Industrial Plugs & Sockets Pre-determined optimum contact pressure for high conductivity. Low contact-resistance-low temperature-rise. Infinite plug interchangeability with consistent contact pressure i.e. no difference in contact-pressure with new or old plugs. Non-deteriorating contact carrying surface. Self aligning, self wiping contacts i.e. contacts wipe and align when the plug has been fully inserted. Reliability of silver contacts unaffected in high temperature conditions.Butt-type silver contactsThe interiors of Plugs and sockets are interchangeable and are retained by cir - clips. The easy interchangeability enables many different arrangements to be made up from a minimum stock of components.Interchangeability of interiorsThe earth contact is always in the central position thus eliminating the possibility of inadvertently connecting a live contact to earth. It is also impossible to lodge or wedge bare conductors in the socket to obtain a supply.EarthingThe socket is fitted with a strong spring closed gasketted cover making the unit suitable for outdoor use.Socket coverThe plug cannot be pulled out of the socket by its cable or fall out on its own due to positive bayonet type fitting.