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How much space does a QO or QOU electrical accessory, such as a 1021 shunt trip require?

Product line :
Circuit breakers

QOU breakers

Electrical accessories require one (1) extra pole space.
For example a three pole breaker with a shunt trip would take 4 spaces.
The 3/4`` wide shunt trip accessory is on the left side of the breaker if the breaker is vertically positioned .

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