{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2026-1ND0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2026-1ND0","canonicalUrl":"https://aoctrl.com/siemens/3RB2026-1ND0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2026-1ND0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2026-1ND0, solid-state overload relay, 3-pole main circuit, CLASS 10E trip, screw-type main terminals, ATEX Ex II (2) GD, 45 mm width.","salesMarkdown":"The Siemens 3RB2026-1ND0 is a SIRIUS solid-state overload relay for three-phase motor protection. It monitors the main current circuit (3 poles) and trips on overload per CLASS 10E, meaning it will disconnect before the motor windings exceed their thermal limit under a locked-rotor condition. This is the relay you specify when the motor starter needs to survive a high-inertia start without nuisance tripping, yet still protect against sustained overload. Mounts directly onto a contactor via the contactor mounting fastening method — no separate DIN-rail footprint needed, saving panel width. ## Hazardous-Area and Compliance Profile Carries ATEX approval PTB 06 ATEX 3001 Ex II (2) GD, certifying it for installation in or associated with Zone 1 / Zone 2 gas and Zone 21 / Zone 22 dust atmospheres per IEC 60079. The (2) designation means it is a associated apparatus — it can be installed in the safe area and protect the motor in the hazardous zone. Confirm the Ex marking before specifying; this is not a Zone 0 device. Surge voltage resistance rated at 6 kV, and immunity to electrical fast transients (burst) per IEC 61000-4-4 at severity level 3: 2 kV on power ports, 1 kV on signal ports. This is sufficient for industrial panels without dedicated surge suppression on the control transformer. RoHS substance prohibition date is 07/01/2006, so the part is compliant with the original RoHS directive. ## Terminals and Wiring — What Fits Main current circuit uses screw-type terminals accepting 2x (0.25... 1.5 mm²) solid or 2x (14... 10) AWG. Auxiliary and control circuit uses spring-loaded terminals accepting 2x (0.25... 1.5 mm²) finely stranded with core end processing or 2x (24... 16) AWG. The spring-loaded aux terminals save wiring time on the control side — no screw tightening, just insert and lock. Auxiliary contact ratings are voltage-dependent: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V. For DC switching: 0.55 A at 60 V, 0.3 A at 110 V and 125 V, 0.11 A at 220 V. These are the make/break capacities for the control circuit — do not exceed them when driving PLC inputs or contactor coils. Operates at -25 to +60 °C ambient, stores and transports at -40 to +80 °C. Relative humidity during operation up to 100 % — no derating for condensation, but verify the enclosure rating if used in condensing environments. Shock resistance is 15g / 11 ms, sufficient for panel-mounted applications on vibrating machinery. Dimensions: 73 mm height, 45 mm width, 75 mm depth. The 75 mm depth is the projection from the contactor face — check clearance against the enclosure door or busbar shroud.","metaTitle":"Siemens 3RB2026-1ND0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens 3RB2026-1ND0 SIRIUS solid-state overload relay, 3-pole, CLASS 10E, ATEX Ex II (2) GD, screw-type main terminals. Sourced to order against RFQ. Confirm Ex marking per IEC 60","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"75 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"45 mm","Height":"73 mm","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","Per Pole":"0.02 W","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","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 Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"07/01/2006","at AWG cables for main contacts":"2x (14 ... 10)","For Auxiliary And Control Circuit":"spring-loaded terminals","Relative Humidity During Operation":"100 %","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (24 ... 16)","due to burst according to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Size Of Contactor Can Be Combined Company-Specific":"S0","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","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","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","power loss [W] for rated value of the current at AC in hot operating state":"0.05 W","Adjustable Current Response 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=452245&mlfb=3RB2026-1ND0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2026-1ND0/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of 3RB2026-1ND0?","answer":"CLASS 10E. This means the relay will trip within 10 seconds at a locked-rotor current of 7.2× the setting current, suitable for standard induction motor starting duty."},{"question":"Does 3RB2026-1ND0 have ATEX approval?","answer":"Yes. It carries ATEX certificate PTB 06 ATEX 3001 Ex II (2) GD, making it suitable for use as associated apparatus in Zone 1/2 gas and Zone 21/22 dust atmospheres. Confirm the Ex marking per IEC 60079 before installation."},{"question":"What is the depth of 3RB2026-1ND0?","answer":"75 mm. This is the depth from the mounting face of the contactor. Ensure at least 80 mm clearance inside the enclosure to accommodate wiring and ventilation."},{"question":"Where can I buy 3RB2026-1ND0?","answer":"Sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2026-1ND0","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/3RB2026-1ND0 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}}