For Sizes CA7-9...55 Contactors, the answer is NO!

The CA7-9...55 Contactors cannot be converted from an AC - and, it cannot be converted from a DC to an AC coil. This is because the coil armatures used with the AC and DC coils are different.

For Sizes CA7-60...97 Contactors, the answer is YES!

The CA7-60...97 Contactors can be converted from an AC coil to a DC coil (or DC to AC) in the field by ordering the repair coil part numbers listed in Sprecher+Schuh catalog.