5KCP39 HVAC Motors - Likely The Most Common Line of HVAC Motors Used Today
We've seen thousands of condenser fan & direct-drive furnace blower motors w/ model numbers prefixed by 5KCP39
Before we begin - it's important to note that GE no longer makes fractional horsepower single phase HVAC motors, they're now manufactured by Genteq. Genteq is a division of Regal Beloit Corporation (RBC) and RBC also owns Century, Fasco, Leeson, Marathon, and many other brands of motors.
Let's break down the model number. The 5 in the 5KCP39 indicates that the model number belongs to a rotating device - a motor. The KCP in the 5KCP39 indicates that the rotating device is a Permanent-Split Capacitor type of motor. The 39 in the 5KCP39 indicates that the rotating device is a 48 frame motor.
So, what's a Permanent-Split Capacitor motor? The two most common single phase HVAC motors are Shaded-Pole (SP) and Permanent-Split Capacitor (PSC). PSC motors have an attached run capacitor -- which provides greater start-up torque and makes it more efficient than a SP motor. PSC usually have around have the amp draw as a SP motor with matching HP, RPM and input voltage.
What's a 48 frame motor? 48 is a NEMA -- National Electrical Manufacturers Association -- standard. All 48 frame motors have a 1/2" diameter shaft and a 5-1/2" diameter body. It doesn't matter if the motor is a Fasco, Century, Marathon, Genteq, Emerson or any other brand. A 48 frame is a 48 frame.