Isolation Transformers for the Marine industry. Suitable for 100 Amp shore power systems, UL Listed isolation transformers assure proper wiring conditions on your boat, and greatly minimizes the possibility of stray current from entering the water. Electrical grade silica and resin compounds completely enclose the core and coil to seal out all moisture and air. UL Type 3R enclosure for indoor or outdoor service. Encapsulation eliminates corrosion and insulation deterioration.