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NB Series
NB Series: High-Performance Molded Case Circuit Breakers for Industrial Automation
The NB Series represents a comprehensive range of molded case circuit breakers (MCCBs) designed for rigorous industrial environments. These devices are engineered to provide reliable overcurrent and short-circuit protection across a wide spectrum of applications. K...
NB Series: High-Performance Molded Case Circuit Breakers for Industrial Automation
The NB Series represents a comprehensive range of molded case circuit breakers (MCCBs) designed for rigorous industrial environments. These devices are engineered to provide reliable overcurrent and short-circuit protection across a wide spectrum of applications. Key technical specifications include multiple pole configurations (typically 3P and 4P), rated operational currents from 16A up to 1600A, and high breaking capacities suitable for both service and distribution networks. The series supports various trip units, including thermal-magnetic and electronic versions, allowing precise adjustment of protection curves. Rated operational voltages typically reach 690V AC at 50/60Hz, with some models rated for 1000V DC applications. The compact design facilitates easy integration into switchboards and control panels, while optional accessories like shunt trips, undervoltage releases, and auxiliary contacts enhance functionality.
NB Series circuit breakers are primarily deployed in industrial power distribution systems, motor control centers, and main switchboards. They are ideal for protecting transformers, generators, capacitors, and large motors in sectors such as manufacturing, mining, water treatment, and renewable energy installations. Their robust construction makes them suitable for harsh environments with high ambient temperatures or vibration. In commercial buildings, they serve as main incomers or feeder protection in electrical rooms. The series also finds application in marine and offshore installations where reliability under extreme conditions is critical.
The NB Series includes several subcategories based on frame size and breaking capacity. Key article codes follow a structured naming convention: NB-XXX-YYY, where XXX denotes the frame size (e.g., 100, 250, 630, 1600) and YYY indicates the number of poles and breaking capacity class (e.g., 3P-36kA, 4P-50kA). Common models include NB-100-3P-25kA for light industrial loads, NB-250-4P-36kA for general distribution, NB-630-3P-50kA for heavy machinery, and NB-1600-4P-65kA for main switchboards. Each variant is available with fixed or draw-out mounting options.
At Electric Automation Network, we offer the complete NB Series with real-time pricing and global express shipping. Our team of specialized engineers provides personalized technical support for selection, coordination studies, and integration into existing systems. Each product includes detailed documentation, including dimensional drawings, wiring diagrams, and performance curves. We ensure fast delivery worldwide, minimizing downtime for your critical projects.
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