Resideo - Honeywell Home AT87A1189 Standard Transformer

AT87A1189 Standard Transformer delivers reliable low-voltage power from a 277V AC supply for residential control systems. It provides a 24V AC secondary and is rated for 50/60 Hz operation, supporting a wide range of ignition and control circuits. With 48 VA of power, this transformer is built for steady performance in compact spaces and is housed in a NEMA Type E enclosure for durability.

Designed for panel or foot mounting, it pairs well with standard residential combustion control systems and carries UL and CSA approvals for safety and compliance.

• Primary voltage: 277 VAC
• Secondary voltage: 24 VAC
• Frequency: 50/60 Hz
• Power rating: 48 VA
• Temperature rise: -20 to 105 °F
• Enclosure: NEMA Type E
• Mounting: Panel/Foot
• Application: Residential combustion control system
• Approvals: UL, CSA
• Size: 2-7/32 in W x 2-15/16 in D