Tina 2A, Tina 3A and Tina 7A are used for connecting safety components with mechanical contacts such as E-stops, switches and light beams/curtains with relay outputs. NB. To obtain safety category 4 and minimise the risk of electrical disturbances Tina 2A, 3A and 7A must be assembled within the same physical enclosure as the safety component being monitored and connected to the Tina unit with the shortest wiring possible.