(Package of 3 Pieces) Noark Miniature Circuit Breaker (MCB), UL 489, B1H series, 4A rated current, B-curve - 3-poles (3P) - 10kA (480Y/277Vac) interrupting rating - 277Vac/480Vac (Y) rated voltage, box lug connections - DIN rail mounting (35mm width), equivalent to 1000812