Part number A9A26381 is for mounting on the Right side of Circuit breaker.
For further details please follow the below link,
https://www.tracepartsonline.net/(S(jj1xcpflpzf1tyxwjtna0vip))/partdetails.aspx?PartID=10-02112015-105620&class=SCHNEIDER_ELECTRIC_DISTRI&clsid=/SCHNEIDER_DISTRI/F_SCHNEIDER_DISTRI/SCHNEIDER_DISTRI.030/SCHNEIDER_DISTRI.030.010/