The LW4220/2 Voltmeter combines threephase voltage measurement with a switching cam and a universal transfer rotary switch in a single unit. Designed for use in electrical systems that require routine voltage monitoring and circuit switching, this device is rated for up to 20 A and is supplied as one piece. Key benefits Enables monitoring of threephase voltages while providing controlled switching between circuits. Switching cam supports reliable mechanical control of connected paths. Universal transfer rotary switch offers flexible circuit selection without additional hardware. 20 A current rating covers common industrial load requirements. Onepiece construction simplifies handling and installation. Key attributes Model: LW4220/2 Functionality: Voltmeter with threephase voltage measurement Switch mechanism: Switching cam Switch type: Universal transfer rotary switch Current rating: 20 A Packaging: 1 piece Performance: rated for up to 20 A Applications Electrical control panels requiring threephase voltage monitoring and the ability to switch between measurement points or circuits. Industrial automation panels where a compact instrument combines voltmeter functionality with a rotary switch for flexible circuit routing. Laboratory or test bench setups that need simultaneous threephase voltage measurement and straightforward manual switching between points. Notes Use by qualified personnel in accordance with applicable electrical codes and safety standards. The specification highlights the unit's threephase voltage measurement capability, switching cam functionality, universal transfer rotary switch, and 20 A rating.