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What does the Z1 suffix mean on the end of an ME breaker?

Issue:
What does the Z1 suffix mean on the end of an ME breaker?
 
Product Line:
Legacy Micrologic Series B Breakers
 
Environment:
Breaker Suffixes
 
Cause:
Need to know what the Z1 stands for
 
Resolution:
The Z1 indicated ZSI (zone selective interlocking) capability.
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