{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2133-4UW1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2133-4UW1","canonicalUrl":"https://aoctrl.com/siemens/3RB2133-4UW1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4UW1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2133-4UW1 solid-state overload relay, 3-pole, screw terminals, adjustable trip class 5E/10E/20E/30E, ATEX Ex II (2) GD, 109 mm depth.","salesMarkdown":"## Solid-state overload relay for motor protection The Siemens 3RB2133-4UW1 is a SIRIUS solid-state overload relay rated for 3-pole main current circuits with straight-through transformers and screw-type terminals for auxiliary and control wiring. It protects motors by monitoring current and tripping when an overload condition persists beyond the selected trip class. Trip class is field-adjustable among CLASS 5E, 10E, 20E, and 30E, letting you match the relay's response to the motor's starting profile — a 5E setting for short-duration starts like centrifugal pumps, or 30E for high-inertia loads such as conveyors or crushers. The relay carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, meaning it is approved for use in potentially explosive atmospheres as an associated apparatus — the (2) indicates it can be installed outside the hazardous zone but must be connected to equipment within it per the installation directive. Mounts in any position via stand-alone installation — no DIN-rail adapter required, though the 55 mm width and 92 mm height are compatible with standard enclosure layouts. Depth is 109 mm, which is the dimension to check when closing a shallow panel door or fitting alongside busbars. This zero-clearance stacking on four faces allows dense panel packing, but the side gap of 6 mm must be maintained for heat dissipation. Withstands 100 % relative humidity during operation and shock of 15g for 11 ms — suitable for installation on vibrating machinery or in unconditioned enclosures. ## Electrical ratings and auxiliary contacts The auxiliary contact block provides 1 NC contact (no CO contacts). Switching capacity varies with voltage: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and lower ratings at 60 V (0.55 A), 110 V (0.3 A), 125 V (0.3 A), and 220 V (0.11 A). These are the maximum currents the NC contact can break at those voltages — use them to confirm the control circuit load. Surge voltage resistance is rated at 6 kV, and immunity to electrical fast transients (burst) per IEC 61000-4-4 is 2 kV on power ports and 1 kV on signal ports, severity level 3. This meets the EMC requirements for industrial environments without external filtering in most installations. ## Wiring and conductor specifications Screw-type terminals accept solid conductors from 0.5 to 4 mm², or two conductors of 0.5 to 2.5 mm² each. For finely stranded wire with ferrule, the range is 0.5 to 2.5 mm², or two conductors of 0.5 to 1.5 mm². AWG equivalents for auxiliary contacts are 2x (20 to 14). Substance prohibition date per RoHS-like requirements is 07/01/2006, confirming compliance with the original RoHS directive.","metaTitle":"Siemens 3RB2133-4UW1 SIRIUS Solid-State Overload Relay, 3-Po","metaDescription":"Siemens SIRIUS 3RB2133-4UW1 solid-state overload relay, 3-pole, adjustable trip class 5E/10E/20E/30E. ATEX certified, 109 mm depth. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"109 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"55 mm","Height":"92 mm","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","Per Pole":"0.02 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","Backwards":"0 mm","Downwards":"0 mm","Trip Class":"CLASS 5E, 10E, 20E and 30E adjustable","At The Side":"6 mm","During Storage":"-40 ... +80 °C","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","Product Brand Name":"SIRIUS","Type Of Protection":"PTB 06 ATEX 3001 Ex II (2) GD","Product Designation":"solid-state overload relay","For Main Current Circuit":"straight-through transformers","Substance Prohibitance (Date)":"07/01/2006","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"100 %","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","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":"0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","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","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/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":"0.05 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"12.5 ... 50 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=451803&mlfb=3RB2133-4UW1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4UW1/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does the 3RB2133-4UW1 carry?","answer":"It carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD for explosive atmospheres, RoHS substance prohibition dated 07/01/2006, and EMC immunity per IEC 61000-4-4 severity level 3. The manufacturer's declaration of conformity covers these certifications."},{"question":"What are the key ratings of the 3RB2133-4UW1?","answer":"It is a 3-pole solid-state overload relay with adjustable trip class 5E, 10E, 20E, or 30E. The auxiliary NC contact switches up to 4 A at 120 V or 3 A at 230 V. Surge voltage resistance is 6 kV, and it operates from -25 to +60 °C."},{"question":"Where can I buy the 3RB2133-4UW1 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will the 3RB2133-4UW1 drop into a panel specified around the 3RU2116-1FC1?","answer":"The 3RB2133-4UW1 is a solid-state overload relay while the 3RU2116-1FC1 is a thermal overload relay — different operating principles and wiring requirements. Both are 3-pole SIRIUS devices with similar mounting footprint, but the solid-state unit requires a separate control voltage and has different auxiliary contact ratings. Verify the control circuit voltage and load before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2133-4UW1","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/3RB2133-4UW1 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}}