ATO 3 pole AC magnetic contactor is used in 3 phase units. This contactor relay works between power source and high load electrical motor to balance changes in electrical frequency which may come from a power supply.
Tips: Reasons for poor contact of the AC magnetic contactor
Poor contact of the AC contactor will increase the contact resistance between the moving and static contacts, resulting in excessively high temperature of the contact surface, and causing the surface contact to become a point contact, or even non-conduction. The reasons for this failure are: