{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2066-2GF2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2066-2GF2","canonicalUrl":"https://aoctrl.com/siemens/3RB2066-2GF2","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2066-2GF2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2066-2GF2, 250 A operational current, CLASS 20E, sizes S10/S12, for message \"tripped\" signaling.","salesMarkdown":"The Siemens 3RB2066-2GF2 is a SIRIUS solid-state overload relay rated for 250 A operational current at 50/60 Hz, with a CLASS 20E trip curve. It mounts directly to a contactor or as a stand-alone unit on the panel, fitting the S10 or S12 frame sizes. The electronic overload release protects motors by monitoring current and tripping after a delay that matches the 20E characteristic — typical for standard-start induction motors driving pumps, fans, or conveyors where the start-up transient lasts up to 20 seconds. The auxiliary contact set is integrated, with a dedicated signaling contact that changes state on trip — the \"tripped\" message output. Rated switching capacity varies by voltage: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V. The main contact rating holds 250 A continuously across 480 V and 600 V circuits, with a rated insulation voltage of 1 000 V. ## Deployment and mounting Mount in any position — the relay is position-insensitive. Fasten directly to the contactor via the busbar connection for the main circuit, or install it standalone on the panel using the M10 bolts on the main contacts. The enclosure is sized at 120 mm wide, 119 mm high, 155 mm deep. Vibration resistance meets 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s² for 10 cycles. Shock resistance is 15 g for 11 ms on the main body; the signaling contact in the tripped position withstands 8 g / 11 ms. The auxiliary wiring terminals accept 2x (0.25…1.5 mm²) solid or stranded conductors.","metaTitle":"Siemens 3RB2066-2GF2 SIRIUS Solid-State Overload Relay","metaDescription":"Siemens 3RB2066-2GF2 SIRIUS solid-state overload relay, 250 A, CLASS 20E, sizes S10/S12. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"tripped\"","Depth":"155 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"120 mm","title":"3RB2066-2GF2","Height":"119 mm","at 24 V":"2 A","at 60 V":"0.55 A","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":"1 000 V","description":"Overload relay 55...250 A for motor protection Size S10/S12, Class 20E Contactor mounting/stand-alone installation Main circuit: busbar connection Auxiliary circuit: Spring-type terminal Manual-Automatic-Reset","During Storage":"-40 ... +80 °C","Thermal Current":"250 A","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Contactor mounting/stand-alone installation","Shock Resistance":"15g / 11 ms","For Main Contacts":"M10","Mounting Position":"any","Solid Or Stranded":"2x (0,25 ... 1,5 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":"250 A","at 600 V rated value":"250 A","Size Of Overload Relay":"S10, S12","For Main Current Circuit":"busbar connection","Temperature Compensation":"-25 ... +60 °C","according to IEC 60068-2-27":"15g / 11 ms; Signaling contact 97 / 98 in position \"Tripped\": 8g / 11 ms","at AC-3e rated value maximum":"1 000 V","Substance Prohibitance (Date)":"07/01/2006","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"electronic","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"250 A","for AC motors at 500 V at 50 Hz":"45 ... 160 kW","for AC motors at 690 V at 50 Hz":"55 ... 250 kW","For Auxiliary And Control Circuit":"spring-loaded terminals","Between Main And Auxiliary Circuit":"690 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 500 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 500 A, Class L: 700 A","at AWG cables for auxiliary contacts":"2x (24 ... 16)","for 3-phase motors at 400 V at 50 Hz":"30 ... 132 kW","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":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Finely Stranded Without Core End Processing":"2x (0.25 ... 1.5 mm²)","For Main Contacts With Screw-Type Terminals":"20 ... 22 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","operational current at AC-3e at 400 V rated value":"250 A","Size Of Contactor Can Be Combined Company-Specific":"S10, S12","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":"1 000 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"55 ... 250 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4bf1e193a246ffcd01b8d5aed0b2b27f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=155118&mlfb=3RB2066-2GF2"},"ai":{"faq":[{"question":"Where can I buy 3RB2066-2GF2?","answer":"The 3RB2066-2GF2 is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current pricing and availability."},{"question":"What is the note for message \"tripped\" on this relay?","answer":"The 3RB2066-2GF2 includes an integrated signaling contact that outputs a \"tripped\" message when the overload relay has operated. Its switching capacity is rated at 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V."},{"question":"What is the depth of the 3RB2066-2GF2?","answer":"The depth is 155 mm. Overall dimensions are 120 mm wide × 119 mm high × 155 mm deep."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2066-2GF2","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/3RB2066-2GF2 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}}