Masterpact NW is Schneider Electric's air circuit breaker series designed for protection, switching and isolation in low voltage power distribution systems. The NW series covers 800A to 6300A ratings with fixed and draw-out configurations and 3-pole or 4-pole options for industrial and infrastructure applications.
The Schneider Electric Masterpact NW08–NW63 Air Circuit Breaker (ACB) is designed for high-current low-voltage power distribution systems, providing reliable protection against overloads and short-circuit faults. With rated current options from 800 A to 6,300 A, the series is suitable for main incoming circuits, feeder protection and busbar applications in industrial and commercial electrical installations. Its electronic protection capabilities, flexible mounting configurations and range of operating accessories make it adaptable to different switchboard designs and power distribution requirements.
Equipped with MicroLogic electronic trip units, the Masterpact NW series provides configurable protection against electrical faults. Depending on the selected trip unit, protection functions include long-time, short-time and instantaneous overcurrent protection, as well as ground-fault protection. Selected configurations also support electrical measurements, monitoring and communication functions for improved power distribution management.
The Masterpact NW08–NW63 series is available in 3-pole and 4-pole configurations, with fixed-mounted and drawout versions to accommodate different switchgear requirements. Drawout models provide connected, test and disconnected positions, facilitating circuit isolation, inspection and maintenance. The stored-energy operating mechanism supports manual or motorized charging, with compatible accessories available for electrical operation and remote control.
Designed for high-capacity electrical distribution networks, Masterpact NW air circuit breakers are commonly used in main distribution panels, power distribution switchboards, generator protection systems and bus-coupler applications. Typical installations include industrial facilities, commercial buildings, infrastructure projects and other electrical systems requiring high-current circuit protection.
The Masterpact NW range includes multiple frame ratings and breaking capacity versions to meet different system requirements. When selecting a suitable model, key parameters include rated current, rated operational voltage, ultimate breaking capacity (Icu), service breaking capacity (Ics), short-time withstand current (Icw), pole configuration and MicroLogic trip unit type. Additional operating and communication accessories can be selected according to the specific installation requirements.
| Parameter | Specification |
| Series | Masterpact NW |
| Rated Current | 800A / 1000A / 1250A / 1600A / 2000A / 2500A / 3200A / 4000A / 5000A / 6300A |
| Poles | 3P / 4P |
| Installation | Fixed / Draw-out |
| Rated Voltage | Up to 690V AC |
| Standard | IEC 60947-2 |
| Model | Rated Current | Poles | Mounting |
| NW08 | 800A | 3P / 4P | Fixed / Draw-out |
| NW10 | 1000A | 3P / 4P | Fixed / Draw-out |
| NW12 | 1250A | 3P / 4P | Fixed / Draw-out |
| NW16 | 1600A | 3P / 4P | Fixed / Draw-out |
| NW20 | 2000A | 3P / 4P | Fixed / Draw-out |
| NW25 | 2500A | 3P / 4P | Fixed / Draw-out |
| NW32 | 3200A | 3P / 4P | Fixed / Draw-out |
| NW40 | 4000A | 3P / 4P | Fixed / Draw-out |
| NW40b | 4000A | 3P / 4P | Fixed / Draw-out |
| NW50 | 5000A | 3P / 4P | Fixed / Draw-out |
| NW63 | 6300A | 3P / 4P | Fixed / Draw-out |
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