Westinghouse LB3400F LB-frame molded-case circuit breaker, 3-pole, style 5680D03G08. It carries a 600 VAC / 250 VDC rating and is part of the LB3400F family for three‑phase protection. As a three‑pole device in the LB frame, it's used in industrial power‑distribution panels to protect three‑phase circuits from overcurrent and short circuits.
