Honeywell AT88A1047 Transformer

The Honeywell AT88A1047 Transformer is a heavy-duty 75VA power solution designed for demanding HVACR control voltage applications. Engineered for high-voltage commercial environments, this 480V to 24V step-down transformer provides a stable 26.5V secondary output, ensuring reliable performance for sophisticated building automation systems and industrial machinery. As the direct replacement for Honeywell 620-758, it features foot-mounted installation for secure placement within control cabinets. The internally fused secondary provides critical overload protection, preventing damage to downstream components during electrical surges or short circuits. Equipped with 12-inch color-coded leadwires, this technical-grade component facilitates rapid integration into existing circuits. Whether you are servicing rooftop units or complex 480V primary transformer setups, the AT88A1047 offers the thermal stability and 1.5 multiplier inrush capability required for solenoids, contactors, and high-draw control boards in commercial HVAC environments.

• Enhanced Circuit Protection: The built-in internal fuse on the secondary side eliminates the need for external fusing, protecting sensitive control circuits.
• High VA Rating: Rated at 75VA, this unit supports larger contactors and multiple control loads without significant voltage drop.
• Universal Mounting: The robust foot-mount design ensures high vibration resistance in industrial mechanical rooms.
• Simplified Wiring: Pre-stripped 12-inch leadwires save time during field installation and prevent loose terminal connections.
• Strict Voltage Regulation: Maintains a consistent 26.5V secondary output from a 480V primary source to prevent relay chatter.

Is the Honeywell AT88A1047 compatible with 208V or 240V systems?
No, this specific model is designed strictly for a 480V primary input. Applying a lower primary voltage will result in insufficient secondary voltage output.

What does the internal fuse protect against?
The internally fused secondary acts as a fail-safe against overcurrent and short circuits, sacrificial by design to protect your more expensive controller or thermostat.

Can I use this to replace an old 620-758 transformer?
Yes, the AT88A1047 is the manufacturer-specified direct replacement for the 620-758, maintaining the same electrical profile and footprint for a seamless swap.

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.