Series APT AC Power Transformers

40 VA to 150 VA, Single or Dual Hub, Circuit Breaker, UL Class 2

The SERIES APT AC Power Transformers provide isolated step-down to 24 VAC with models offering VA ratings of 20, 40, 50, 75, 96, or 150 VA’s. These cost efficient transformers are offered in single or dual 1/2" NPT threaded hub mounts with 8-1/2" 18 AWG wire leads, to meet the installation requirements of a variety of building automation and control panel applications in HVAC. All models are UL Class 2 listed.

Product Applications

  • BAS
  • HVAC

Models & Ordering

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Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Model Description Usually Ships* Price Order
Ships: Call for Details
Price: $17.50
AC power transformer, 24 VAC input, 24 VAC isolated output, 20 VA, single hub Call for Details* $17.50 Order
Ships: 10-11 Weeks
Price: $17.00
AC power transformer, 120 VAC input, 24 VAC isolated output, 20 VA, single hub 10-11 Weeks* $17.00 Order


Input Voltage:
See model chart on catalog page.
Input Frequency:
50/60 Hz.
Output Voltage:
See model chart on catalog page.
Output VA Rating:
20, 40, 50, 75, 96, or 150 VA.
Slotted foot mount with single, or dual 1/2" NPT hub.
Current Protection:
See model chart on catalog page.
Electrical Connections:
Models ending in -20: 20" (508 mm) 18 AWG leads; All other models: 8.5" (210 mm) 18 AWG leads.
See model chart on catalog page.
Agency Approvals:
CE, cULus.


  • Single or dual 1/2" NPT
  • Universal supply voltage input
  • With or without integral circuit breaker

Product Literature

Catalog Pages



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