{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2066-1GC2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2066-1GC2","canonicalUrl":"https://aoctrl.com/siemens/3RB2066-1GC2","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2066-1GC2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2066-1GC2 solid-state overload relay, 250 A rated operational current, Class 10E trip, 120 mm width, 119 mm height, 155 mm depth, contactor mounting or stand-alone installation.","salesMarkdown":"## 250 A solid-state overload relay for motor protection The Siemens 3RB2066-1GC2 is a SIRIUS solid-state overload relay rated for 250 A operational current at up to 1000 V, 50/60 Hz. The Class 10E trip class means it will trip within 10 seconds at 7.2× rated current — matching the thermal curve of standard AC induction motors during a stall or locked-rotor event. The electronic overload release design provides temperature-compensated protection across the -25 to +60 °C operating range, so the trip curve stays consistent whether the panel is in a cold warehouse or a hot machine room. ## Mounting and panel fit This relay fits the S10/S12 size footprint and mounts directly onto a contactor or as a stand-alone unit on the DIN rail. Dimensions are 120 mm wide × 119 mm high × 155 mm deep — measure the panel depth before committing; the 155 mm projection can be tight in shallow enclosures. Main circuit connections use busbar connection (M10 bolts), while the control and auxiliary wiring accepts 1× (0.5–4 mm²) or 2× (0.5–2.5 mm²) solid or stranded wire. Any mounting position is allowed, so orientation in the panel isn't a constraint. ## Auxiliary contact ratings and signaling The integrated auxiliary switch (signaling contact 97/98) carries the 'tripped' message. Its rated switching capacity varies by voltage: 4 A at 120 V, 3 A at 230 V, 2 A at 24 V, and derated further at higher DC voltages — 0.55 A at 60 V, 0.3 A at 110/125 V, 0.11 A at 220 V. Use the 120 V / 4 A figure for the typical PLC input circuit; the DC ratings matter if you're switching a DC control loop directly. ## Environmental and mechanical endurance Rated for 15g / 11 ms shock (signaling contact 8g / 11 ms in tripped position) and vibration per IEC 60068-2-27: 1–6 Hz at 15 mm amplitude, 6–500 Hz at 20 m/s², 10 cycles. Storage and transport range is -40 to +80 °C — the relay can sit in an unheated warehouse or truck without issue.","metaTitle":"Siemens 3RB2066-1GC2 SIRIUS solid-state overload relay","metaDescription":"Siemens 3RB2066-1GC2 SIRIUS solid-state overload relay, 250 A rated operational current, Class 10E trip. Active production. Quoted to order against BOM.","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":"3RB2066-1GC2","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: 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":"$146.05","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7c21ebc0bdadff12a3aa1d350606bb67.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=188721&mlfb=3RB2066-1GC2"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RB2066-1GC2?","answer":"Submit an RFQ against your BOM quantity. Pricing and lead time are confirmed at quote time through authorized distribution channels. No stock-holding claim is made here; availability is verified per request."},{"question":"What is 3RB2066-1GC2's listed note (for message 'tripped')?","answer":"The note indicates the auxiliary switch position 97/98 signals the 'tripped' state of the overload relay. This is the normally-open signaling contact that closes when the relay trips."},{"question":"What compliance documentation does Siemens provide for 3RB2066-1GC2?","answer":"RoHS compliance is confirmed with a substance prohibition date of 07/01/2006, covering EU RoHS requirements. The relay is designed per IEC standards (IEC 60068-2-27 for shock/vibration)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2066-1GC2","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/3RB2066-1GC2 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}}