UL 489A
Standard for Circuit Breakers for Use in Communications Equipment

DETAILS
Edition Number:1SCC Approved:--
Edition Date:2008-10-15DOD Approved: --
Price Code:AANSI Approved: 2018-07-03
Type:ulstd

  • SCOPE

    1 Scope

    1.1 The requirements of this standard cover single pole or multi-pole DC rated circuit breakers intended for use as branch circuit overcurrent and short-circuit protection in communications equipment.

    1.2 All poles of multi-pole circuit breakers covered by this standard operate at the same potential.

    1.3 The requirements of this standard cover devices rated 600 volts DC or less.

    1.4 This standard is intended to be used with the Standard for Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures, UL 489, as the requirements of this standard modify tests described in that standard.

    1.5 Unless otherwise specified, when the term "circuit breaker" is used in this standard, it refers to a circuit breaker intended for use with communications equipment.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Undated References
        • CONSTRUCTION
          • 4 General
          • 5 Spacings
          • 6 Terminals
          • 7 Manual ON/OFF Operation
        • PERFORMANCE
          • 8 General
          • 9 Calibration Test
          • 10 Overload Test
          • 11 Temperature Test
          • 12 Endurance Test
          • 13 Interrupting Test
          • 14 High Ambient Conditioning Test
        • RATINGS
          • 15 General
        • MARKINGS
          • 16 General