The ICM493 is an advanced, single-phase line voltage monitor with a bank of surge arresters for added protection against brownouts, lightning strikes, power outages & recoveries, startup of larger equipment, power grid faults, short circuits and more. Includes a built-in 40A contactor. Housed in a NEMA Rated 3R enclosure for outdoor installations. UL Listed. Installs easily between the service disconnect and the condensing unit. Ideal for Mini-Splits or other valuable, single-phase equipment.