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Moulded Case Circuit Breakers
Moulded Case Circuit Breakers (MCCBs) are essential protective devices in low-voltage electrical distribution systems, designed to safeguard circuits against overloads, short circuits, and earth faults. These robust units feature a molded insulating case that houses the trip mechanism and arc extinguishing chamber, with ratings typically ranging...
Moulded Case Circuit Breakers (MCCBs) are essential protective devices in low-voltage electrical distribution systems, designed to safeguard circuits against overloads, short circuits, and earth faults. These robust units feature a molded insulating case that houses the trip mechanism and arc extinguishing chamber, with ratings typically ranging from 16A to 1600A and breaking capacities up to 200kA at 415V AC. Available in 3-pole (3P) and 4-pole (4P) configurations, MCCBs offer adjustable thermal-magnetic or electronic trip units for precise protection coordination. They support fixed, plug-in, or draw-out mounting styles, with accessories like shunt trips, undervoltage releases, and auxiliary contacts for remote monitoring. In various regions, they are also known as air circuit breakers (ACBs) for higher ratings or simply as molded case switches when used without overcurrent protection.
MCCBs are deployed across industrial, commercial, and residential sectors, primarily within main distribution boards (MDBs), sub-distribution panels, and motor control centers (MCCs). They are critical in power distribution for factories, data centers, hospitals, and high-rise buildings, where reliable overcurrent protection and selective coordination are mandatory. Applications include feeder protection, branch circuit protection, and backup protection for downstream devices like contactors and soft starters. Their compact design allows integration into switchgear assemblies, while electronic trip units enable communication via Modbus or Profibus for smart grid and building management systems.
Key subcategories within this category include fixed MCCBs (e.g., models with thermal-magnetic trip units for standard applications), electronic MCCBs (with adjustable LSI protection curves for selective coordination), and draw-out MCCBs (facilitating easy maintenance without de-energizing the busbar). Common article codes follow patterns like MCCB-3P-250A-36kA or MCCB-4P-630A-65kA, where the number of poles, rated current, and breaking capacity are specified. Leading series include compact designs for 100A to 630A frames and high-performance units for 800A to 1600A frames, often with suffix letters indicating trip unit type (e.g., -T for thermal-magnetic, -E for electronic).
Partnering with Electric Automation Network ensures access to genuine MCCBs from top manufacturers, with real-time pricing and stock visibility. Our engineering team provides tailored support for trip unit selection, coordination studies, and compliance with IEC 60947-2 or UL 489 standards. We offer express worldwide shipping, technical documentation including time-current curves, and after-sales service for commissioning and troubleshooting.
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