isolating switch, disconnect, disconnecting switch, isolator
a switch intended for isolating an electric circuit from the source of power; it has no interrupting rating and is intended to be operated only after the circuit has been opened by some other means, elektriaparaat, millega lülitatakse sisse ja välja vooluta või nimiväärtusest tunduvalt väiksema vooluga kõrgepingeahela osi