NASN POWER B series rectifier power supply B380/220-120M12 consists of 12pcs power modules and 1pcs monitor. Our B series comes with automatic insulation detection function. A DC earth fault in a rectifier cabinet occurs when a live DC conductor touches a grounded metal part, allowing current to flo

In the era of fixed line telephones, each household's telephone was powered by the telecommunications bureau. Due to the long distance between the telecommunications office and the telephone in the home, in order to ensure a certain service range, the power supply voltage of the central office switc