Honeywell AT120A1004
20VA Transformer 120/208/240-24V Foot Mounted
  20VA 20VA 40VA 75VA

Honeywell AT120A1004 universal transformer to power 24Vac circuits in heating/cooling systems and general applications that does not exceed the listed ratings. Replaces part number AT120B1010.

Input 120/208/240 Vac
Output 24v, 20 watt (20 va).

The transformer can be mounted in one of three ways:

  • foot mounting
  • plate mounting
  • mounting through outlet box knockout hole.


  • Temperature Rise -20 to 105 Deg F
  • Size 1-7/8 Inch Width x 2-15/16 Inch Depth x 2-7/8 Inch
  • Color-coded lead wires for primary connections and screw terminals for secondary connections
  • Includes fixed 1/4 inch (6mm) male quick-connects or color-coded lead wires for primary and secondary connections
  • Meets NEC Class 2 requirements and Underwriters Laboratories Standard UL 1585
  • Identified Class 2 not wet, Class 3 wet

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