Hubbell 4320 is a diode rectifier specifically designed for demanding applications where short circuits on the DC output bus are common, such as scrap lifting magnets or cranes. It eliminates the need for traditional fuses, which can blow due to cut magnet cables, shorted magnets, or crane rail faults. Instead, the 4320 trips its AC input breaker in the event of a DC output bus fault, allowing for easy reset and reduced downtime.