2-pin power plug: As the name suggests, a 2-pin power plug refers to a plug with two blades or two pins. The specific blades or pins vary according to different national standards. For example, the Chinese standard has two blades, while the European standard has two round pins.

3-pin power plug: As the name suggests, a 3-pin power plug refers to a plug with three blades or three pins, or two blades or two pins plus a grounding hole. This structure is more complex than a 2-pin power plug, and there are significant requirements for the size and diameter of the pins, as well as the distance between them.

Multi-pin power plugs: This type of multi-pin power plugs is even more complex, including 4-pin and 5-pin power plugs. Depending on customer requirements and the specific equipment they are used in, practical considerations must be taken.