{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2015-2NB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2015-2NB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2015-2NB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2015-2NB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2015-2NB0, CLASS 20E, contactor mounting, screw terminals, IP20, ATEX Ex II (2) GD.","salesMarkdown":"The Siemens 3RB2015-2NB0 is a SIRIUS solid-state overload relay — the part that sits between a contactor and a motor, watching current and tripping on overload before the winding cooks. Mounts directly onto a contactor — no DIN rail needed, which saves a slot in a crowded panel. Accepts solid or stranded wire from 0.5 to 4 mm² (or 2× 0.5 to 2.5 mm²), with AWG equivalents of 2× 18 to 14 for the main contacts. That's a tight fit for retrofit into existing panels without re-spacing rails. IP20 on the front — finger-safe for the panel builder, but not for washdown; keep it inside the enclosure. ATEX certified PTB 06 ATEX 3001 Ex II (2) GD, so it's approved for use in potentially explosive atmospheres where a motor overload could ignite a gas or dust cloud. The relay itself is not in the hazardous zone — it sits in the safe-area panel, protecting the motor in the zone. Shock-rated to 15g for 11 ms, which covers most industrial vibration from nearby crushers or presses. Storage and transport range is -40 to +80 °C, wider than the operating range — fine for warehouse or trucking in extreme climates.","metaTitle":"Siemens 3RB2015-2NB0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens 3RB2015-2NB0 SIRIUS solid-state overload relay, CLASS 20E trip, contactor-mount, ATEX, IP20, 690 V max. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"73 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","Height":"64 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 20E","At The Side":"6 mm","On The Front":"IP20","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":"690 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 (18 ... 14)","Surge voltage resistance rated value":"6 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":"690 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":"S00","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":"0.32 ... 1.25 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=115321&mlfb=3RB2015-2NB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2015-2NB0/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does it accept?","answer":"Screw terminals accept 0.5 to 4 mm² solid or stranded, or 2× 0.5 to 2.5 mm². AWG equivalent is 2× 18 to 14 for the main circuit."},{"question":"What is the trip class and what does it mean?","answer":"CLASS 20E means the relay will trip in 20 seconds at 7.2× the current setting. That's the standard for general-purpose induction motors — fast enough to protect the winding, slow enough to ride through normal start-up inrush."},{"question":"Does it have ATEX approval?","answer":"Yes, certified PTB 06 ATEX 3001 Ex II (2) GD. Suitable for protecting motors in potentially explosive gas or dust atmospheres when the relay is mounted in the safe-area panel."},{"question":"What are the clearance requirements around this relay?","answer":"Zero clearance needed upwards, forwards, backwards, and downwards. Only 6 mm at the side. That makes it a good fit for tight retrofits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2015-2NB0","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/3RB2015-2NB0 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}}