... transformer 1) CE,CCC, ISO 9001- 2008 2) SG-, 50/60HZ 3)import-equipment use 4)low frequency transformer 3 ... ≤ 90% 4.installation sites should not seriously affect the strength of transformer insulating gas, steam, chemical deposition, dirt, dust, and ... Shanghai Leilang Electrical Equipment Manufacturing Co., Ltd. is a collection of scientific research, production, sales, and product maintenance is a ...