A chint nm1-250s/4300b molded case circuit breaker (mccb). it's designed to protect electrical circuits from overloads and short circuits. key specifications include:
model: nm1-250s/4300b
rated current (in): 250a
rated voltage (ui): 800v
impulse withstand voltage (uimp): 8kv
frequency (f): 50hz
utilization category: a
rated insulation voltage (ue): 400v/690v
short-circuit breaking capacity (icu/ics): 35ka/17.5ka at 400v, 8ka/4ka at 690v
trip unit: 10 x in
standard: gb/t 14048.2, operating temperature +40°c