Resideo - Honeywell Home AT87A1155 Standard Transformer

AT87A1155 Standard Transformer delivers reliable 24V AC control power from a 480V AC primary, making it an ideal choice for residential combustion control systems. With a 24 VAC secondary and a 50/60 Hz rating, this transformer provides steady performance for modern control circuits. Its 48 VA power rating supports typical control loads, while a temperature rise of -20 to 105°F ensures safe operation across environments. The unit comes in a rugged NEMA Type E enclosure for added protection, and its compact footprint (2-7/32" W x 2-15/16" D) with a mounting foot simplifies installation. Approved for UL and CSA, it’s built to meet strict safety standards.

• Primary voltage: 480 VAC
• Secondary voltage: 24 VAC
• Frequency: 50/60 Hz
• Power rating: 48 VA
• Enclosure: NEMA Type E
• Dimensions: 2-7/32" W x 2-15/16" D
• Mounting: Foot included for secure installation
• Applications: Residential combustion control systems
• Approvals: UL, CSA