{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2066-1GF2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2066-1GF2","canonicalUrl":"https://aoctrl.com/siemens/3RB2066-1GF2","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2066-1GF2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2066-1GF2 solid-state overload relay, 250 A rated operational current, CLASS 10E trip class, S10/S12 size, contactor mounting or stand-alone installation, 120 mm width, 119 mm height, 155 mm depth.","salesMarkdown":"## Motor protection in a packed panel The Siemens 3RB2066-1GF2 is a SIRIUS solid-state overload relay rated for 250 A operational current in AC-3e duty at up to 1000 V. It mounts directly on a contactor or stands alone, and the main circuit connects via busbar. The auxiliary switch is integrated and signals the 'tripped' message — no separate add-on block needed for that feedback. Vibration resistance is 1–6 Hz at 15 mm amplitude, then 6–500 Hz at 20 m/s² for 10 cycles — it holds up in a panel next to a big contactor cycling a conveyor. ## Wiring and termination The main contact connection is M10 busbar, torqued down for the full 250 A continuous. Auxiliary contact ratings cover the common control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V. That 4 A at 120 V gives you headroom to drive a PLC input and an indicator lamp off the same contact. The solid-state design means no bimetal heater to swap — the trip setting is electronic, temperature-compensated from -25 to +60 °C. Storage range is -40 to +80 °C. ## Shock, vibration, and environment Shock resistance is 15g for 11 ms on the main body; the signaling contact in the tripped position is rated 8g for 11 ms per IEC 60068-2-27. That matters if this relay is on a machine with a press or a crusher — the auxiliary contact won't chatter on a bump. The thermal current rating of 250 A holds at both 480 V and 600 V. Substance prohibitance date is 07/01/2006 — this relay meets RoHS and similar material restrictions that took effect around that date.","metaTitle":"Siemens 3RB2066-1GF2 SIRIUS Solid-State Overload Relay","metaDescription":"Siemens 3RB2066-1GF2 SIRIUS solid-state overload relay, 250 A rated operational current, CLASS 10E trip class. Active production, sourced to order against RFQ.","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":"3RB2066-1GF2","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 10E","Rated Value":"1 000 V","description":"Overload relay 55...250 A for motor protection Size S10/S12, Class 10E 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":"$146.05","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3b6a5eef4cfcca4dce7b15b296d9e8c2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=408410&mlfb=3RB2066-1GF2"},"ai":{"faq":[{"question":"What does the 'for message tripped' note mean on this overload relay?","answer":"The integrated auxiliary switch signals a 'tripped' message — meaning the normally-open (NO) contact closes when the relay trips on overload, and the normally-closed (NC) contact opens. This provides a dry-contact status to a PLC or indicator without an external trip module."},{"question":"What are the auxiliary contact ratings for the 3RB2066-1GF2?","answer":"The 4 A at 120 V is the highest current rating — suitable for most North American control circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2066-1GF2","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/3RB2066-1GF2 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}}