Resideo - Honeywell Home AT120A1004 Transformer

The AT120A1004 Transformer from Resideo Honeywell Home delivers reliable power for heating and cooling control systems. It accepts 120/208/240 VAC input and provides a 24 VAC secondary, designed for steady operation at 60 Hz in residential HVAC applications.

With a compact footprint and a 20 VA power rating, it easily handles typical control circuits while maintaining safe temperatures with a -20 to 105°F rise. The durable mounting footprint, metal end bell, and UL/CSA approvals ensure long-term service in harsh environments.

• Primary Voltage: 120/208/240 VAC
• Secondary Voltage: 24 VAC
• Power Rating: 20 VA
• Frequency: 60 Hz
• Temperature Rise: -20 to 105°F
• Dimensions: 1-7/8 in W x 2-15/16 in D x 2-7/8 in H
• Mounting: Foot; Includes metal end bell
• Approvals: UL, CSA
• Application: Heating/Cooling Control System