SQUARE D MASTERPACT NT 12 H 3POLE 1200A AIR CIRCUIT BREAKER
SQUARE D (Schneider Electric) Masterpact NT12H is a 3-pole low voltage air circuit breaker, used for main power distribution protection of industrial and marine power systems. This air circuit breaker is equipped with Micrologic electronic trip unit, providing overload, short-circuit and earth fault protection for busbars, generators and large power loads. The air circuit breaker supports fixed or draw-out installation, local manual operation and optional motorized remote closing & tripping function, with measurement and communication functions for power monitoring. The air circuit breaker serves as critical power distribution spare part for power distribution cabinet overhaul, generator switchboard retrofit and marine main electrical panel maintenance.

This NT12H 3P 1200A unit, frame size NT12, rated current 1200A, rated operational voltage up to 690VAC, H version high short-circuit breaking capacity. NT12H complies with IEC60947-2, UL and marine type approval standards, widely applied on land power plants, petrochemical facilities, cargo vessels and offshore platforms for main generator and bus tie protection. NT12H belongs to legacy discontinued Masterpact NT series, new original production stopped, only surplus and reconditioned spare stock available. Draw-out version enables safe isolation and quick replacement without de-energizing the whole switchboard.

As low voltage main switchgear hardware, this SQUARE D Masterpact NT12H ensures selective protection of power system and isolates fault circuits rapidly to prevent wide-range power failure. SQUARE D Masterpact NT series spare parts include NT12H air circuit breakers, Micrologic trip units, motor operators, auxiliary contacts, draw-out chassis and interlock assemblies for power distribution system maintenance. SQUARE D low voltage air circuit breakers are trusted replacement units for legacy industrial and marine main switchboard systems.