Intelligent Motor Starting in a Compact FootprintThe S811+N66N3S is part of Eaton's S811+ family of soft starters, engineered to provide smooth, controlled starting and stopping for three-phase motors. The S811+ line is recognized as one of the world's smallest and most compact soft starters, available in five sizes with rated currents from 37 A to 1,000 A . This space-saving design allows easy retrofits into existing motor control centers, reducing the need for costly enclosure modifications .
With a 66 A rating and N-frame size, the S811+N66N3S is specifically designed for three-phase motors in delta (3-lead) configurations, operating across a voltage range of 200–600 V at 47–63 Hz . Its compact dimensions of 6.45 in (depth) × 2.66 in (width) × 7.37 in (height) and weight of 5.8 lb make it ideal for space-constrained installations.
Smooth Starts and Stops for Extended Equipment Life
By preventing abrupt starts and stops, the S811+ soft starter extends the mechanical life of motor-driven applications and reduces maintenance costs for V-belts and gears . The soft stop control provides a smooth transition for stopping, effectively eliminating the "water-hammer" effect that can damage pipes, valves, and pumps in pumping applications .
Key starting and protection features include:
Motor overload protection for continuous operational safety
Current limitation to reduce inrush currents and peak demand charges
KickStart functionality for applications requiring additional starting torque
Comprehensive monitoring including jam protection, stall protection, phase loss, and phase imbalance detection
Adjustable starting torque from 0% to 83% for application flexibility
Built-in Communication and Advanced Monitoring
The S811+N66N3S comes equipped with Modbus RTU communication as a standard feature, enabling seamless integration into automation and control networks . The integrated Digital Interface Module (DIM) features a backlit LCD display with language-neutral icons, providing intuitive access for configuration, diagnostics, and real-time system monitoring .
The advanced protective functions utilize sophisticated algorithms that model motor heating, resulting in fewer nuisance trips and reduced downtime . Additional diagnostic capabilities include fault memory that stores up to 10 fault events.
Rugged Construction and Global Certifications
Built for reliability in demanding industrial environments, the S811+N66N3S operates across a wide temperature range of -30°C to 50°C. It is certified for global compliance, including UL Listed, CSA Certified (including Elevator Duty), CE Marked, and IEC 60947-4-2 . The unit is designed with an internal bypass contactor to simplify installation and reduce heat generation during continuous operation .
Warranty and Support
The S811+N66N3S is backed by Eaton Selling Policy 25-000, offering a one-year warranty from the date of installation or eighteen months from the date of shipment, whichever occurs first .
Applications
The S811+N66N3S is ideal for a wide range of motor control applications, including:
Pumping systems (with a pump control algorithm to prevent water hammer)
Conveyor and material handling systems
HVAC equipment
Compressors and fans
Industrial processing equipment
Retrofits of existing wye-delta or across-the-line starters
Eaton S811+N66N3S Softstart(Cont act us to confirm current prices)
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