The DIN V-2C is a series of devices for releasing transient overvoltages affected in RS 485/ 422 systems. With Insurance of a couple of wires and a 24V nominal voltage. The DIN V-2C extent additionally gives models to the security of signal kind Devicenet, RS 232, 4-20 mama, PROFIBUS PA, Binary indicators, KNX transport, Modbus, PTC. It is suitable for the insurance of instrumentation introduced in RS 485/422 systems. By their tendency, they are profoundly laid open to instigated transient overvoltages (surges) connected with meteorological action.