RTSN600K3 - Automatic Transfer Switch 600 Amps, 277/480 3P, NEMA 3R, Non-Service Rated

The RTSN600K3 is a 600 Amp Automatic Transfer Switch (ATS) engineered to provide reliable automatic source switching between utility and generator power. Designed for 277/480 Volt, 3-Phase (3P) Wye systems, this switch is ideal for mid-sized commercial and industrial facilities requiring uninterrupted power for lighting, HVAC, and process equipment.

Key Specifications:

• Amperage: 600 Amps

• Voltage: 277/480 Volts, 3-Phase (3P), 4-Wire + Ground (Wye configuration)

• Enclosure Type: NEMA 3R (Rainproof, sleet-resistant – suitable for outdoor installation)

• Rating: Non-Service Rated (Requires upstream overcurrent protection)

Core Features:

• Automatic Source Monitoring & Transfer: The microprocessor-based controller continuously monitors utility voltage and frequency. Upon utility failure or unacceptable power quality, it signals the generator to start, transfers the load to emergency power when stable, and automatically retransfers to utility upon restoration, followed by an adjustable engine cooldown cycle.

• 277/480V 3-Phase Wye Configuration: Supports common commercial voltage levels – 480V three-phase for motors, pumps, and heavy equipment, plus 277V single-phase for energy-efficient fluorescent and LED lighting systems.

• NEMA 3R Outdoor Enclosure: Heavy-gauge galvanized steel cabinet with corrosion-resistant finish. Protects internal components from rain, snow, and sleet, allowing for safe outdoor pad or wall mounting without additional shelter.

• Non-Service Rated Design: Cost-effective solution for installations where overcurrent protection is provided by an upstream main breaker or fused disconnect. Contains no integral main circuit breaker.

• High Withstand Rating: Engineered to coordinate with upstream protective devices, capable of withstanding available fault currents without damage when properly protected.

• Electrically Operated / Mechanically Held: Mechanically held contacts eliminate coil heating, reduce power consumption, and ensure positive contact retention.

• Digital Controller Features:

  • LED status indicators (Source 1 Available, Source 2 Available, Load on Source 1/2)

  • Push-button manual test and transfer

  • Programmable generator exercise timer (weekly)

  • Event logging and fault memory

  • Voltage and frequency adjustment settings

Typical Applications:

• Mid-sized office buildings and retail centers

• Schools and municipal facilities

• Water pumping stations

• Wastewater treatment plants

• Agricultural and farming operations

• Telecommunications shelters

• Small manufacturing facilities