{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2026-2SB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2026-2SB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2026-2SB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2026-2SB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2026-2SB0, CLASS 20E, contactor mounting, screw terminals, IP20 front, ATEX Ex II (2) GD.","salesMarkdown":"The Siemens 3RB2026-2SB0 is a SIRIUS solid-state overload relay — a CLASS 20E device that mounts directly onto a contactor, not on a DIN rail. It protects motors against overload and phase failure by monitoring current through the main circuit and tripping via the contactor coil circuit. The ATEX certification (PTB 06 ATEX 3001 Ex II (2) GD) means it can be used in potentially explosive atmospheres as a associated apparatus, provided the contactor and enclosure meet the zone requirements. CLASS 20E trip class means the relay allows up to 20 seconds of locked-rotor current before tripping — a standard match for general-purpose induction motors that need a brief starting current window without nuisance trips. Mounting type is contactor mounting — this relay clips onto the front of a compatible SIRIUS contactor, saving DIN-rail space and reducing wiring between the overload and the contactor coil. The auxiliary contact ratings cover a wide control-voltage range: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V — enough to switch most PLC inputs or contactor coils directly. The 0.05 W power dissipation in hot operating state means negligible heat contribution inside the enclosure. Shock resistance of 15g / 11 ms means it survives shipping and moderate vibration on a machine. EMC immunity includes 2 kV burst on power ports and 1 kV on signal ports (severity level 3 per IEC 61000-4-4), plus 6 kV surge voltage resistance — adequate for industrial power-distribution panels without additional suppression. ## Wiring and installation details Main circuit terminals accept 0.5 to 4 mm² solid or 2x 0.5 to 2.5 mm². AWG equivalent is 2x 14 to 10. Mounting position is any, so the relay can be installed horizontally or vertically without derating — useful when panel layout forces a non-standard orientation. Clearance distances: 0 mm upwards, forwards, backwards, and downwards — the relay can be stacked flush against adjacent components. Side clearance is 6 mm minimum.","metaTitle":"Siemens 3RB2026-2SB0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens 3RB2026-2SB0 SIRIUS solid-state overload relay, CLASS 20E trip class, contactor mounting, IP20 front, ATEX certified. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"75 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","Height":"73 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 (14 ... 10)","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":"S0","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":"3 ... 12 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=468277&mlfb=3RB2026-2SB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2026-2SB0/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of 3RB2026-2SB0?","answer":"CLASS 20E — it allows up to 20 seconds of locked-rotor current before tripping, matching standard induction motor starting profiles."},{"question":"How does 3RB2026-2SB0 mount — DIN rail or contactor?","answer":"Contactor mounting — it clips directly onto a compatible SIRIUS contactor, not on a DIN rail. The 45 mm width matches the contactor footprint."},{"question":"What certifications does 3RB2026-2SB0 carry?","answer":"ATEX certification PTB 06 ATEX 3001 Ex II (2) GD for explosive atmospheres, plus IEC 61000-4-4 burst immunity at severity level 3 and 6 kV surge voltage resistance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2026-2SB0","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/3RB2026-2SB0 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}}