CDC17 series AC contactor is designed for long-distance making and breaking in circuit, and frequently starting and controlling AC motors in power system with frequency 50/60Hz, rated insulation voltage up to 690V and rated operating voltage to 380V in category AC-3.

It also can be assembled with CDR7 or other thermal relay or electrical protection apparatus, as electron magnetic starter, to protect circuit against overload or phase breaking. It can also be used in the circuit with rated operating voltage of 660V when lowering adequate current.