Two Hand Operation Consoles The two hand operation control stations are pre-equipped with 3SB3 command devices. These enclosures are gray metal and supplied as standard with actuators and indicators made of metal. Standard fittings for these comsoles are 2 black mushroom pushbuttons with a 40 mm diameter (1NO+1NC) and 1 red emergency stop mushroom pushbutton with a 40mm diameter and with positive latching (2NC).