Resideo by HoneyWell AT87A1189 Transformer Plate Mount Transformers - 48VA 277/24V

The Resideo by Honeywell AT87A1189 is a 48VA step-down transformer designed to convert 277V primary voltage to 24V secondary voltage for HVAC control systems. This plate-mount (PF-mount) transformer provides reliable power for thermostats, zone controls, and other low-voltage HVAC equipment in commercial and industrial applications.

Key Features:

• 48VA power capacity for adequate control circuit capacity
• Primary voltage: 277V (common in commercial lighting circuits)
• Secondary voltage: 24V AC for standard HVAC controls
• Plate mount design for flexible installation options
• UL recognized transformer construction for safety compliance
• Thermal overload protection prevents damage from overcurrent conditions
• Suitable for use with high-efficiency HVAC systems and zone control panels

This transformer is ideal for commercial buildings where 277V power is readily available from the electrical system, eliminating the need for additional voltage conversion. The 48VA capacity provides sufficient power for typical single-zone HVAC control applications including digital thermostats, damper actuators, and control relays.