BS1363 Plugs - Ivory MK with sping loaded pin sleeves

Ivory bakelite plug by MK with unusual spring loaded pin sleeves. Pictures and text provided by Loz Pavier.


Bakelite MK 13A plug with spring loaded sleeves for live and neutral pins Bakelite MK 13A plug with unusual sleeved pins An over-thought safety piece by MK. On the surface, appears as a deeper Ivory plug.

Underneath, each L & N pin are surrounded by circular pieces of bakelite with springs behind them. This acts as a shutter to the pin by covering the first 5mm as a plug is withdrawn.


Interior of an MK 13A plug with unusual sleeved pins Not so common, as extremely expensive to buy at the time.

This is an early attempt at extra safety, and the terminals are labelled 'Red, Black, Green' indicating this to be pre 1969.

The Video

View this video on Youtube.

This video shows the MK sleeved plug in detail, and compares it to an unsleeved MK plug from the same period.