{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2133-4QX1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2133-4QX1","canonicalUrl":"https://aoctrl.com/siemens/3RB2133-4QX1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4QX1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2133-4QX1, solid-state overload relay, 3-pole, adjustable trip class 5E/10E/20E/30E, 1 NC auxiliary contact, spring-loaded terminals, ATEX Ex II (2) GD, 109 x 55 x 92 mm.","salesMarkdown":"The Siemens 3RB2133-4QX1 is a SIRIUS solid-state overload relay for three-phase motor protection. It uses straight-through current transformers on the main circuit, eliminating the need to pass cables through a donut — the motor leads terminate directly to the relay's spring-loaded terminals. The trip class is field-adjustable among CLASS 5E, 10E, 20E, and 30E, which means one part number covers fast-acting (5E for short thermal time constants like submersible pumps) through slow (30E for high-inertia loads like centrifuges) without stocking four variants. The auxiliary contact circuit is rated for 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V — these are the switching capacities for the NC contact (one NC contact is present; zero CO contacts). At 60 VDC the rating drops to 0.55 A, and at 125 VDC it is 0.3 A, so if you are switching a DC control loop at 125 V the contact is limited to 0.3 A. The surge voltage resistance is 6 kV, and EMC burst immunity per IEC 61000-4-4 is 2 kV on power ports and 1 kV on signal ports, severity level 3 — this relay can live in a panel with contactors and drives without external suppression on the auxiliary circuit, though the free-wheel diode rule still applies if you switch an inductive DC load. Relative humidity during operation can be 100 % — no derating for condensation environments. Shock resistance is 15 g for 11 ms, which covers the typical vibration profile of a conveyor transfer station or a compressor skid. The dimensions are 109 mm depth, 55 mm width, 92 mm height. Clearances: 0 mm upwards, forwards, backwards, and downwards; 6 mm to the side. That zero-clearance spec means the relay can be stacked directly against adjacent devices without derating for airflow, which simplifies panel layout on a tight gland plate. The auxiliary and control circuit uses spring-loaded terminals accepting 2x (0.25... 1.5 mm²) solid or finely stranded with core-end processing, or 2x (24... 16) AWG. No screwdriver torque spec to worry about — spring terminals are vibration-resistant and faster to wire on a production panel build. ATEX certification is PTB 06 ATEX 3001 Ex II (2) GD, which qualifies it for installation in Zone 2 gas and Zone 22 dust atmospheres when used with appropriately rated enclosures. RoHS substance prohibition date is 07/01/2006, meaning it complies with the original RoHS directive. This documentation package supports the audit trail for a pharmaceutical GMP line — the ATEX cert, the surge/EMC test levels, and the material prohibition date are all on the nameplate and the declaration of conformity.","metaTitle":"Siemens 3RB2133-4QX1 SIRIUS Solid-State Overload Relay, Adju","metaDescription":"Siemens 3RB2133-4QX1 SIRIUS solid-state overload relay, 3-pole, adjustable trip class 5E/10E/20E/30E. ATEX Ex II (2) GD. Active production. Quoted 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":"6 ... 25 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=10642&mlfb=3RB2133-4QX1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4QX1/alternatives.json"},"ai":{"faq":[{"question":"What trip classes can the 3RB2133-4QX1 be set to?","answer":"It is adjustable to CLASS 5E, 10E, 20E, or 30E. One relay covers fast, standard, and slow trip curves without changing parts."},{"question":"What ATEX rating does this overload relay carry?","answer":"It carries PTB 06 ATEX 3001 Ex II (2) GD, suitable for Zone 2 gas and Zone 22 dust hazardous areas when installed in a compliant enclosure."},{"question":"Where can I buy the 3RB2133-4QX1 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2133-4QX1","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/3RB2133-4QX1 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}}