UL 489
Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures

DETAILS
Edition Number:13SCC Approved:--
Edition Date:2016-10-24DOD Approved: 1985-01-18
Price Code:DANSI Approved: 2016-10-24
Type:ulcsance

  • SCOPE

    1 Scope

    1.1 The requirements of this standard cover molded-case circuit breakers, circuit breaker and ground-fault circuit-interrupters, fused circuit breakers, high-fault protectors, and high-fault modules. These circuit breakers are specifically intended to provide service entrance, feeder, and branch circuit protection in accordance with the National Installation Codes in Annex B, Ref. No.1. This standard also covers instantaneous-trip circuit breakers (circuit interrupters) specifically intended for use as part of a combination motor controller in accordance with the National Installation Codes in Annex B, Ref. No. 1.

    1.2 This standard covers molded-case switches and fused molded-case switches.

    1.3 This standard covers devices rated at 1000 volts ac and 1500 volts dc or less and 6000 amperes or less.

    1.4 The devices referenced in 1.1 and 1.2 are intended for installation in an overall enclosure or as parts of other devices such as panelboards. The acceptability of the combination will be determined when the complete product is investigated.

    1.5 This standard covers circuit-breaker enclosures and accessory devices intended for use with the devices described in 1.1 and 1.2.

    1.6 This standard does not cover low-voltage power circuit breakers covered in Annex B, Ref. No. 3 and Ref. No. 4 or supplementary protectors covered in Annex B, Ref. No. 5.

    1.7 This standard contains supplements covering the requirements for molded-case circuit breakers for:

    a)     Marine Use;

    b)     Naval Use;

    c)     Uninterruptible Power Supply Use;

    d)     Classified Circuit Breakers;

    e)    Software in Programmable Components;

    f)    Additional Tests for Circuit Breakers with Electronic Overcurrent Protection;

    g)    Electromagnetic Compatibility (EMC) – Requirements and Test Methods for Circuit Breakers; and

    h)    Molded-Case Circuit Breakers with Additional Motor Overload Protection.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Definitions
          • 3 Components
          • 4 Units of Measurement
          • 5 Reference Publications
        • MOLDED CASE CIRCUIT BREAKERS
          • 6 Construction
            • 6.1 All types
            • 6.2 Current-limiting circuit breakers
            • 6.3 Instantaneous-trip circuit breakers
            • 6.4 Circuit breaker and ground-fault circuit-interrupters
            • 6.5 Circuit breakers with equipment ground-fault protection
            • 6.6 Integrally fused circuit breakers, high-fault protectors, and high-fault modules
            • 6.7 Adjustable circuit breakers
            • 6.8 Heating, air conditioning, and refrigeration (HACR) circuit breakers
            • 6.9 Remotely-operated circuit breakers
            • 6.10 Switching duty (SWD) rated circuit breakers
            • 6.11 400 Hz rated circuit breakers
            • 6.12 Draw-out circuit breakers
            • 6.13 Series-connected circuit breakers
            • 6.14 Interchangeable-trip circuit breakers
            • 6.15 High-intensity-discharge (HID) type circuit breakers
            • 6.16 Circuit breakers for use with 16 or 18 AWG wire
            • 6.17 4-pole circuit breakers
            • 6.18 Circuit breakers and surge protective devices
            • 6.19 Special purpose not for general use circuit breakers
            • 6.20 Circuit breakers with electronic trip units
          • 7 Tests
            • 7.1 Standard circuit breakers
            • 7.2 Current-limiting circuit breakers
            • 7.3 Instantaneous-trip circuit breakers
            • 7.4 Circuit breaker and ground-fault circuit-interrupters
            • 7.5 Circuit breakers with equipment ground-fault protection
            • 7.6 Integrally fused circuit breakers, high-fault protectors, and high-fault modules
            • 7.7 Adjustable circuit breakers
            • 7.8 Heating, air conditioning, and refrigeration (HACR) circuit breakers
            • 7.9 Remotely-operated circuit breakers
            • 7.10 Switching duty (SWD) rated circuit breakers
            • 7.11 400 Hz rated circuit breakers
            • 7.12 Draw-out circuit breakers
            • 7.13 Series-connected circuit breakers
            • 7.14 Interchangeable-trip circuit breakers
            • 7.15 High-intensity-discharge (HID) type circuit breakers
            • 7.16 Circuit breakers for use with 16 or 18 AWG wire
            • 7.17 4-pole circuit breakers
            • 7.18 Joints with insulators
            • 7.19 Circuit breakers and surge protective devices
            • 7.20 Special purpose not for general use circuit breakers
          • 8 Ratings
          • 9 Markings
            • 9.1 General
            • 9.2 Current-limiting circuit breakers
            • 9.3 Instantaneous-trip circuit breakers
            • 9.4 Circuit breaker and ground-fault circuit-interrupters
            • 9.5 Circuit breakers with equipment ground-fault protection
            • 9.6 Integrally fused circuit breakers and high fault protectors
            • 9.7 Adjustable circuit breakers
            • 9.8 Heating, air conditioning, and refrigeration (HACR) circuit breakers
            • 9.9 Remotely-operated circuit breakers
            • 9.10 Switching duty (SWD) rated circuit breakers
            • 9.11 400 Hz rated circuit breakers
            • 9.12 Draw-out circuit breakers
            • 9.13 Series-connected circuit breakers
            • 9.14 Interchangeable-trip circuit breakers
            • 9.15 High-intensity-discharge (HID) type circuit breakers
            • 9.16 Rating plugs
            • 9.17 Circuit breakers for use with 16 or 18 AWG wire
            • 9.18 4-pole circuit breakers
        • MOLDED CASE SWITCHES
          • 10 Construction
            • 10.1 All types
            • 10.2 Draw-out switches
          • 11 Performance
            • 11.1 General
            • 11.2 Draw-out switches
          • 12 Ratings
          • 13 Markings
        • ACCESSORIES
          • 14 Construction
            • 14.1 General
            • 14.2 Shunt trip release devices
            • 14.3 Undervoltage-trip release devices
            • 14.4 Overvoltage-trip release devices
            • 14.5 Electrical operators
            • 14.6 Alarm and auxiliary switches
            • 14.7 Mechanical interlock
            • 14.8 Lock-off device
            • 14.9 Lock-on device
          • 15 Performance
            • 15.1 General
            • 15.2 Shunt-trip release devices
            • 15.3 Undervoltage-trip release devices
            • 15.4 Overvoltage-trip release devices
            • 15.5 Electrical operators
            • 15.6 Alarm and auxiliary switches
            • 15.7 Mechanical interlock
            • 15.8 Lock-off device
            • 15.9 Lock-on device
          • 16 Ratings
          • 17 Markings
        • ENCLOSURES
          • 18 Construction
            • 18.1 General
            • 18.2 Provision for locking
            • 18.3 Connections to wiring systems
            • 18.4 Ventilation
            • 18.5 External operating mechanism
            • 18.6 Cases – insulating material
            • 18.7 Current-carrying parts
            • 18.8 Spacings
            • 18.9 Equipment grounding terminals
            • 18.10 Enclosures suitable for use as service equipment (not for use in Canada)
            • 18.11 Enclosures suitable for use as service equipment (for use in Canada)
          • 19 Performance (Short-Circuit Current Ratings)
            • 19.1 General
            • 19.2 Sample selection
            • 19.3 Sample preparation
            • 19.4 Line connections
            • 19.5 Load connections
            • 19.6 Meter-mounting equipment
            • 19.7 Short-circuit procedure
            • 19.8 Short-circuit tests
            • 19.9 Interpretation of results
            • 19.10 Dielectric voltage-withstand test
          • 20 Ratings
          • 21 Markings
            • 21.1 General
            • 21.2 Position indication
            • 21.3 Short-circuit current rating
            • 21.4 Terminations
            • 21.5 Environmental-type designations
            • 21.6 Neutral assemblies
            • 21.7 Back-fed hold-down kit
            • 21.8 Service equipment use (not for use in Canada)
            • 21.9 Service equipment use (for use in Canada)
            • 21.10 Ground-fault protection
            • 21.11 Permanence of marking
            • 21.12 Installation instructions for the testing of ground-fault protection of equipment
    • Annex A (Informative)
    • Annex B (Normative)
    • Annex C (Normative)
    • Annex D (Informative)
    • Annex E (For Canada Only – Informative)Note: This Annex is not a mandatory part of this Standard but is written in mandatory language to accommodate its adoption by anyone wishing to do so.
    • Annex F (Informative)
    • SUPPLEMENT SA – MOLDED-CASE CIRCUIT BREAKERS, MOLDED-CASE SWITCHES, AND CIRCUIT-BREAKER ENCLOSURES (MARINE USE) FOR USE UNDER USCG ELECTRICAL SYSTEMS REGULATIONS SUBCHAPTER S (33 CFR, PART 183) AND USCG ELECTRICAL ENGINEERING REGULATIONS SUBCHAPTER J (46 CFR, PARTS 110 – 113)These are not mandatory requirements for Canada. Canadian requirements fall under an alternate jurisdictional authority and should be investigated accordingly
    • SUPPLEMENT SB – MOLDED-CASE CIRCUIT BREAKERS, MOLDED-CASE SWITCHES, AND CIRCUIT-BREAKER ENCLOSURES (NAVAL USE)These are not mandatory requirements for Canada. Canadian requirements fall under an alternate jurisdictional authority and should be investigated accordingly
    • SUPPLEMENT SC – MOLDED-CASE CIRCUIT BREAKERS AND MOLDED-CASE SWITCHES FOR USE WITH BATTERY POWER SUPPLIES
    • SUPPLEMENT SD – CLASSIFIED CIRCUIT BREAKERS FOR USE WITH SPECIFIED PANELBOARDS AS AN ALTERNATE FOR SPECIFIED CIRCUIT BREAKERSThis Classification program is not available in Canada or Mexico
    • SUPPLEMENT SE – MOLDED-CASE CIRCUIT BREAKERS AND MOLDED-CASE SWITCHES WITH SOFTWARE IN PROGRAMMABLE COMPONENTS
    • SUPPLEMENT SF – ADDITIONAL TESTS FOR CIRCUIT BREAKERS WITH ELECTRONIC OVERCURRENT PROTECTION
    • SUPPLEMENT SG – ELECTROMAGNETIC COMPATIBILITY (EMC) – REQUIREMENTS AND TEST METHODS FOR CIRCUIT BREAKERS
    • SUPPLEMENT SH – MOLDED-CASE CIRCUIT BREAKERS WITH ADDITIONAL MOTOR OVERLOAD PROTECTION