UL 497A-1990
Secondary protectors for communication circuits

Standard No.

UL 497A-1990

Release Date

1990

Published By

Underwriters Laboratories (UL)

Status

Be replaced 1997-06

Replace By

UL 497A-1996

Latest

UL 497A-2019

UL 497A-1990 history

• 1970 UL 497A-2019
• 2016 UL 497A BULLETIN-2016 UL Standard for Safety Secondary Protectors for Communication Circuits (COMMENTS DUE: February 6@ 2017)
• 2012 UL 497A BULLETIN-2012 UL Standard for Safety Secondary Protectors for Communication Circuits (COMMENTS DUE: December 03@ 2012)
• 2008 UL 497A BULLETIN-2008 UL Standard for Safety Secondary Protectors for Communication Circuits (COMMENTS DUE: August 11@ 2008)
• 2007 UL 497A BULLETIN-2007 UL Standard for Safety Secondary Protectors for Communication Circuits
• 2001 UL 497A-2001 UL Standard for Safety Secondary Protectors for Communications Circuits (Third Edition; Reprint with revisions through and including December 13@ 2012)
• 1996 UL 497A-1996 UL Standard for Safety Secondary Protectors for Communication Circuits (Second Edition; Reprint with Revisions Through and Including January 07@ 1997)
• 1990 UL 497A-1990 Secondary protectors for communication circuits