{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2046-2EW1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2046-2EW1","canonicalUrl":"https://aoctrl.com/siemens/3RB2046-2EW1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2046-2EW1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2046-2EW1, CLASS 20E, 3-pole, ATEX Ex II (2) GD, screw-type terminals, 124 mm depth.","salesMarkdown":"The Siemens 3RB2046-2EW1 is a SIRIUS solid-state overload relay for three-phase motor protection. It uses straight-through current transformers on the main circuit and provides a single NC auxiliary contact for trip signaling. Rated CLASS 20E, this relay allows a longer start-up time for high-inertia loads like fans, centrifuges, or crushers before tripping on overload — it's the right choice when the motor needs a few extra seconds to spin up without nuisance trips. ATEX approval PTB 06 ATEX 3001 Ex II (2) GD covers explosive gas and dust atmospheres. ## Installation and wiring Mounts stand-alone in any position — no special orientation needed. Fastening method is stand-alone installation, meaning it doesn't require a separate base or adapter plate for the panel. Control circuit wiring uses screw-type terminals accepting 0.5 to 4 mm² solid or 0.5 to 2.5 mm² finely stranded with ferrules, and 2x (0.5 to 2.5 mm²) solid or 2x (0.5 to 1.5 mm²) stranded. For AWG, auxiliary contacts accept 2x (20 to 14). Dimensions are 70 mm wide, 106 mm high, 124 mm deep — fits a standard 70 mm wide DIN-rail footprint with 0 mm spacing required upwards, forwards, backwards, and downwards, and only 6 mm at the side. Panel layout is straightforward. ## Electrical ratings and environment The NC auxiliary contact is rated for switching at various control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.55 A at 60 V, 0.3 A at 110 V, 0.3 A at 125 V, 0.11 A at 220 V. These cover common control supply levels in industrial panels. Power dissipation is only 0.02 W per pole — negligible heat inside the enclosure, so no derating for adjacent devices in a dense panel. Operates from -25 to +60 °C, stores and transports from -40 to +80 °C, and handles 100 % relative humidity during operation. Shock resistance is 15g for 11 ms — tough enough for most industrial machinery vibration. Surge voltage withstand is 8 kV, and EMC burst immunity is 2 kV on power ports and 1 kV on signal ports per IEC 61000-4-4, severity level 3 — solid for noisy industrial environments. RoHS compliance date is July 1, 2006 — it meets the original EU RoHS directive. No REACH or UL listing is on record in this spec set, but the ATEX certification covers European hazardous-area requirements.","metaTitle":"Siemens 3RB2046-2EW1 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens SIRIUS 3RB2046-2EW1 solid-state overload relay, CLASS 20E, 3-pole, ATEX, screw terminals. Active production, sourced to order. Depth 124 mm.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"124 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"70 mm","Height":"106 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 20E","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":"8 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":"S3","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":"1 000 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":"25 ... 100 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=158537&mlfb=3RB2046-2EW1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2046-2EW1/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RB2046-2EW1 accept?","answer":"Screw terminals accept 0.5 to 4 mm² solid or 0.5 to 2.5 mm² finely stranded with ferrules, and 2x (0.5 to 2.5 mm²) solid or 2x (0.5 to 1.5 mm²) stranded. AWG for auxiliary contacts is 2x (20 to 14)."},{"question":"What is the depth of the 3RB2046-2EW1?","answer":"The depth is 124 mm. Overall dimensions are 70 mm wide by 106 mm high."},{"question":"Does the 3RB2046-2EW1 have ATEX approval?","answer":"Yes, it carries PTB 06 ATEX 3001 Ex II (2) GD certification for use in potentially explosive gas and dust atmospheres."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2046-2EW1","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/3RB2046-2EW1 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}}