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

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.

All makes, all models

Customer wants to understand all available options

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