Polylux manufactures high-power three-phase dry-type isolation transformers up to 250 kVA (such as the TTW250 series), which step voltages between 600V and 400V. For high-capacity units like a 250 kVA model, the internal transformer core and coils are securely housed inside a standard metal protection enclosure/control box painted with a durable polyester resin finish (typically light gray RAL 7035) to protect against environments and prevent direct contact with electrical components
