NE020-030 50 Hz Hazardous Location (J4) User and Technical ManualFor Serial Numbers beginning with XXXXXX through XXXXXXclick below to download the associated manual174004 through 180405180406 through 183603183604 through 184001184002 through 190803190804 through 191404191405 through 192502192503 through 193304193305 through 202302From 202303 to present