NM1250H 125A 4 Pole Molded Case Circuit Breaker with Thermal Magnetic Protection and Breaking Capacity

Model: NM1250H/43102B 125A AC400V number: 710021122711125 Product overview This is a 4pole fixed circuit breaker with thermal magnetic release designed for AC400V systems. It provides overcurrent and shortcircuit interruption with a frame current of 250A and a rated working current of 125A. The breaker delivers a breaking capacity of 50kA and uses front panel wiring for straightforward installation and maintenance. Key benefits Reliable combined protection: Thermal magnetic release gives both overload protection and fast tripping on short circuits, helping protect wiring and connected equipment. interruption capability: 50kA breaking capacity handles large fault currents common in industrial and commercial installations. Compatibility with threephase systems: 4P configuration supports threephase plus neutral applications at AC400V. Installation and maintenance efficiency: Fixed mounting and front panel wiring reduce installation time and make panel access and wiring work easier. Sizing flexibility: 250A frame current with a 125A rated current allows room for selective coordination and downstream protection planning. Important specifications Model: NM1250H/43102B 125A AC400V number: 710021122711125 Number of poles: 4P Frame current: 250A Rated current: 125A Rated voltage: AC400V Breaking capacity: 50kA Release type: thermal magnetic Installation method: Fixed Wiring method: Front panel wiring Typical applications Motor control and protection: Feeder protection for threephase motors and motor starters in manufacturing and processing plants. Distribution and feeder panels: Main or subdistribution board protection in commercial buildings, industrial plants, and utility rooms. Infrastructure and equipment panels: Protection for HVAC systems, pumps, compressors, and other large electrical loads where breaking capacity and reliable tripping are required. What it solves Prevents damage from sustained overloads by providing thermal tripping based on current heating effect. Interrupts fault currents quickly through magnetic tripping to limit downstream damage. Simplifies panel layout and wiring tasks with front panel access and fixed mounting. Selection notes Use in threephase AC400V installations where 125A continuous rated load protection is required. Consider the 250A frame current when planning coordination with upstream or downstream protective devices. This description reflects the listed model and technical specifications for accurate selection and installation.