Robertshaw 620-402 Transformer

The Robertshaw 620-402 Transformer is a heavy-duty 48VA multi-tap electrical component engineered for maximum installation flexibility in commercial and residential HVACR environments. This multi-voltage control transformer handles primary inputs of 120V, 208V, or 240V AC at 50/60 Hz, making it a versatile service truck staple. Technicians frequently utilize this unit as a 48VA HVAC transformer replacement due to its secondary output versatility, offering 2.5V, 12V, and 24V options to power various low-voltage controls, relays, and circuit boards. Designed for universal mounting, the 620-402 features a robust 4x4 plate, foot, or hub mount configuration to fit tight furnace cabinets or air handler control boxes. This Robertshaw 620 series transformer is UL 1411 recognized and meets NEMA standards for safety and performance. With 8-inch primary and secondary color-coded leads, it ensures straightforward wiring. This low voltage HVAC control transformer includes internal thermal fuse protection to prevent system damage during overcurrent events, providing reliable 24V secondary output infrastructure for modern climate control systems.

• Multi-Tap Input Versatility: Eliminates the need to carry multiple single-voltage units by supporting 120V, 208V, and 240V primary connections.
• Flexible Secondary Outputs: Provides 2.5V, 12V, or 24V taps, allowing for precise control voltage management across different equipment brands.
• Universal Mounting Hardware: Includes foot, hub, and 4x4 plate mounting options to ensure compatibility with over 1,700 furnace and air handler models.
• NEMA Rated Protection: Built-in thermal fuse protection shields the transformer and downstream components from catastrophic electrical failure.

Can I use this transformer to replace a 40VA unit?
Yes. This 48VA rated transformer can safely replace lower VA units (like 40VA) as it provides a higher power threshold for additional accessories like zone dampers or smart thermostats.

What is the purpose of the 2.5V and 12V secondary taps?
While the 24V tap is standard for most HVAC controls, the 2.5V and 12V taps are designed for specific legacy ignition systems or specialized electronic boards that require lower voltage inputs.

Is this transformer suitable for 50Hz electrical systems?
The Robertshaw 620-402 is rated for both 50Hz and 60Hz, making it compatible with a variety of power grids and international equipment specifications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.