Mars 50354 Transformer 120/208V to 24V Hvac Control

Product Description

The MARS 50354 is a step-down transformer designed to convert a 120 or 208 volt primary supply to a 24 volt secondary output for low-voltage control circuits. This type of transformer is a standard component in HVAC systems, where 24-volt signals drive thermostats, contactors, relays, and zone valves. The 50354 handles dual primary voltage input, making it adaptable to both standard residential 120-volt circuits and commercial 208-volt supplies. Licensed HVAC technicians and electricians install this unit during system commissioning, control board replacement, or transformer failure diagnosis.

This transformer is suited for residential and light commercial HVAC applications where a reliable 24-volt control circuit is required. Common installation scenarios include gas furnaces, air handlers, heat pumps, and packaged rooftop units that use low-voltage thermostatic control wiring. Its dual primary voltage rating makes it a practical fit across a range of single-phase electrical service configurations without requiring a separate unit for each voltage tier.

Key Features

• Dual primary voltage input: 120 volts or 208 volts
• 24-volt secondary output for low-voltage control circuit applications
• Compatible with standard HVAC thermostatic and relay control wiring
• Compact design suitable for mounting inside air handler cabinets and furnace enclosures
• Single-unit solution for both residential and light commercial voltage supplies

Compatibility

Designed as an OEM-style replacement transformer for residential and light commercial HVAC systems requiring a 120/208 volt primary to 24 volt secondary step-down transformer.

Installation Notes

Installation should be performed by a licensed HVAC technician or electrician. Disconnect and lock out power to the unit before removing or installing the transformer. Verify that the primary voltage at the service panel matches the selected primary tap on the transformer before energizing. Follow applicable NEC requirements for low-voltage wiring and control circuit protection.