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What is the difference between the LK4MU3 and LK3MU3?

Issue:
Checking on the difference between an LK4MU3 and LK3MU3.

Product Line:
LK3, LK4 Disconnect Switches

Environment:
Operating Mechanisms and Disconnect Switches

Resolution:
LK4MU3 is the updated version of LK3MU3.

Released for: Schneider Electric USA
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