Features 1. The products are combined type, the shell is made of glass-fiber and unsaturated polyester-resin, inner ciruit breaker is our company special explosion-proof element, the shell is safety-increased structure, with the excellent functions of water-proof, dust-proof and impulsion withstanding, because the main components all use enginering plastic, it has the function of strong corrosion-proof. 2. The product uses scientific optimized design, light and compact structure, but there is big space for the users to install and connect, maintain. 3. With the protection of overload, and short-circuit, it can add the protection offleakage according to the demand. 4. Suitable for steel pipe and cable wiring. 5. Suitable for GB3836-2000, IEC60079 standard request.