{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2133-4UX1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2133-4UX1","canonicalUrl":"https://aoctrl.com/siemens/3RB2133-4UX1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4UX1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2133-4UX1, 3-pole, adjustable trip class 5E/10E/20E/30E, ATEX Ex II (2) GD, spring-loaded terminals, 109 mm depth.","salesMarkdown":"The Siemens 3RB2133-4UX1 is a SIRIUS solid-state overload relay for three-phase motor circuits. It protects against overload and phase imbalance by monitoring current through straight-through transformers, and its trip class is field-adjustable among 5E, 10E, 20E, and 30E — so you can match the relay's response to the motor's starting characteristics without stocking multiple fixed-class units. The trip class adjustment (5E through 30E) is the main selection parameter: a 5E setting trips fast for short-start motors (e.g., centrifugal pumps), while 30E accommodates high-inertia loads like fans or conveyors that take longer to accelerate. The relay carries one NC auxiliary contact for the control circuit, wired via spring-loaded terminals that accept 2x (0.25 to 1.5 mm²) solid or finely stranded wire — no screwdriver needed for termination, which speeds panel wiring. It is rated for surge voltage withstand of 6 kV and passes burst immunity at 2 kV on power ports and 1 kV on signal ports per IEC 61000-4-4 severity level 3, so it holds up in electrically noisy industrial panels without nuisance tripping. Shock resistance is 15g for 11 ms, enough for mounting on vibrating machinery. The straight-through transformer design means the main power conductors pass directly through the relay body, keeping wiring simple and reducing panel clutter.","metaTitle":"Siemens 3RB2133-4UX1 SIRIUS solid-state overload relay, adju","metaDescription":"Siemens 3RB2133-4UX1 SIRIUS solid-state overload relay, 3-pole, adjustable trip class 5E-30E, ATEX, active production. Depth 109 mm. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"109 mm","Solid":"2x (0.25 ... 1.5 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":"spring-loaded terminals","Relative Humidity During Operation":"100 %","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (24 ... 16)","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","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=200117&mlfb=3RB2133-4UX1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4UX1/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this relay carry?","answer":"It carries ATEX type PTB 06 ATEX 3001 Ex II (2) GD for explosive atmospheres, and its substance prohibitance date is July 1, 2006, indicating RoHS compliance. Surge and burst immunity are tested to IEC 61000-4-4 and IEC 61000-4-5 standards."},{"question":"What wire sizes does the spring-loaded terminal accept?","answer":"The auxiliary and control circuit terminals accept 2x (0.25 to 1.5 mm²) solid or finely stranded wire, or 2x (24 to 16 AWG)."},{"question":"Can this relay be used in a motor starter with a different contactor brand?","answer":"The 3RB2133-4UX1 is a stand-alone device with straight-through transformers, so it does not mechanically interlock with a specific contactor. It can be wired into any starter assembly that provides the correct control voltage and current transformer path."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2133-4UX1","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/3RB2133-4UX1 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}}