RDQ3 Series Automatic Transfer Switch

Overview

The RDQ3 Series CB Class Automatic Transfer Switch is a robust solution designed for applications requiring high fault protection and reliable power source transitions. Engineered with circuit breaker (CB) technology, this switch ensures safe load transfer while providing superior short-circuit protection, ideal for industrial, commercial, and residential systems.

Features

Circuit Breaker Integration:

UL 489-listed circuit breakers (10-200A) for both utility and generator inputs, offering overload protection (1.5x rated current) and short-circuit interruption (10kA at 480V).

CB Class (Type B) rating for fault-current handling, compliant with IEC 60947-6-1 and NEC 705.31 requirements.

Dual-Source Monitoring:

Automatic voltage/frequency sensing (accuracy ±1%), with adjustable transfer thresholds (voltage: 80-110%, frequency: 47-53Hz/57-63Hz).

Manual transfer override with key-lock control, ensuring operator safety during maintenance or testing.

Reliable Load Management:

Sequential load shedding capability (up to 4 load stages), prioritizing critical loads during generator start-up, reducing peak demand by 25%.

Copper bus bars (99.9% purity) with tin plating, minimizing resistance and heat generation at full load.

Installation Flexibility:

Available in floor-mounted or wall-mounted configurations, with detachable terminal blocks for easy wiring (cable entry from top/bottom).

IP30-rated enclosure (NEMA 1) standard, with IP55 upgrade for dusty environments (warehouses, construction sites).

Application

Suited for fault-prone environments, the RDQ3 Series is used in:

Residential Backup Power: Transfers loads between grid and home generators, protecting HVAC systems, refrigerators, and security systems during outages.

Light Industrial Facilities: Powers pumps, compressors, and lighting in workshops, with fault protection compliant with OSHA 1910.304.

Commercial Kitchens: Ensures continuous operation of ovens, refrigeration, and exhaust systems, with NSF 7 Standard compliance for food-grade environments.

Renewable Microgrids: Integrates with solar inverters and battery banks, providing overcurrent protection in off-grid residential and community systems.

FAQ

Q: How does CB Class differ from PC Class switches?

A: CB Class switches include circuit breakers for fault protection, making them suitable for systems with high short-circuit risks, while PC Class focuses on non-interruptible transfer.

Q: Can the circuit breaker be replaced in the field?

A: Yes, plug-in breaker design allows 10-minute replacement without tools, with compatible breakers from Eaton, Schneider, and Siemens.

Q: What is the voltage drop during transfer?

A: ≤5% nominal voltage drop, ensuring stable operation of sensitive electronics (PLCs, variable frequency drives).