According to Wikipedia:
AC power plugs and sockets are devices that allow electrically operated equipment to be connected to the primary alternating current (AC) power supply in a building. Electrical plugs and sockets differ in voltage and current rating, shape, size and type of connectors. The types used in each country are set by national standards, some of which are listed in the IEC technical report TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in member countries of IEC.[1]
Design features of plugs and sockets have gradually developed to reduce the risk of electric shock and fire. Safety measures may include pin and slot dimensions and layout that permit only proper insertion of plug into socket, and earth pins longer than power pins so the device becomes earthed before power is connected. Electrical insulation of the pin shanks was added to some designs, to reduce live contact exposure when a plug is partially inserted in a socket.
Santek Inc deals with the following plugs and sockets.
Receptacles
Phase inverter
Plugs
Connectors
Receptacle combinations
Industrial Ethernet
Automation
SCHUKO / grounding type receptacles
Switch disconnectors
Cable connection boxes
Accessories / attachments