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What is the difference between the LUB32 and the new LUS32 starter base?

Issue:
Difference between the LUB32 and the new LUS32 starter base

Product Line: 
Contractor and Starter - IEC

Environment:
North American Products

Resolution:
The LUS32 is starter base approved for group motor installations with upstream short circuit protection. The LUB32 is self-protected starter base which is approved for group motor installations or UL508 Type E self-protected combination motor controller.
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