What distinguishes a Conventional transformer from a CSP transformer?

A Conventional transformer is typically designed to operate with separate components such as cutouts and arrestors for protection and voltage regulation. This design requires additional equipment to be installed and maintained alongside the transformer, emphasizing its reliance on these external components for proper operation. In contrast, a CSP (Compact Single Phase) transformer integrates several of these functionalities, such as protective cutouts and arrestors, directly into its design. This integration often enhances reliability and simplifies installation since the CSP transformer is optimized for efficiency in space and resource usage.

The other options do not accurately highlight the essential distinctions between these transformer types. CSP transformers may not necessarily have a higher voltage rating; it varies based on specific applications. Regarding size, it is not universally correct that Conventional transformers are smaller than CSP transformers, as sizes can vary widely depending on the specific use case and design. Lastly, regarding efficiency, CSP transformers are actually designed to be more compact and efficient, making them suitable for urban and space-constrained installations.