High-Amperage Automatic Transfer for 120/208V Three-Phase Applications
The RTSN800G3 is an 800 Amp Automatic Transfer Switch (ATS) designed to deliver seamless power source transition between utility and generator feeds in commercial and light industrial facilities. Configured for 120/208 Volt, 3-Phase (3P) Wye systems, this switch is ideal for buildings with high-density lighting, HVAC, office equipment, and mixed single-phase/three-phase loads requiring uninterrupted backup power.
Key Specifications:
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Amperage: 800 Amps
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Voltage: 120/208 Volts, 3-Phase (3P), 4-Wire + Ground (Wye configuration)
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Enclosure Type: NEMA 3R (Rainproof, sleet-resistant – suitable for outdoor use)
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Rating: Non-Service Rated (Requires upstream overcurrent protection)
Core Features:
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Fully Automatic Operation: The integrated microprocessor controller continuously monitors utility power. Upon loss, brownout, or phase imbalance, it signals the generator to start, transfers the load to emergency power once stable voltage and frequency are reached, and automatically retransfers to utility when normal power returns, followed by an engine cooldown cycle.
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120/208V 3-Phase Wye Configuration: Supports the most common three-phase voltage in North American commercial buildings. Provides both 208V three-phase for motors and HVAC equipment, and 120V single-phase for lighting, receptacles, and office equipment from a single transfer switch.
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NEMA 3R Outdoor Enclosure: Heavy-gauge galvanized steel cabinet with a durable powder-coated finish. Designed to withstand rain, snow, and sleet, allowing for safe outdoor pad or wall mounting without requiring a separate electrical room.
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Non-Service Rated Design: Economical and space-saving solution for applications where overcurrent protection is already provided by an upstream main circuit breaker or fused disconnect. Contains no internal main breaker.
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High Withstand Rating: Engineered to coordinate with upstream protective devices, safely withstanding available fault currents without damage when properly protected.
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Electrically Operated / Mechanically Held: Mechanically held contacts reduce heat buildup and power consumption, ensuring reliable long-term performance.
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User-Friendly Digital Controller: Features LED status indicators, manual test push-button, programmable weekly generator exercise cycle, fault memory, and event logging.
Typical Applications:
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Office buildings and retail centers
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Restaurants and grocery stores
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Schools and municipal buildings
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Multi-tenant residential (apartment common loads)
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Small data centers and server rooms
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Healthcare clinics and urgent care centers
