French to English Tech/Engineering Electronics / Elect Eng Electricity supply for industrial machining equipment

From a technical specification for machining equipment, in a section giving the electrical requirements:

"Si l'équipement comprend un transformateur, le secondaire est câblé en schéma TN. Les transformateurs monophasés seront protégés par un disjoncteur bipolaire au primaire et uni + neutre au secondaire."

I am not familiar enough with electrical terminology to know what the 'secondaire' and 'primaire' being referred to here are. I have found "coil" or "supply" online as possibilities. Can anybody confirm/improve on my draft translation (even other parts of it if necessary!)?

Draft:
If the equipment has a transformer, the secondary coil shall be wired with earthing scheme TN. The single-phase transformers shall be protected by a two-pole circuit breaker for the primary coil and a single-pole circuit breaker + neutral for the secondary coil.

Thanks :-)