SY574 porcelain fuse unit 63A,380-500V excellent quality,low factory price easy installation,and safty operation SY574 porcelain fuse unit 1.Material: Porcelain ... ,accessories:copper,iron,aluminium.,iron with zinc or nickle plated,also can be customised.2.63A ... .Other similar items pls refer to the following SY574 porcelain fuse unit