{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2055-1FW2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2055-1FW2","canonicalUrl":"https://aoctrl.com/siemens/3RB2055-1FW2","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2055-1FW2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2055-1FW2, Class 10E, ATEX Ex II (2) GD, contactor-mount or standalone installation.","salesMarkdown":"It mounts directly on a contactor or as a standalone unit, giving the panel builder flexibility in layout. The ATEX certification PTB 06 ATEX 3001 Ex II (2) GD permits use in Zone 2 gas and Zone 22 dust hazardous areas when paired with an appropriate enclosure — a compliance detail that often decides the BOM for explosive-environment lines. Rated for continuous operation from -25 to +60 °C ambient, with storage down to -40 °C. The 100 % relative humidity rating (condensing) means it can handle washdown environments without conformal coating on the electronics. Surge withstand at 8 kV (impulse) and burst immunity at 2 kV on power ports (severity 3 per IEC 61000-4-4) means it holds up in industrial electrical noise — no external surge suppressor needed for most panels. Mounts in any position — vertical, horizontal, or flat — with 6 mm clearance to adjacent devices on the side. The straight-through transformer design keeps the main power conductors passing directly through the relay body, simplifying bus-bar routing. Accepts solid or finely stranded conductors: 0.5 to 4 mm² solid (or 2× 0.5 to 2.5 mm²), and 0.5 to 2.5 mm² finely stranded with ferrules (2× 0.5 to 1.5 mm²). The spring-cage terminals match standard DIN-rail terminal block practice.","metaTitle":"Siemens 3RB2055-1FW2 SIRIUS Solid-State Overload Relay, Clas","metaDescription":"Siemens 3RB2055-1FW2 SIRIUS solid-state overload relay, Class 10E, ATEX Ex II (2) GD, contactor-mount or standalone. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"155 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"120 mm","Height":"119 mm","Maximum":"2 000 m","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","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/stand-alone installation","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":"straight-through transformers","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","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":"S6","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":"50 ... 200 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=519244&mlfb=3RB2055-1FW2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2055-1FW2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RB2055-1FW2 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability."},{"question":"What is the trip class of 3RB2055-1FW2?","answer":"Trip class 10E — it trips within 10 seconds at 7.2× the current setting, matching standard motor protection requirements."},{"question":"Does 3RB2055-1FW2 have ATEX certification?","answer":"Yes, it carries PTB 06 ATEX 3001 Ex II (2) GD certification for use in Zone 2 gas and Zone 22 dust hazardous areas."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2055-1FW2","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/3RB2055-1FW2 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}}