Automation NotebookCircuit ProtectionIssue 4 – 2005Learning ResourcesNotebook IssueProduct

Molded Case Circuit Breakers For Electrical Protection

AutomationDirect now carries a line of Molded Case Circuit Breakers (MCCBs) that offers UL489 listed performance for branch circuit overcurrent protection and disconnecting means. The circuit breakers’ small size saves panel space, compared to standard breakers or comparable fusible devices. The breakers are manufactured under license from Eaton Electrical, Inc., the manufacturer of Cutler-Hammer products.

Molded Case Circuit Breakers The MCCBs use patented contact conductor designs featuring high-speed “blow-open” action that results in superior performance when high level fault currents produce extraordinary electromechanical forces. They also feature advanced arc extinguishing technology, and a toggle handle that provides three positions (on/off/tripped) along with
visual indicators.

Units available in the MCCB line include the 100A G-Frame, 225A F-Frame, 400A K-Frame and 600A L- Frame. The G-Frame and F-Frame size units are suitable for reverse feed, and the K-Frame and L-Frame breakers include a 3-pole adjustable magnetic trip. All breakers include base mounting hardware for panel mount applications.

A line of accessories is also available for the MCCBs. Flex and standard shaft handles are available to make installing and operating the enclosure mounted MCCBs easy. Also available are multi-wire lug kits to save valuable panel space and wiring time by eliminating terminal blocks. Standard accessories, such as auxiliary contacts, shunt trips, and undervoltage releases are offered on all frame sizes. The line is manufactured in ISO9000 certified facilities.

Click here to learn more about the new line of Molded case circuit breakers

Originally Published: March 1, 2005