Enclosed, safety or separation transformers, intended mainly for mounting on a T-35 rail. Aesthetic housing with a spring-loaded handle significantly facilitates and speeds up mounting. These are made in class II insulation and IP20 protection level (models with N series) or IP30, max. ambient temperature 40°C, insulation thermal class B (130°C). Made according to EN 61558-2-4, EN 61558-2-6.