What is completely self protected transformer?

(Amorphous Metal/CRGO Silicon Steel) Completely Self-Protected Transformers (CSP)

 offer a complete and safe solution against lightning, switch surges and severe overloads.

What is the difference between CSP and conventional transformers?

CSP, or Completely Self Protected transformers contain several safeguards to avoid issues that

 would cause overloading or damage to the transformer. 

Conventional transformers do not have any of these features which usually means they will need to be attached to a cut out switch.

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