{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2046-2UB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2046-2UB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2046-2UB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2046-2UB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3-pole, CLASS 20E, screw-type terminals, ATEX Ex II (2) GD, 70 x 106 x 124 mm (W x H x D).","salesMarkdown":"The Siemens 3RB2046-2UB0 is a SIRIUS solid-state overload relay — a three-pole device that protects motors against overcurrent and phase imbalance by monitoring the main current circuit and tripping according to a CLASS 20E curve. CLASS 20E means the relay allows a locked-rotor current to persist for up to 20 seconds at cold start before tripping — a standard match for standard induction motors driving pumps, fans, and conveyors where the starting transient is moderate. Fastens directly onto a contactor via the contactor-mounting method, so no DIN-rail slot is consumed — it stacks on the contactor's own body, keeping the panel width to the contactor's footprint plus 6 mm side clearance. Dimensions are 70 mm wide, 106 mm high, 124 mm deep. Main circuit terminals accept screw-type connections: solid 0.5–4 mm² (2x 0.5–2.5 mm²) or stranded 2x (10–50 mm²) and single 10–70 mm². Auxiliary and control circuits use separate screw terminals. Withstands 100 % relative humidity during operation and 15g / 11 ms shock. Carries ATEX type protection PTB 06 ATEX 3001 Ex II (2) GD, meaning it can be used in Zone 2 gas and Zone 22 dust atmospheres when installed in an associated enclosure. Surge voltage resistance is 8 kV; burst immunity meets IEC 61000-4-4 severity 3. The built-in auxiliary contacts are rated for switching: 2 A at 24 V, 0.55 A at 60 V, 0.3 A at 110/125 V, 0.11 A at 220 V, and 4 A at 120 V or 3 A at 230 V. These are the maximum continuous make/break currents per contact — useful for sizing the control transformer or PLC input draw.","metaTitle":"Siemens 3RB2046-2UB0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens SIRIUS 3RB2046-2UB0 solid-state overload relay, CLASS 20E, 3-pole, screw terminals, ATEX Ex II (2) GD. Sourced to order against RFQ.","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","Stranded":"2x (10 ... 50 mm²), 10 ... 70 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 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":"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":"2x (10 ... 1/0), 1x (10 ... 2/0)","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":"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=481077&mlfb=3RB2046-2UB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2046-2UB0/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this part carry?","answer":"The part carries ATEX type protection PTB 06 ATEX 3001 Ex II (2) GD, surge voltage resistance of 8 kV, and burst immunity per IEC 61000-4-4 severity 3. It also has a substance prohibitance date of 07/01/2006, indicating RoHS compliance."},{"question":"What is the depth of the 3RB2046-2UB0?","answer":"The depth is 124 mm. Overall dimensions are 70 mm wide by 106 mm high by 124 mm deep."},{"question":"What wire sizes does the 3RB2046-2UB0 accept on the main terminals?","answer":"Main circuit screw terminals accept solid 0.5–4 mm² (2x 0.5–2.5 mm²) and stranded 2x (10–50 mm²) or single 10–70 mm². For AWG: 2x (10–1/0) or 1x (10–2/0)."},{"question":"Does the 3RB2046-2UB0 replace a 6ES7314-1AE04-0AB0?","answer":"No — those are Siemens S7-300 CPUs, a completely different product category. The 3RB2046-2UB0 is a solid-state overload relay for motor protection, not a programmable logic controller. There is no direct functional substitution between them."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2046-2UB0","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/3RB2046-2UB0 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}}