the HH83XB405 is rated for both 50/60 Hz frequencies

for high-fire operation

Universal compatibility with Schneider Electric (Barber Colman) and other standard compact thermostats

but you should verify your specific unit's wiring schematic to ensure proper low-voltage terminal alignment

the HH84AA020 furnace board serves as the direct replacement for HH84AA020

Trane CTR3027 Contactor 319852-301 the HH83XB405 is rated forThe Trane CTR3027 is a heavy duty, definite purpose 3 pole contactor engineered for demanding HVACR and industrial motor control applications. Operating with a 24V coil, this component is designed to manage high power electrical loads, supporting up to 40 FLA (Full Load Amps). As a direct replacement for CTR2765, the CTR3027 ensures seamless integration into existing 3 phase systems, providing reliable switching for AC compressors, furnace blowers,