Heat Controller MARS-50321 Control Transformer 75VA

Product Description

The HEAT CONTROLLER MARS-50321 is a multi-tap primary control transformer rated at 75 VA, designed to step down line voltage to a 24-volt secondary for low-voltage control circuits. It accepts primary voltages of 120, 208, 240, or 480 volts, making it adaptable across a wide range of commercial and residential electrical supply configurations. The transformer features a manual reset, foot-mount design, and UL Class 2 recognition. Color-coded leads or quick-connect terminals simplify wiring during installation. Licensed HVAC technicians and refrigeration mechanics install this part as a power source for control circuit boards in air conditioning, heating, and refrigeration systems.

The MARS-50321 is suited for applications where a reliable 24-volt control power source is required. Its multi-tap primary accommodates 120, 208, 240, and 480-volt supplies, covering single-phase residential systems through light commercial equipment. The foot-mount configuration allows secure panel or chassis mounting. The manual reset provides a means to restore the transformer after an overload condition without replacing the unit, which is useful in systems prone to control circuit faults during commissioning or maintenance.

Key Features

• Multi-tap primary: 120, 208, 240, and 480 volts for broad system compatibility
• 24-volt secondary output for standard low-voltage control circuits
• 75 VA rating supports typical HVAC and refrigeration control loads
• Manual reset allows restoration after overload without part replacement
• UL Class 2 recognized construction with low heat rise design
• Foot-mount base for secure chassis or panel installation
• Color-coded leads or quick-connect terminals for simplified field wiring

Compatibility

Designed as an OEM-style replacement or upgrade transformer for air conditioning, heating, and refrigeration control circuits requiring a 24-volt secondary and a multi-tap 120 to 480-volt primary supply.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified electrician. Disconnect and lock out all primary power before handling or wiring the transformer. Verify that the correct primary tap is selected to match the supply voltage before energizing. Wiring must comply with the National Electrical Code (NEC) and any applicable local codes for low-voltage control circuit installations.

Technical Specifications

• VA Rating: 75 VA
• Primary Voltage: 120 / 208 / 240 / 480 volts
• Secondary Voltage: 24 volts
• Mount Type: Foot Mount
• Reset Type: Manual Reset
• Certification: UL Class 2 Recognized

Standard Information

• Brand: HEAT CONTROLLER
• Manufacturer Part Number: MARS-50321