When the attraction coil of the AC contactor is energized, the static iron core generates electromagnetic attraction, the armature is attracted, and the connecting rod connected to the armature drives the contact to move, so that the normally closed contact is disconnected and the normally open contact is closed. The two are linked, and the contactor is in a powered state; when the attraction coil is de-energized, the electromagnetic attraction disappears, and the armature is released under the action of the spring, so that the normally closed contact is closed and the normally open contact is disconnected, and the contactor is in a de-energized state.

The AC power supply series adopts advanced high-precision linear amplifier circuit design, which can provide low noise and high stability output. The adjustable phase angle function is suitable for various types of switch current impact tests and debugging rectifiers. The sweep function is used for efficiency tests of various power electronic products, and can capture the voltage and frequency values ​​of the maximum power point. In addition, the dimming and speed regulator simulation functions can perform dimming and speed regulation tests on electric lights and motor products to verify the status of the product when the end user uses the dimming or speed regulator controller to determine whether there are safety hazards; the interference simulation function of the input power can simulate power interruption, surge, notch, specific phase angle opening or closing, AC sine wave amplitude and frequency slow rise and fall characteristics. The products have been widely used in the fields of electronic and electrical industry, lighting, aviation, as well as R&D and quality inspection units and factory production line testing.