Robertshaw 620-758 Transformer 480 to 24 Volt

Product Description

The ROBERTSHAW 620-758 is a Class II step-down transformer that converts 480 volts AC to 24 volts AC for use in low-voltage HVAC control circuits. Part of the Robertshaw 620 Series, it is designed to power thermostats, contactors, relays, and other 24-volt control components in heating, cooling, and air handling systems. Licensed HVAC technicians install this transformer as an OEM-style replacement or new-installation component when a dedicated 480-volt primary feed is present at the equipment.

The 620-758 is suited for commercial and light-industrial HVAC applications where equipment operates on a 480-volt supply and requires a reliable 24-volt secondary output for the control circuit. Typical install scenarios include rooftop units, air handlers, and packaged systems fed from 480-volt three-phase or single-phase panels. The unit falls within the 620 Series lineup, which spans universal enclosed and single-voltage open-frame configurations to cover a broad range of field and OEM applications.

Key Features

• 480-volt primary to 24-volt AC secondary for low-voltage HVAC control circuits
• Class II rating limits output power for inherent safety in control-circuit applications
• UL 1585 component recognized by Underwriters Laboratories
• Part of the 620 Series, available in enclosed and open-frame configurations

Compatibility

Designed as an OEM-style replacement or new-installation transformer for HVAC systems with a 480-volt primary supply requiring a 24-volt AC control circuit output.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified electrician. De-energize and lock out the 480-volt supply circuit before beginning any wiring work. Verify the primary voltage at the disconnect matches the transformer rating before energizing. Work must comply with applicable NEC requirements for low-voltage control wiring and transformer installation.

Technical Specifications

• Primary Voltage: 480 volts AC
• Secondary Voltage: 24 volts AC
• Class: Class II
• Certification: UL 1585 Component Recognized

Standard Information

• Brand: ROBERTSHAW
• Manufacturer Part Number: 620-758