2400 fuse

[Tom and Lisa P]

Does anyone know the voltage rating for the 5.0 A fuse (F2) on the 
2400 power board ?  The fuse is marked :

50 C
5 A

I bought some 5.0 A fuses, but they are physically smaller (63 V DC). 
The Digikey part # for the fuses I bought is 283-2452-1-ND.

thanks,

Mad Dog