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See Chinese contents: GB/T 11918.4-2014 GB/T 11918.4-2014: Plugs, socket-outlets and couplers for industrial purposes -- Part 4: Switched socket-outlets and connectors with or without interlock
This Part of GB/T 11918 defines the technical requirements of plugs, socket-outlets and couplers for industrial purposes with or without interlock, such as protection against electric shock, interlocking, switches and elements, structures, mechanical strength and electric properties.
