Power Supplies

AT87A, AT140A, AT150A

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AT87A, AT140A, AT150A

Class 2 Control Transformers AT87A, AT140A,  AT150A

Class 2 Control Transformers


The AT87A, AT140A, AT150A Class 2 control transformers are general purpose transformers that provide power to nominal 24 volt AC control circuits. They are typically used in heating and cooling control systems and Building Automation Systems, BAS. They also can be used in any application that does not exceed the load ratings. Each transformer model is UL listed or recognizes and meets NEC Class 2 "not wet" and Class 3 "wet" requirements.


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QtyModelDescriptionIn StockList PriceInternet Price
AT140A1000 40VA TRANS.120V PRIM. FT/PLATE INFO33.3026.64
AT140A1018 40VA TRANS.MULTI-TAP FT/PLATE In Stock33.3026.64
AT140B1206 40VA TRANS. 120V FT.MOUNT INFO26.8121.45
AT150A1007 50VA TRANS. MULTI-TAP FT/PLATE In Stock38.4730.78
AT150B1237 AT150B1237 (HWELL FOOT MTD) INFO50.4040.32
AT150B1252 TRANSFORMER INFO60.0048.00
AT87A1155 480/24V 48VA TRANSFORMER In Stock99.1479.31
AT87A1189 277:24V 48VA TRANSFORMER In Stock90.9772.78
AT88A1005 TRANSFORMER 120V INFO172.00137.60


No accessories found
  • Meets NEC Class 2 "not wet" and Class 3 "wet" transformer requirements
  • Color-coded leads
  • Screw terminal secondary (AT140A, AT150A)
  • Models with multi-tap primary

Primary Voltage:120/208/240 VAC, 480 VAC, 277 VAC

Frequency:60 Hz, 50/60 Hz

Secondary Voltage:24 VAC

VA Rating:40 VA, 50 VA, 48 VA

Wiring Terminations:Primary: 9" (22.8 cm) colored leads; Secondary: screw terminals, 12" (30.5 cm) colored leads

Dimensions:3.12" H x 2.36" W x 3.19" D (7.92 x 6.05 x 8.10 cm), 2.38" H x 2.19" W X 2.8" D (6.05 x 5.55 x 7.11 cm)

Approvals:UL1585, UL5085-3 File #E14881; CSA, NEC Class 2 "not wet", Class 3 "wet", UL File #E14881; CSA, NEC Class 2 "not wet", Class 3 "wet"

Weight:2 lb (0.91 Kg), 1.75 lb (0.79 Kg)

Warranty:1 year