Mars 50304 Control Transformer 40VA 120 240V to 24V

Product Description

The MARS 50304 is a 40VA single-phase control transformer designed to step down line voltage to 24 volts for low-voltage control circuits in HVAC systems. It accepts multiple primary input voltages - 120, 208, or 240 volts - making it adaptable to a wide range of residential and light commercial installations without requiring separate part numbers for each voltage configuration. The closed construction protects internal windings from dust and debris. Connections are made via wire leads, which integrate cleanly into standard control wiring terminations. Licensed HVAC technicians are the primary installers for this component.

This transformer is commonly installed in forced-air heating and cooling systems where a 24-volt control circuit powers thermostats, contactors, relay coils, and other low-voltage components. Its 40VA capacity supports typical residential control loads. The multi-tap primary input allows a single unit to serve job sites with varying available voltages, reducing the need to stock multiple transformer SKUs. It is suited for new installations and service replacements in rooftop units, split systems, air handlers, and furnaces.

Key Features

• 40VA capacity supports standard residential and light commercial low-voltage control loads
• Multi-tap primary accepts 120, 208, or 240 volt input - one part covers multiple voltage configurations
• 24-volt secondary output compatible with standard thermostat and relay control circuits
• Wire lead connections for direct integration into control wiring harnesses
• Closed construction shields windings from contaminants in equipment cabinets

Compatibility

Designed as an OEM-style replacement for 40VA control transformers used in residential and light commercial HVAC systems requiring a 24-volt control circuit with 120, 208, or 240 volt primary input.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all power to the unit before removing the existing transformer or making any wiring connections. Verify that the total connected VA load of the control circuit does not exceed the 40VA rating of this transformer before energizing. Follow applicable NEC requirements for low-voltage control wiring and equipment grounding.