{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2066-2GC2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2066-2GC2","canonicalUrl":"https://aoctrl.com/siemens/3RB2066-2GC2","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2066-2GC2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2066-2GC2 solid-state overload relay, 250 A rated operational current, CLASS 20E trip class, 1000 V rated insulation voltage, size S10/S12, contactor mounting or stand-alone installation.","salesMarkdown":"## 250 A solid-state motor protection with CLASS 20E trip curve The Siemens 3RB2066-2GC2 is a SIRIUS solid-state overload relay rated for 250 A continuous current at up to 1000 V (AC-3e), making it suitable for protecting motors in the 45–160 kW range at 500 V / 50 Hz. Its CLASS 20E trip characteristic means the relay allows a 20-second overload at 7.2× rated current before tripping — matching the thermal time constant of standard AC induction motors during start-up. The electronic design provides temperature-compensated protection across -25 to +60 °C ambient, with an integrated auxiliary switch that signals the tripped state via a dedicated message output. ## Mounting and wiring flexibility for panel integration The relay mounts directly onto a contactor or as a stand-alone unit on a mounting plate, accepting busbar connections for the main circuit and solid/stranded wire up to 4 mm² for the control terminals. Dimensions of 120 mm wide × 119 mm high × 155 mm deep fit the S10/S12 frame size, and the relay can be installed in any orientation without derating. ## Auxiliary contact ratings and environmental robustness The integrated signaling contact is rated for switching loads across common control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.11 A at 220 V — covering both AC and DC control circuits. The relay withstands shock up to 15 g / 11 ms and vibration per IEC 60068-2-27 (1–6 Hz, 15 mm; 6–500 Hz, 20 m/s²), with a storage and transport temperature range of -40 to +80 °C.","metaTitle":"Siemens 3RB2066-2GC2 SIRIUS Solid-State Overload Relay","metaDescription":"Siemens 3RB2066-2GC2 SIRIUS solid-state overload relay, 250 A rated current, CLASS 20E trip curve. Active production, 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":"155 mm","Solid":"1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²)","Width":"120 mm","title":"3RB2066-2GC2","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: Screw 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":"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":"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":"screw-type 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 (20 ... 14)","for 3-phase motors at 400 V at 50 Hz":"30 ... 132 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":"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","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","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/19a2c56a292c7cd427398959126a295c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=373591&mlfb=3RB2066-2GC2"},"ai":{"faq":[{"question":"Where can I buy the Siemens 3RB2066-2GC2 and get a price?","answer":"The 3RB2066-2GC2 is sourced to order through authorized distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2066-2GC2","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/3RB2066-2GC2 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}}