SMC plastic box is a new type of switch box, SMC is environmentally friendly material with protection class up to IP66. SMC itself is reinforced with 30% glass fiber to make it a high resistance and mechanical stiffness (IK09) with the effect of weight about 1/3 of metal box. The SMC itself is reinforced with 30% glass fibers to achieve a high electrical resistance and mechanical stiffness (IK09) with the effect of a metal box that weighs about 1/3 as much as a metal box. Compared to metal boxes, this series has Lighter weight, more adaptable to corrosive and humid environments. At the same time, the price is comparable to that of a metal box.