... rapid discrimination from three-phase three-wire and three-phase four-wire false wiring can be realized and corrective steps are ... : 0.1. 3. Voltage input: 30V~560V; Four shift: 60V, 120V, 240V, 480V, automatic gear shift. 4. Current input: built-in current transformer ... : 1mA~12A, automatic gear shift. Clamp meter: 5A, 10A, 20A, 100A, 200A, 500A, 1000A and ...