1. Diecasted A1-alloy shell with moulded-shapement and plastic-sprayed surface; 2. Switch box is explosion-insulating type structure, wiring chamber is increased-safety type structure; 3. General circuit power wire adopts copper bus brow, Branch output end adopts wiring terminal; 4. C45L leakage breaker and indicators light are built in When leakage current reaches the stipulated &#118alue, power will be cut off auto matically; 5. Possessing the guarding function against overload and short; 6. Adopting the module structure, with various loops for freely selecting and compound; 7. Steelpipe and cable wiring. 8. Suitabe for GB3836-2000、IEC60079、GB12476.1-2000、IEC61241 standard request.