{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2133-4QD0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2133-4QD0","canonicalUrl":"https://aoctrl.com/siemens/3RB2133-4QD0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4QD0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2133-4QD0, 3-pole, adjustable trip class 5E/10E/20E/30E, screw-type main terminals, spring-loaded aux terminals, ATEX Ex II (2) GD, contactor mounting.","salesMarkdown":"The Siemens 3RB2133-4QD0 is a SIRIUS solid-state overload relay — three-pole, designed to bolt directly onto a contactor (contactor mounting,) and protect motor circuits from sustained overcurrent without the mechanical fatigue of a bimetal strip. The trip class is adjustable across 5E, 10E, 20E, and 30E, so you dial in the protection curve that matches your motor's start-up profile: fast for short-stall pumps, slower for high-inertia loads like centrifuges or conveyors. Main power terminals are screw-type, rated for 1 x 18–2 AWG or 2 x 4 AWG max, and accept stranded up to 35 mm² — solid enough for a 50–60 A motor circuit. Auxiliary and control connections use spring-loaded terminals, which is the faster termination method for a panel builder wiring signal loops. ## Environment and Compliance This overload relay carries PTB 06 ATEX 3001 Ex II (2) GD certification, meaning it's approved for mounting in the non-hazardous area of a gas/dust zone — the associated apparatus that can sit outside the Ex zone while protecting motors inside it. It shrugs off 15g / 11 ms shock and 100 % relative humidity during operation — no special derating needed for a washdown environment as long as the enclosure is rated. Surge voltage resistance is 6 kV, and burst immunity meets IEC 61000-4-4 severity 3: 2 kV on power ports, 1 kV on signal ports. That's the level you want if the panel shares a cabinet with contactors or VFDs. Lifecycle status is current — this is a catalog-active part, not a phase-out risk. Fastening method is contactor mounting — it clips directly onto the matching SIRIUS contactor, no DIN rail required. Mounting position is any orientation. The relay body is 55 mm wide, 92 mm tall, 109 mm deep. That zero-clearance top/bottom means it stacks tight in a multi-motor lineup — no air gap needed between relay and contactor above or below. Solid conductors: 2x (0.25... 1.5 mm²) for the aux circuit; finely stranded with ferrule the same. Stranded main conductors: 2x max 25 mm² or single 1–35 mm². The built-in auxiliary contact set (spring-loaded terminals, 2x 24–16 AWG,) is rated for switching at several common control voltages: 2 A at 24 V, 0.55 A at 60 V, 0.3 A at 110 V, 4 A at 120 V, 0.3 A at 125 V, 0.11 A at 220 V, and 3 A at 230 V.","metaTitle":"Siemens 3RB2133-4QD0 SIRIUS Solid-State Overload Relay, 3-Po","metaDescription":"Siemens 3RB2133-4QD0 SIRIUS solid-state overload relay, 3-pole, adjustable trip class 5E/10E/20E/30E, ATEX Ex II (2) GD, screw main terminals. Sourced 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":"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","Stranded":"2x (max. 25 mm²), 1 ... 35 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","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":"Contactor mounting","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":"screw-type terminals","Substance Prohibitance (Date)":"07/01/2006","at AWG cables for main contacts":"2 x (max. 4), 1 x (18 ... 2)","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=516330&mlfb=3RB2133-4QD0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2133-4QD0/alternatives.json"},"ai":{"faq":[{"question":"What trip classes can the 3RB2133-4QD0 be set to?","answer":"Trip class is adjustable to CLASS 5E, 10E, 20E, or 30E — you set the protection curve to match the motor's start-up time."},{"question":"Does the 3RB2133-4QD0 have ATEX certification?","answer":"Yes, it carries PTB 06 ATEX 3001 Ex II (2) GD, approved as associated apparatus for non-hazardous-area mounting protecting motors in gas/dust zones."},{"question":"What are the main terminal wire sizes for 3RB2133-4QD0?","answer":"Screw-type main terminals accept 1 x 18–2 AWG or 2 x 4 AWG max, and stranded up to 1–35 mm² single or 2x 25 mm² max."},{"question":"Where can I buy 3RB2133-4QD0 and how is it quoted?","answer":"This part is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2133-4QD0","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/3RB2133-4QD0 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}}