The HCC Series definite purpose contactors consists of 1 pole, 2 pole, and 3 pole contactors from 30 amperes to 40 amperes. Acting as an on/off switch controlled by thermostats, contactors are designed with consistent silver thickness for increased product life, making them ideal for the demands of a broad range of applications. The 1 and 2 pole models are typically used in residential applications, while the 3 pole contactors are typically used in commercial applications