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In the Enclosed ATS48 product line, what is the difference between class designations 8638 and 8639?

Issue:
What is the difference between the 8638 and 8639 versions of the enclosed ATS48 series soft starters?

Product Line:
8638 and 8639 style Enclosed ATS48 soft starters.

Environment:
All makes, all models

Cause:
Customer wants to understand all available options

Resolution:
The 8638 version utilizes a fusible disconnect while the 8639 version uses a circuit breaker disconnect.
 
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