An electrical assembly includes a cover assembly, an electrical component such as a circuit breaker and an adapter for mounting the electrical component to the cover assembly. The cover assembly is adapted for mounting directly to a support surface such as a marine hull where the support surface has an opening to receive the electrical component. The electrical component and adapter are received in an opening in the support surface by the cover assembly. The adapter is constructed for coupling to an electrical component and one or more different cover assemblies having different screw hole patterns where the electrical component cannot be coupled directly to the cover assembly.