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Module A-150 (Dual VCS) contains two separate voltage-controlled switches.
Each switch has a control voltage input, a common Out / Input, and two In / Outputs. The switches are bi-directional: they can work in both directions, so can connect one input to either of two outputs, or either of two inputs to one output. Voltages in the range -8V…+8V at the O/I resp. I/O sockets can be processed by the module.
Two LEDs show which in / output is active (i.e. which is connected to the common out / input).