Federal Pacific Electric BU33 Magnetic Starter

The Federal Pacific BU33 magnetic starter (Class 4204, Style BU33, Size 3) is a 600V, 50 HP motor starter designed to control three-phase motors in electrical control panels. As a magnetic starter, it energizes a control coil to close and open the main contacts, enabling remote motor start and stop within a BU33/Size 3 footprint. Rated for up to 600 volts and 50 horsepower, it defines the maximum motor load it can safely handle in industrial applications. This BU33 device is part of Federal Pacific's Class 4204 family, aligning with the BU33 size 3 configuration for compatible wiring and panel layouts. It is used in motor control circuits to manage power to three-phase motors, providing straightforward, reliable on/off control in industrial electrical installations.