{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3026-2NB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3026-2NB0","canonicalUrl":"https://aoctrl.com/siemens/3RB3026-2NB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3026-2NB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, size S0, Class 20E, rated 690 V, 1.25 A thermal current, contactor mounting, screw-type terminals, order code 3RB3026-2NB0.","salesMarkdown":"It mounts directly onto a contactor and uses screw-type terminals. The relay is rated for a thermal current of 1.25 A at up to 690 V, with a Trip Class of 20E. The 1.25 A thermal current sets the upper limit of the motor FLA this relay can protect — it is sized for small motors, not large drives. The Class 20E trip curve is the standard for general-purpose induction motors; it allows normal starting inrush without nuisance trips. The signaling contact is rated 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V — enough to drive a PLC input or a small contactor coil directly. The auxiliary switch is integrated, saving panel space. At 45 mm wide, 87 mm tall, and 84 mm deep, this relay fits the S0 footprint common across the SIRIUS contactor range. It mounts in any position, which simplifies panel layout. The screw terminals accept 1x (0.5…4 mm²) solid or 2x (0.5…2.5 mm²) stranded, and the main circuit terminals take up to 2x 10 mm² stranded — typical for the current class. A Pozidriv PZ2 screwdriver tip is specified for the terminal screws.","metaTitle":"Siemens SIRIUS 3RB3026-2NB0 Solid-State Overload Relay, Clas","metaDescription":"Siemens SIRIUS 3RB3026-2NB0 solid-state overload relay, size S0, Class 20E, rated 690 V, 1.25 A thermal current. Contact us for current pricing and availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"tripped\"","Depth":"84 mm","Solid":"1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²)","Width":"45 mm","Height":"87 mm","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"0.03 W","Stranded":"2x 10 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","Trip Class":"CLASS 20E","Rated Value":"690 V","During Storage":"-40 ... +80 °C","Thermal Current":"1.25 A","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"15g / 11 ms","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"1x (0,5 ... 4 mm²), 2x (0,5 ... 2,5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"solid-state overload relay","Vibration Resistance":"1-6 Hz, 15 mm; 6-500 Hz, 20 m/s²; 10 cycles","at 480 V rated value":"1.25 A","at 600 V rated value":"1.25 A","Size Of Overload Relay":"S0","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-25 ... +60 °C","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Screwdriver Tip":"Pozidriv PZ 2","according to IEC 60068-2-27":"15g / 11 ms; Signaling contact 97 / 98 in position \"Tripped\": 9g / 11 ms","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2009","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"electronic","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"1.25 A","for AC motors at 500 V at 50 Hz":"0.12 ... 0.55 kW","for AC motors at 690 V at 50 Hz":"0.18 ... 0.75 kW","For Auxiliary And Control Circuit":"screw-type terminals","Between Main And Auxiliary Circuit":"690 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 6 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gG: 35 A, RK5: 6 A","at AWG cables for auxiliary contacts":"1x (20 ... 14), 2x (20 ... 14)","for 3-phase motors at 400 V at 50 Hz":"0.12 ... 0.37 kW","Of The Auxiliary And Control Contacts":"M3","Between Auxiliary And Auxiliary Circuit":"300 V","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":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","operational current at AC-3e at 400 V rated value":"1.25 A","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","Type Of Voltage Supply Via Input/Output Link Master":"No","contact rating of auxiliary contacts according to UL":"B600 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse 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":"0.1 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=40030&mlfb=3RB3026-2NB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB3026-2NB0/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RB3026-2NB0 used for?","answer":"It is a solid-state overload relay for motor protection, sized for a 1.25 A thermal current with a Class 20E trip curve. It mounts directly onto a contactor in the S0 frame and provides a tripped signal via its integrated auxiliary switch."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3026-2NB0","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/3RB3026-2NB0 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}}