The Schneider Electric ComPacT NSX Molded Case Circuit Breaker (MCCB) series is designed for low-voltage power distribution and equipment protection, offering rated current options from 16 A to 630 A. Available in multiple frame sizes, breaking capacity levels and trip unit configurations, the series provides protection against overloads and short-circuit faults in electrical distribution systems. With thermal-magnetic and electronic trip units, flexible installation options and a comprehensive range of accessories, ComPacT NSX circuit breakers are suitable for industrial, commercial and infrastructure applications.
Overload and Short-Circuit Protection
The ComPacT NSX series provides configurable circuit protection through thermal-magnetic and electronic trip units. TM-D and TM-G thermal-magnetic trip units offer overload and short-circuit protection, while MA magnetic trip units are designed for specific applications such as motor protection. MicroLogic electronic trip units provide additional protection functions, including adjustable long-time, short-time and instantaneous protection. Selected configurations also support ground-fault and earth-leakage protection, helping meet different electrical system requirements.
Multiple Breaking Capacity Options
The ComPacT NSX range offers different breaking performance levels to accommodate varying short-circuit conditions. Available performance categories include B, F, N, H, S, L, R, HB1 and HB2, with additional options depending on the frame size. These configurations provide different ultimate and service breaking capacities, allowing users to select suitable circuit breakers according to system voltage, prospective fault current and protection coordination requirements.
Flexible Installation and Operating Configurations
Designed for integration into low-voltage switchboards and distribution panels, the ComPacT NSX series is available in 1-pole, 2-pole, 3-pole and 4-pole configurations, depending on the frame size. Fixed, plug-in and withdrawable installation options support different switchboard layouts and maintenance requirements. Operating accessories include direct and extended rotary handles, motor mechanisms, auxiliary contacts, shunt trip releases and undervoltage releases. These options provide flexibility for manual operation, remote control and circuit status indication.
Electrical Monitoring and Communication
Selected ComPacT NSX configurations feature MicroLogic electronic trip units and compatible communication accessories for electrical monitoring and power management. Depending on the selected trip unit and communication modules, functions can include current and power measurements, energy monitoring, alarm management, fault indication and remote circuit breaker status monitoring. Integration with Schneider Electric EcoStruxure Power solutions supports improved visibility and management of low-voltage electrical distribution systems.
Applications
The ComPacT NSX MCCB series is suitable for electrical distribution protection and specific equipment protection in industrial plants, commercial buildings, infrastructure facilities and power distribution installations. Typical applications include:
-
Power Distribution: Main and branch circuit protection in low-voltage distribution panels.
-
Motor Protection: Protection of motor-feeder circuits with compatible trip units.
-
Transformer Protection: Circuit protection for transformer-related distribution systems.
-
Generator Protection: Selected configurations for generator feeder protection.
-
Building Electrical Systems: Protection of lighting, auxiliary power and general electrical circuits.
