Industrial 5CLS70-44R Current Limiting High Voltage Fuse

The 5CLS70-44R is a two-barrel CLS current-limiting fuse from Eaton Bussmann (Cutler-Hammer/Westinghouse) intended for medium-voltage motor-starter protection. It carries a 700 A current rating and is suitable for nominal system voltages up to about 5.5 kV, with an interrupt rating of 50 kA at that voltage. The device’s 4-inch-diameter by 15.9-inch-long housing reflects the common footprint for CLS fuses in 5 kV motor circuits and it is described as a double-barrel, R-rated fuse in the CLS family. As a current-limiting device, the 5CLS70-44R acts quickly to interrupt fault currents, reducing damage to motors and feeders while allowing the short-duration inrush associated with motor start-up. This fuse is designed to be used with medium-voltage motor controllers and other equipment requiring short-circuit protection for individual motor circuits in industrial power distributions; catalog entries reference it under style 140D045G05 with a 5.08–5.5 kV class rating and 50 kAIC capability.