Replacement capacitor for my ceiling fan. 5μF300v
I do not know why hunter has chosen a 300v for one leg when most other CBB61 5 wires are 250v on all three legs.  Inductive surge/kickback on one speed versus the other two is all I can suspect.
I did notice that for hunter fans they sell a two piece unit for replacement listings.  The photo looks like one cap is 300v value and the other is dual 250v.  

hunter replacement