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What does the suffix SA mean on an EDB?

What is the SA suffix on E-frame breaker?
Product Line:
Molded Case Circuit Breaker
E-frame molded case circuit breaker
The SA suffix is the shunt trip with Operating voltage is 110-130 Vac.

NOTE: The factory installed shunt trip will take up an additional space. Shunt trip is NOT field installable. 
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