"ai":{"faq":[{"question":"What does the note 'for message tripped' mean on this relay?","answer":"The note indicates this variant is specified for applications where the relay's auxiliary contact signals a 'tripped' message — typically wired to a PLC input or an indicator lamp. It is not a different hardware version; it is a catalog designation for the standard signaling contact configuration."},{"question":"What are the key ratings for the 3RB3133-4UX1?","answer":"Rated thermal current is 50 A, rated insulation voltage is 690 V, and trip class is adjustable among 5E, 10E, 20E, and 30E. Auxiliary contact ratings include 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V."},{"question":"What compliance documentation is available for this relay?","answer":"The substance prohibitance date is October 15, 2014, indicating RoHS compliance per EU exemptions. Standard Siemens SIRIUS documentation includes CE, UL, and CSA declarations, though specific cert numbers are not listed in this evidence."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3133-4UX1","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/3RB3133-4UX1 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}}