1. Multiple circuit protection optimized designing, and make sure the performance of products could exert steadily 2. Overloading, short circuit, temperature protection 3. Electro magnetic compatibility (EMC), it has no infection for other electro- equipment 4. Moment high voltage and anti-lightning strike protection, and it's very safer for using 5. With patent shell, use project PC plastic as shell material, anti-burning and endure high temperature: 120癈 Specifications: 1. Power: 50VA ~ 3kVA 2. Custom sizes 3. Production explain: medical machine, lighting, audio, UPS 4. Insulation: class B (130癈), class F (155癈), class H (180癈