This part specifies the basic size series of subracks and plug-ins with a height of 20mm. This part is applicable to 20mm height sub-boxes and plug-ins for professional use in electric transmission, electric power, communication and instrumentation.
GB/T 3047.3-2003 history
2003GB/T 3047.3-2003 Series of basic dimensions of subracks and plug-in units for vertical increment of 20mm