[David Dawson]

The breaker size depends on the wire size not the motor. Cims draw lots of amps which requires 12 awg or larger wire. Wire of that gauge can use the 40 amp breaker. Window motors use around 21 amps which means it can use smaller wire and breakers. If you wanted to wire every motor with 10 awg wire. There isn't a rule that says you cant use the 40 amp breakers for all the motors!