Miniature circuit breaker range expanded
A
Rockwell Automation product story
Edited by the Engineeringtalk editorial team
Aug 28, 2007
Bulletin 1489 busbars are offered in three lengths to provide six, twelve or eighteen connection poles, with protective covers available for any unused poles.
Rockwell Automation has extended the Allen-Bradley Bulletin 1489 range of miniature circuit breakers with accessories.
The expanded Bulletin 1489 range now also includes busbars to provide simple and flexible connectivity in control panels.
The busbars are offered in three lengths to provide six, twelve or eighteen connection poles, with protective covers available for any unused poles.
The incoming line terminal allows multi-phase power to be mounted on the same circuit breaker, with the correct spacing requirements fulfilled.
For increased flexibility, as well as standard line terminal connection, the busbars provide the option of ring terminal connections for easy connection of the load.
Connectivity can be readily expanded by joining up to three busbars together using overlap joints, enabling connection of up to 52 circuit breakers on a single-phase busbar, up to 25 on a two-phase busbar and up to 16 on a three-phase busbar.
The standard protective covers for unused connections will also cover overlapped unused connections on expanded busbars.
The expanded ratings of the 1489 miniature circuit breakers cover two additional areas.
Previously, the 25A version carried a 240V AC maximum rating for UL/CSA applications.
The newly manufactured 25A devices now have a maximum voltage rating of 480Y/277V AC.
The DC rating of the 1489 miniature circuit breakers has also been improved.
Previous versions only carried an AC voltage rating.
Newly manufactured devices have a DC rating of 48V DC (one pole) and 96V DC (two poles in series).
These changes represent running changes.
Products carrying the new ratings are marked accordingly, and are manufactured from January 2007.
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