24 volt Transformer MR 50354


142 in stock

    Inventory at our locations
  • South Dallas: 55 in inventory
  • East Dallas: 40 in inventory
  • Tyler: 29 in inventory
  • Arlington: 18 in inventory
SKU: MR 50354 Categories: ,


Part No. MR 50354

Part Purpose:

The transformer converts high voltage (120 volts or 220 volts) to low voltage (24 volts) used by the wall thermostat to turn the furnace and air conditioner on and off as needed.

Furnace Transformer Specifications:

The MARS-2 Control Transformer 50354 is a 40VA transformer that powers 24 Vac circuits in HVAC systems. This is a NEMA transformer (Class II).

This transformer will replace 24 volt transformers on gas or electric furnaces.  Input voltages of 120 volts, 208 volts or 240 volts may be used with this transformer.

Part failure symptoms:

Both the indoor unit and the outdoor unit fail to come on when thermostat is calling for cooling.

Part diagnosis:

Input voltage measures correctly with multimeter but 24 volts is not present on the output. Bring your “transformer” in for free confirmation that it is good/bad or call the U-FIX-IT store nearest you for free assistance with diagnosis.

Part Location:
Transformer is located inside the furnace near the control board.
Part Replaces:

This 40 VA transformer can compare to or replace the following popular control power transformers: Global GT4031F, Jard 4031F, Honeywell AT140A1018, AT40A1121, AT40A1139, AT140B1214, Universal UET105, UET115, Steveco / White Rodgers 90-T40F3, Packard PF42440.

This 24vac 40VA transformer can be used to replace most 24 volt transformers on furnaces.

Part Specifications:

VA: 40VA
Circuit Breaker: No
Primary Voltage: 120/208/240V 50/60Hz
Secondary Voltage: 24V with Wire Leads
Mount: Foot Mount Transformer
Dimensions: 3.5”³ x 2”³ x 2.25”³

Additional information

Weight 1 lbs
Dimensions 3.5 × 2.2 × 2.25 in


There are no reviews yet.

Be the first to review “24 volt Transformer MR 50354”

Your email address will not be published. Required fields are marked *