Open single-phase safety isolating transformer designed and tested according to norm EN61558-2-6. Separate insulated windings and protected against dust, humidity and corrosion through complete impregnation in heat tempered varnish. For fixed installation in cabinets or switchboards. Industrial transformer designed for low voltage installation in processing industry and switchboards, class I. Even though the transformer is protected against involuntary contact with live parts, it has to be mounted in cover. Uncovered installation prohibited. The transformer must be protected against short circuit and overload with separate fuse arrangement.