2-Pin Power Plug: A 2-pin power plug, as the name suggests, has two pins or two blades. The specific form—blades or pins—varies according to national standards. For example, China uses two flat blades, while Europe uses two round pins.

3-Pin Power Plug: A 3-pin power plug, as the name suggests, has either three pins/blades, or two pins/blades plus an additional grounding pin or hole. Its structure is more complex than that of a 2-pin plug. There are stringent standards regarding the size, diameter, length of the pins, as well as the distance between them, all of which are key considerations.

Multi-Pin Power Plug: Multi-pin power plugs, such as 4-pin or 5-pin variants, are even more complex. Their design is tailored based on the customer’s requirements and the specific equipment they will be used with, taking into account practical application scenarios.