The Variable Three Phase AC Power Supply is housed in a totally enclosed, stackable, and portable half-size modular unit. Connections can be made between the three-phase power supply and other components in the circuit through 4mm φ standard color-coded safety sockets using banana plug jumper leads. Specifications and/or diagrams are silk-screened on the back of a clear-plastic front panel for ease of identification. The trainer is protected by a either a diode or thermal-magnetic circuit breaker. Included in the Rotating Machines Trainer (50016) for 1/3 hp - 250 W. Requires a 120V 60Hz circuit.