{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2066-2MC2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2066-2MC2","canonicalUrl":"https://aoctrl.com/siemens/3RB2066-2MC2","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2066-2MC2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2066-2MC2 solid-state overload relay, 630 A rated operational current, Trip Class 20E, 1 000 V rated insulation voltage, for contactor mounting or stand-alone installation.","salesMarkdown":"## Solid-state overload relay for high-current motor circuits The 3RB2066-2MC2: Trip Class 20E means the relay allows a longer thermal overload before tripping — designed for high-inertia loads like conveyors, crushers, or fans where start-up current can persist for several seconds without damaging the motor. Mounts directly onto a contactor (S10/S12 size) or as a stand-alone unit — the fastening method is contactor mounting or stand-alone installation, with busbar connection for the main current circuit. Dimensions are 120 mm wide by 119 mm high by 155 mm deep, with any mounting position allowed. The integrated auxiliary switch (signaling contact) is built in, so no separate add-on is needed for trip indication. ## Lifecycle and sourcing — active production, no obsolescence concern Sourced through independent distribution — quoted to order against the BOM quantity. ## Environmental and compliance data Vibration resistance per IEC 60068-2-27: 15g / 11 ms for the main relay, 8g / 11 ms for the signaling contact in tripped position. Substance prohibition date of 07/01/2006 aligns with RoHS compliance. Rated insulation voltage is 1 000 V, with AC-3e rated maximum voltage also 1 000 V at 50–60 Hz.","metaTitle":"Siemens 3RB2066-2MC2 SIRIUS Solid-State Overload Relay","metaDescription":"Siemens 3RB2066-2MC2 SIRIUS solid-state overload relay, 630 A rated current, Trip Class 20E, for motor protection up to 400 kW at 500 V.","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":"3RB2066-2MC2","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 160...630 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":"630 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":"630 A","at 600 V rated value":"630 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":"630 A","for AC motors at 500 V at 50 Hz":"132 ... 400 kW","for AC motors at 690 V at 50 Hz":"160 ... 560 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: 630 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 800 A, Class L: 1600 A","at AWG cables for auxiliary contacts":"2x (20 ... 14)","for 3-phase motors at 400 V at 50 Hz":"90 ... 355 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":"630 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":"160 ... 630 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/94ea1fb87d747ec32f0277a73757a8e4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=120795&mlfb=3RB2066-2MC2"},"ai":{"faq":[{"question":"How can I source 3RB2066-2MC2 for a volume purchase?","answer":"The 3RB2066-2MC2 is available through independent distribution and is quoted to order against your BOM quantity."},{"question":"What does the 'for message tripped' note mean on this relay?","answer":"The note 'for message tripped' refers to the signaling contact (97/98) which changes state when the relay trips on overload. It provides a remote indication that the relay has operated — useful for PLC inputs or alarm annunciators in a control panel."},{"question":"What compliance documentation does Siemens provide for 3RB2066-2MC2?","answer":"The relay carries a substance prohibition date of 07/01/2006, indicating RoHS compliance. It is designed to IEC 60068-2-27 for shock and vibration, and rated for 1 000 V insulation voltage per IEC standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2066-2MC2","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/3RB2066-2MC2 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}}