{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2045-1UB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2045-1UB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2045-1UB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2045-1UB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2045-1UB0, CLASS 10E trip, 1000 V AC-3 max, screw-type main terminals, contactor-mount, ATEX Ex II (2) GD.","salesMarkdown":"The Siemens 3RB2045-1UB0 is a SIRIUS solid-state overload relay — a motor-protection device that monitors current and trips on overload, without bimetallic thermal lag. It mounts directly to a contactor (contactor mounting), saving a DIN-rail slot and keeping the motor branch compact. Main circuit terminals are screw-type, accepting solid wire 0.5 to 4 mm² (or 2× 0.5 to 2.5 mm²) and stranded up to 70 mm² — covers most motor leads from fractional-horsepower up to about 30 kW at 400 V. Mounts in any position; side clearance to adjacent devices is 6 mm. Depth is 124 mm, width 70 mm, height 106 mm — check that the contactor footprint leaves room for the relay body above it. ATEX certification PTB 06 ATEX 3001 Ex II (2) GD covers use in potentially explosive gas and dust atmospheres (Zone 1/2 gas, Zone 21/22 dust) when paired with an appropriate contactor and enclosure.","metaTitle":"Siemens 3RB2045-1UB0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens 3RB2045-1UB0 SIRIUS solid-state overload relay, CLASS 10E, 1000 V AC-3 max, screw terminals, ATEX Ex II (2) GD. Current production. Quoted to order.","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","Maximum":"2 000 m","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","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 10E","At The Side":"6 mm","On The Front":"IP00","Mounting type":"Contactor mounting","During Storage":"-40 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","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 Auxiliary Contacts":"0","For Main Current Circuit":"screw-type terminals","at AC-3 rated value maximum":"1 000 V","at AC in hot operating state":"0.05 W","Relative humidity during operation":"100 %","due to burst acc. to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","at AWG conductors for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","Surge voltage resistance rated value":"8 kV","Reference code acc. to DIN EN 81346-2":"F","at AC in hot operating state per pole":"0.02 W","With Degree Of Pollution 3 Rated Value":"1 000 V","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","at AWG conductors for auxiliary contacts":"2x (20 ... 14)","For Auxiliary And Control Current Circuit":"screw-type terminals","Number of NC contacts for auxiliary contacts":"1","Number of NO contacts for auxiliary contacts":"1","Electrostatic discharge acc. to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Size of contactor can be combined company-specific":"S3","due to conductor-earth surge acc. to IEC 61000-4-5":"2 kV (line to earth) corresponds to degree of severity 3","Removable Terminal For Auxiliary And Control Circuit":"Yes","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A","Adjustable pick-up 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=395747&mlfb=3RB2045-1UB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2045-1UB0/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class and why does it matter?","answer":"CLASS 10E means the relay trips within 10 seconds at 7.2× the set current. That's the standard speed for protecting general-purpose induction motors — fast enough to prevent winding damage during a stall, slow enough to let the motor start without dropping out."},{"question":"What compliance documentation does this relay carry?","answer":"It carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD for explosive atmospheres. The surge voltage resistance is rated at 8 kV, and burst immunity meets IEC 61000-4-4 severity level 3 (2 kV on power ports, 1 kV on signal ports)."},{"question":"Where can I buy 3RB2045-1UB0 and get current pricing?","answer":"This part is sourced and quoted to order through independent distribution. Submit an RFQ for current pricing and availability — the quote will reflect real-time market conditions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2045-1UB0","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/3RB2045-1UB0 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}}