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Tertiary
Tertiary circuit breakers, also known as molded case circuit breakers (MCCBs) or air circuit breakers (ACBs) in some regions, are essential for protecting electrical distribution systems in commercial and industrial facilities. These devices are designed to handle high fault currents, typically ranging from 100A to 3200A, with breaking capacitie...
Tertiary circuit breakers, also known as molded case circuit breakers (MCCBs) or air circuit breakers (ACBs) in some regions, are essential for protecting electrical distribution systems in commercial and industrial facilities. These devices are designed to handle high fault currents, typically ranging from 100A to 3200A, with breaking capacities up to 200kA at 480V AC. They feature adjustable thermal and magnetic trip units, allowing precise coordination with downstream protection. Available in 3-pole (3P) and 4-pole (4P) configurations, tertiary breakers support fixed, plug-in, or draw-out mounting for easy maintenance. Key technical parameters include rated operational voltage (up to 690V AC), rated insulation voltage (1000V), and frequency (50/60 Hz). Accessories like shunt trips, undervoltage releases, and auxiliary contacts enhance functionality in complex automation systems.
Tertiary circuit breakers are deployed in main distribution boards (MDBs), sub-distribution panels, and motor control centers (MCCs) across sectors such as manufacturing, data centers, hospitals, and renewable energy plants. They are critical for feeder protection in power distribution networks, ensuring selective coordination to minimize downtime. In industrial automation, these breakers safeguard variable frequency drives (VFDs), soft starters, and PLC power supplies. Their robust construction meets IP20 to IP54 protection ratings, suitable for indoor and outdoor installations.
Key subcategories include fixed-type MCCBs (e.g., series NZM, Tmax, or Compact NSX) and draw-out ACBs (e.g., series Emax or Masterpact). Article codes often follow patterns like 'NZM3-400-S' (where 'NZM' denotes series, '3' indicates frame size, '400' is rated current in amps, and 'S' for standard breaking capacity) or 'Tmax T5L 630' (where 'T5L' is frame type and '630' is current rating). Other common codes include 'NSX250F' (250A frame, F for standard breaking) and 'Emax E2N 1600' (1600A frame, N for normal breaking). These codes help identify key specs like number of poles, trip unit type (thermal-magnetic or electronic), and accessories.
Partnering with Electric Automation Network ensures access to genuine tertiary breakers at competitive prices with up to 65% discount. Our engineers provide personalized technical support for selection, coordination studies, and installation guidance. We offer real-time pricing, detailed documentation including time-current curves, and express worldwide shipping. Whether you need a single unit for a retrofit or bulk supply for a new project, our logistics network delivers reliably.
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