Two-Pole Contactor
Two-pole contactors are used on services that require
lighting controls. On Type A and C services, the contactor switches
all circuits on and off, and is the same size or larger than the
main breaker. On Type D services, the contactor switches only the
lighting circuit and is the same size or larger than the lighting breaker,
typically 30 amps. Standard contactor sizes are 30, 60, 100, and
200 amps.