Need a 208V Single Phase breaker. What's the difference between a Square D QOB2301021 and a QOB230?

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Need a 208V Single Phase breaker. What's the difference between a Square D QOB2301021 and a QOB230?
The QOB 2301021 is a two-pole breaker and takes three breaker positions; the QOB is a two-pole breaker and takes two breaker positions.
Is there any difference between the two?
 

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  • Schneider Electric_Square-D-QO-and-QOB-Miniature-Circuit-Breakers_QO2301021.pdf
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  • Schneider Electric_Square-D-QO-and-QOB-Miniature-Circuit-Breakers_QOB230 (1).pdf
    117.4 KB · Views: 5
The three-space breaker is a shunt-trip; it can be tripped by applying a voltage to a coil in it.
 
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