The Marley Engineered Products 4520-0010-000 Relay is a specialized fan delay relay designed for precise thermal management in electric forced-air heating systems

verify that the set screw is securely tightened against the flat of the motor shaft to prevent slippage

This dual-pole double-throw (DPDT) control operates on 120VAC and is factory-calibrated for 10K Ohm sensitivity

simplifying maintenance and installation in tight mechanical spaces

Aaon R31450 Limit Switch 326058-758 The Marley Engineered Products 4520-0010-000The Aaon R31450 Limit Switch is a critical safety component engineered for precision temperature regulation in industrial HVACR systems. Designed for high performance applications, this L330F limit switch functions as a high limit safety cut out, automatically interrupting the electrical circuit when internal temperatures exceed 330 degrees Fahrenheit. As a genuine Aaon replacement part, the R31450 ensures seamless compatibility and restores system