GB/T 19334-2003
低压开关设备和控制设备的尺寸 在成套开关设备和控制设备中作电器机械支承的标准安装轨
Dimension of low-voltage switchgear and controlgear-Standardized mounting on rails for mechanical support of electrical devices in switchgear and controlgear installations
GBT19334-2003, GB19334-2003