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QO breaker with extra width; is it SWN or does it have a shunt trip, aux switch, or alarm switch?

Inquiry:
 How can you determine whether a QO breaker with an extra pole space is an SWN version, has a shunt trip, aux switch, or alarm switch?

Product Line:
QO circuit breaker

Resolution:
The "extra pole" on an SWN breaker will have one terminal and a pigtail.  
A shunt trip will have two terminals and a finite resistance value above 100 ohms when the breaker is closed, and infinite in the ON position.  In the tripped position, resistance coud be either.
An aux switch will have two terminals and infinite resistance in one bkr position and zero in the other (open/closed).  
An alarm switch will have two terminals and infinite resistance when the breaker is open or closed, and low resistance when the breaker is tripped.
 
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