Johnson Controls Y65F42-0 Transformer

The Johnson Controls Y65F42-0 Transformer is a heavy-duty, foot and plate-mounted solution designed for reliable 24V control circuit power in commercial HVACR applications. Engineered as a direct replacement for the AE-207-277, this 40VA step-down transformer handles high-voltage 277/480V primary inputs, converting them to a stable 24V secondary output. The inclusion of energy limiting type overload protection ensures circuit safety without requiring external fusing. Its versatile mounting configuration includes a 4" x 4" plate mount and a hub for flexible installation in control panels or junction boxes. With 8-inch color-coded primary and secondary leads featuring common male fittings, field wiring is streamlined for rapid deployment. This Class 2 transformer is essential for powering low voltage thermostats, relays, and contactors in industrial environments where multi-tap primary voltage compatibility is required for high-leg power systems.

• High-Voltage Compatibility: Dual-tap primary supports 277V and 480V commercial power configurations.
• Circuit Protection: Integrated inherently limited design prevents damage from short circuits or overloads.
• Standardized Mounting: Includes a 4-inch square plate and hub for secure attachment to standard electrical boxes.
• Field-Ready Leads: Pre-stripped 8-inch primary and secondary wire leads facilitate fast terminal connections.
• Direct OEM Replacement: Seamlessly replaces legacy Johnson Controls AE-207-277 units without modification.

What is the maximum amperage output for the Y65F42-0?
This 40VA transformer provides approximately 1.67 Amps at 24VAC, making it suitable for standard contactor coils and control boards.

Can this transformer be used with 120V or 208/240V systems?
No, the Y65F42-0 is specifically rated for 277/480V primary inputs; utilizing it with lower voltages will result in insufficient secondary output.

Does this unit require an external fuse on the secondary side?
The unit is energy limiting, meaning it is designed to limit output current to safe levels under load, though secondary fusing remains an industry best practice for additional circuit protection.

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.