UL-497A Complete Document History
Standard for Secondary Protectors for Communications Circuits

Complete Current Edition:
   3RD EDITION - Standard for Secondary Protectors for Communications Circuit - March 20, 2001
   CHANGE 06/04 - REVISION CHANGE - CODE A - June 14, 2004
   CHANGE 10/08 - REVISION CHANGE - CODE A - Oct. 1, 2008
   CHANGE 12/12 - REVISION CHANGE - CODE A - Dec. 13, 2012
   CHANGE 02/17 - REVISION CHANGE - CODE A - Feb. 10, 2017
   CHANGE 03/17 - REVISION CHANGE - CODE A - March 30, 2017
   CHANGE 10/19 - REVISION CHANGE - CODE A - Oct. 17, 2019

Obsolete Revision Information:
   2ND EDITION - Standard for Secondary Protectors for Communications Circuit - Jan. 30, 1996
   CHANGE 05/92 - Standard for Secondary Protectors for Communications Circuit - May 12, 1992
   CHANGE 09/90 - Standard for Secondary Protectors for Communications Circuit - Sept. 5, 1990
   1ST EDITION - Standard for Secondary Protectors for Communications Circuit - Jan. 15, 1990