Sensor/Actuator connection terminal blocks PTIO. Designed for space- and time-saving wiring of three-wire initiators and actuators with a terminal width of just 3.5 mm. Despite their narrow width, the connection terminals are easy to use thanks to the plug-in connection, the testing capability at each connection point, and the large, clearly readable labeling options. All terminal blocks are tailored for wiring sensors and actuators, have the same shape, and can therefore be combined with each other. Suitable for wiring sensors and actuators in modern machine and plant control systems. Narrow terminal width of 3.5 mm, plug-in connection, testing device, can be easily labeled.