Belimo LMX120-3 Actuator Els PW 17895 5 pole because it includes

5 pole because it includes a shunt or bus bar on the second leg

As a direct-match OEM York replacement part

Field Serviceability: Features a removable coil and accessible cover for straightforward maintenance and inspection

This board monitors the 24VAC transformer secondary

Belimo LMX120-3 Actuator Els PW 17895 5 pole because it includesThe Belimo LMX120 3 is a non spring return damper actuator designed for reliable on off or floating point control in HVAC systems. Operating on a universal 100 to 240V AC power supply, this direct coupled actuator delivers 45 in lb of torque, making it suitable for small to medium sized dampers or air handling units. It features a brushless DC motor controlled by an Application Specific Integrated Circuit (ASIC), which provides consistent running time