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MCCBs are intended to provide overcurrent protection for conductors and equipment by opening automatically before the current reaches a value and duration that will cause an excessive or dangerous temperature in conductors or conductor insulation.
Additionally, these devices can serve as the main disconnecting means for a control panel. This protection pertains to low level overcurrent and short-circuit current.
Rockwell Automation offers a complete line of Allen Bradley MCCBs. In the MCCB family there are eight frame sizes, from 15A through 3000A, with dual-rayed EN/IEC 60947-2 and UL489 breakers in 3- and 4-pole configurations.
All frame sizes feature full sets of accessories as well as common accessories, which allows reduced inventory and maximum flexibility.
The Bulletin 140G MCCBs are traditionally used for protection of branch and feeder circuit in an industrial control application. In the role of a feeder circuit breaker, the MCCB provides isolation and short-circuit protection for the panel and thermal protection for the feeder wires.
The Bulletin 140G current-limiting moulded case circuit breakers are rated to open in less than half of a cycle under fault conditions. This performance limits the let-through energy, providing enhanced protection for downstream components.
The MCCBs have multiple frame sizes to accommodate your required current ratings and breaking capabilities. These breakers provide protection of circuits against overload, short circuit, and ground fault. They can be combined with the NEMA and IEC motor starters, overload relays and contactors.
Offers 3- and 4-pole version to support worldwide application
Includes high interrupting ratings from 18…100 kA in a compact device
Offers a wide range of operating mechanisms to fit a variety of panel configurations
Provides greater customisation in trip units
Offers a wide range of accessories for global availability
Approved for global application: UL. CSA, CCC and IEC performance interrupting/breaking capacity
Offers current-limiting option (H, J and K frames) that provides half-cycle interrupt to limit let-through energy
A few from the Allen-Bradley Bulletin 140G MCCB Range