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Are the ET1.0 trip units in M frame breakers adjustable or interchangeable?

Is the ET1.0 Trip Unit in Powerpact M frame breakers interchangeable?

Product Line:
Powerpact Breakers

M Frame Breakers

The trip units on the Powerpact M-frame breakers cannot be replaced. They are basic trip units which have instantaneous (inrush) adjustability, but not long time or amperage adjustability.
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