Mars® definite purpose contactors are designed for use on refrigeration, air conditioning, and electric heating systems. They are available in one pole with shunt (one and one half pole) configurations, from 30 thru 40 A. Mars® brand definite purpose contactors are also available in 2-pole models (30 and 40 A) and 3-pole models (30 through 75 A). The universal mounting base allows replacement of most contactor brands. Straight-thru wiring and small size speeds installation.