Power Con® is a new lockable power plug system (20 A, with premating earth contact) mostly used in professional audio & video, with measuring equipment, computers, lighting systems or for industrial use. The reliable contact & lock which prevents accidental unpluggingis enormously important. Two different non-connecting versions are available for short circuit protection. The blue A version for power in (provides units with voltage from outside) & the grey B version for power out (delivers power to further connectable units, which means central voltage is available from one unit).