{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3026-2QB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3026-2QB0","canonicalUrl":"https://aoctrl.com/siemens/3RB3026-2QB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3026-2QB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB3026-2QB0, Class 20E, 25 A thermal current, for contactor mounting, size S0.","salesMarkdown":"## Class 20E trip, 25 A thermal current The Siemens 3RB3026-2QB0 is a SIRIUS solid-state overload relay rated for a thermal current of 25 A, with a trip class of CLASS 20E. This means it allows a motor to draw locked-rotor current for up to 20 seconds before tripping — the right-sized spec for standard industrial motor starts that don't need a fast trip, like pumps and conveyors. ## Mounts directly on the contactor This relay mounts directly onto the contactor via the fastening method specified for contactor mounting, size S0. It snaps onto the contactor without extra DIN-rail space, keeping the panel layout tight. The auxiliary switch is integrated, with signaling contacts rated at 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V. The trip indicator shows a message \"tripped\" when the relay has operated.","metaTitle":"Siemens 3RB3026-2QB0 Overload Relay, Class 20E, 25 A","metaDescription":"Siemens SIRIUS solid-state overload relay, 25 A thermal current, Class 20E trip. For contactor mounting. Sourced to order. Request a quote.","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","title":"3RB3026-2QB0","Height":"87 mm","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"0.4 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","description":"Overload relay 6...25 A Electronic For motor protection Size S0, Class 20E Contactor mounting Main circuit: Screw Auxiliary circuit: Screw Manual-Automatic-Reset","During Storage":"-40 ... +80 °C","Thermal Current":"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":"25 A","at 600 V rated value":"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":"25 A","for AC motors at 500 V at 50 Hz":"4 ... 15 kW","for AC motors at 690 V at 50 Hz":"5.5 ... 22 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: 63 A, J: 100 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gG: 125 A, RK5: 100 A","at AWG cables for auxiliary contacts":"1x (20 ... 14), 2x (20 ... 14)","for 3-phase motors at 400 V at 50 Hz":"3 ... 11 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":"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":"1.2 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"6 ... 25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$169.59","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fc215b8a28596687a96f821f5d446d70.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=481743&mlfb=3RB3026-2QB0"},"ai":{"faq":[{"question":"What is the trip class of Siemens 3RB3026-2QB0?","answer":"The trip class is CLASS 20E, meaning the relay allows up to 20 seconds of locked-rotor current before tripping. This suits standard motor starts on pumps, fans, and conveyors."},{"question":"Is the Siemens 3RB3026-2QB0 compatible with Siemens 3RT contactors?","answer":"Yes, the relay is designed for contactor mounting (size S0) and fastens directly onto the contactor. It is compatible with the Siemens 3RT series contactors in the same frame size."},{"question":"Does the Siemens 3RB3026-2QB0 have a trip indicator?","answer":"Yes, the relay includes a trip indicator that displays the message \"tripped\" when the overload relay has operated."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3026-2QB0","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/3RB3026-2QB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}