Eaton Cutler-Hammer 9-1891-3 U is a three-phase, low-voltage circuit breaker rated for 480V, designed to protect three-phase power distribution systems from overcurrent and short circuits. Used in industrial and commercial electrical panels and switchgear, it interrupts fault currents to safeguard motors, transformers, and other equipment in 3-phase circuits. The 9-1891-3 U model identifies this specific breaker within Eaton’s low-voltage lineup for industrial protection needs.
