Marley 4520-2028-000 Manual Reset Limit Switch for MUH/HUHAA Unit Heaters

The Marley Engineered Products 4520-2028-000 is a manual reset limit switch accessory designed specifically for MUH and HUHAA series unit heaters. This L330F-rated safety control protects heating equipment by automatically shutting down the system when temperatures exceed safe operating limits.

Key Features:

• Essential safety system that limits temperature or pressure in HVAC systems to safe levels
• L330F temperature rating (330°F trip point)
• Manual reset design requires operator intervention after trip for enhanced safety
• Therm-O-Disc bimetal disc thermostat construction (Model 60T15 330589)
• OEM replacement part for Berko, Marley, and QMark branded equipment

This high-temperature limit switch is a critical safety component that prevents overheating damage to unit heaters and surrounding areas. The manual reset feature ensures that the system is inspected before being returned to service, helping to identify and resolve potential heating system problems before they cause equipment failure.