{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2045-1EB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2045-1EB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2045-1EB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2045-1EB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2045-1EB0 solid-state overload relay, CLASS 10E, ATEX Ex II (2) GD, 124 mm depth, 70 mm width, contactor mounting.","salesMarkdown":"The 3RB2045-1EB0: Mounts directly onto a contactor — no DIN rail required, no extra bracket. The 70 mm width and 124 mm depth fit the standard SIRIUS contactor footprint. Side clearance is 6 mm; zero clearance needed above, below, or behind the unit. Screw-type terminals on both the main current circuit and the auxiliary/control circuit. Main terminals accept stranded wire from 10 to 70 mm² (or 2x 10 to 50 mm²), plus AWG 2x 10 to 1/0 or single 10 to 2/0. Auxiliary terminals take 0.5 to 4 mm² solid, or 2x 0.5 to 2.5 mm² stranded. That covers most motor-circuit wiring in a standard panel. The ATEX marking (PTB 06 ATEX 3001 Ex II (2) GD) means it can be wired into the control circuit of an Ex-rated motor starter in a hazardous area; the (2) indicates it's associated apparatus, not installed inside the zone itself. The auxiliary contact ratings cover the common control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V — enough to drive a PLC input or a contactor coil directly. Power dissipation is negligible: 0.05 W total at rated AC hot state, 0.02 W per pole. That keeps the enclosure heat rise low even in a densely packed panel. ## EMC and surge Burst immunity per IEC 61000-4-4 at severity level 3: 2 kV on power ports, 1 kV on signal ports. Surge voltage resistance rated at 8 kV. That puts it in the 'industrial environment' class — no extra external suppression needed for most panel installations. The 100 % relative humidity rating during operation means it handles condensation-prone environments without conformal coating.","metaTitle":"Siemens 3RB2045-1EB0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens 3RB2045-1EB0 SIRIUS solid-state overload relay, CLASS 10E, ATEX Ex II (2) GD, 124 mm depth, 70 mm width. Active 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","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","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 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","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 %","due to burst acc. to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code acc. to IEC 81346-2":"F","Surge Voltage Resistance Rated Value":"8 kV","at AC in hot operating state per pole":"0.02 W","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 NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","with degree of pollution 3 at AC rated value":"1 000 V","electrostatic discharge acc. to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","field-based interference acc. to IEC 61000-4-3":"10 V/m","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","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","type of connectable conductor cross-sections at AWG cables for auxiliary contacts":"2x (20 ... 14)","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=78120&mlfb=3RB2045-1EB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2045-1EB0/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RB2045-1EB0?","answer":"The depth is 124 mm, with a width of 70 mm and height of 106 mm."},{"question":"What wire sizes does the 3RB2045-1EB0 accept on the main terminals?","answer":"Main terminals accept stranded wire from 10 to 70 mm² (single) or 2x 10 to 50 mm², plus AWG 2x 10 to 1/0 or single 10 to 2/0. Auxiliary terminals take 0.5 to 4 mm² solid, or 2x 0.5 to 2.5 mm² stranded."},{"question":"What compliance documentation does Siemens provide for 3RB2045-1EB0?","answer":"The part carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD for explosive atmospheres. EMC compliance is documented per IEC 61000-4-4 (burst) at severity level 3. Standard Siemens declarations of conformity for CE, RoHS, and REACH are available on request."},{"question":"How do I get current pricing and availability for 3RB2045-1EB0?","answer":"Submit an RFQ through this listing. We source through independent distribution; availability and current pricing are confirmed at quote time — no automated stock numbers here, just a real quote against your quantity and delivery window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2045-1EB0","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/3RB2045-1EB0 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}}