UL 1066 | UL Standards & Engagement

Standard for Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures

UL CSDS Proposal Published Date: February 08, 2013 Last Revision: March 22, 2017

Scope

010660-000000-000000

1 Scope

1.1 These requirements apply to low-voltage AC power circuit breakers as follows:

a) Stationary-mounted or drawout-mounted types,
b) 2-pole, 3-pole, and 4-pole constructions,
c) Manually operated or power operated, and
d) With or without electromechanical or solid-state type trip device.

1.2 These requirements apply to drawout-mounted type low-voltage AC integrally fused power circuit breakers, consisting of low-voltage AC power circuit breakers with integral fuses.

1.3 These requirements apply to low-voltage AC fuse draw-outs consisting of fuses in a drawout assembly intended to be connected in series with a low-voltage AC power circuit breaker to form a fused circuit breaker.

1.4 These requirements apply to general purpose type DC power circuit breakers.

1.5 These requirements apply to equipment rated 1000 V or less nominal, 1058 V maximum AC and 1500 V maximum DC.

1.6 These requirements apply to equipment intended for use in ordinary locations in accordance with Annex A, Ref. No. 1.

1.7 These requirements are intended to supplement and be used in conjunction with the:

a) Standard for Low-Voltage AC Power Circuit Breakers Used In Enclosures, IEEE C37.13 (see Annex A, Ref. No. 7),
b) Standard for DC (3200 V and below) Power Circuit Breakers Used in Enclosures, IEEE C37.14 (see Annex A, Ref. No. 8),
c) Standard for Metal-Enclosed Low-Voltage (1000 Vac and below, 3200 Vdc and below) Power Circuit Breaker Switchgear, IEEE C37.20.1 (see Annex A, Ref. No. 9),
d) Test Procedures for Switchgear – Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSI C37.50 (see Annex A, Ref. No. 10), and
e) Conformance Test Procedures for Switchgear – Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies, ANSI C37.51 (see Annex A, Ref. No. 11).

1.8 This Standard does not apply to molded-case circuit breakers.

1.9 These circuit breakers are intended for installation in circuit breaker enclosures, switchboards (switchgear), panelboards, and the like. Drawout-mounted devices are intended for use with specific adapters or receiving equipment. The acceptability of the combination of a circuit breaker with respect to any overall enclosure will be determined when the complete product is considered.

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Date
March 22, 2017	Redline	Revision
August 02, 2016	Redline	Revision
July 16, 2013		Revision

Date

March 22, 2017

Redline

Revision

August 02, 2016

Redline

Revision

July 16, 2013

Revision

CSDS Proposal CSDS Proposals An electronic document associated with a UL Standard for Safety or Outline of Investigation, and issued by UL to propose: A revision of a single or multiple requirement(s). A complete new edition of an existing Standard or Outline. A new Standard or Outline that has not previously been published. CSDS Proposals provide access to view the proposal and submit comments within UL's Collaborative Standards Development System (CSDS) appropriately. ×
April 08, 2022
July 30, 2021
September 23, 2020
January 20, 2017
October 31, 2016
June 24, 2016
January 22, 2016
November 09, 2015
March 29, 2013
February 08, 2013
February 03, 2012

CSDS Proposal

CSDS Proposals

An electronic document associated with a UL Standard for Safety or Outline of Investigation, and issued by UL to propose:

A revision of a single or multiple requirement(s).
A complete new edition of an existing Standard or Outline.
A new Standard or Outline that has not previously been published.

CSDS Proposals provide access to view the proposal and submit comments within UL's Collaborative Standards Development System (CSDS) appropriately.

April 08, 2022

July 30, 2021

September 23, 2020

January 20, 2017

October 31, 2016

June 24, 2016

January 22, 2016

November 09, 2015

March 29, 2013

February 08, 2013

February 03, 2012

UL LLC - Certification Requirement Decision Learn more about CRDs Certification Requirement Decisions (CRDs) are certification documents developed and owned by UL LLC. Certification Requirement Decisions are not consensus documents.
December 28, 2016

UL LLC - Certification Requirement Decision Learn more about CRDs

Certification Requirement Decisions (CRDs) are certification documents developed and owned by UL LLC. Certification Requirement Decisions are not consensus documents.

December 28, 2016

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Bulletin Bulletins These bulletins are not used in CSDS. These are announcement and report type bulletins. ×	Summary of Topics (SOT)
June 29, 2018	View Summary of Topics m3801_1_20180629_sum.html Subject 3801 (248-1, 275, 489, 489A, 1066, 1077, 1558, 2367, 4248-1) Bulletin Dated: June 29, 2018 Summary of Topics This bulletin announces the availability of the Outline of Investigation for Fault Limiters, UL 3801.
July 24, 2014	View Summary of Topics m0489_12_20140724_sum.html Subject 489 (489A, 1066, 1077) Bulletin Dated: July 24, 2014 SUMMARY OF TOPICS The following topics were discussed at the meeting of the Standards Technical Panel for Molded-Case Circuit Breakers, Molded-Case Switches, and Supplementary Protectors, STP 489: UL 489 1. Addition of Requirements for the Use of 90°C (194°F) Wire with Molded-Case Switches 2. Revision to Requirements for the Calibration Testing for DC Circuit Breakers 3. Revision of Requirements to Reference Supplement SE 4. Clarification of Requirements for Interchangeable Trip Units 5. Addition of Three-Pole Tests to Table 7.5.4 6A. Revision of Requirements for the Temperature Measurement in Clause 7.1.4.1.11 6B. Revision of Requirements for the Temperature Measurement in Clause 7.1.4.1.11 7. Clarification to 7.10.3 8. Addition to Temperature Test Requirements 9. Clarification of Requirements for Series-Connected Circuit Breakers 10. Revisions to Address DC Rated Circuit Breakers 11. Revision of HACR Marking to be Optional 12. Addition of Calibration for Circuit Breakers employing AFCI, GFCI, and EGFP 13. Additional Slash Ratings For Handle Tied Breakers 14. Electronic Trip Circuit Breakers and 100 Percent Calibration at 40°C 15. Revision to Table 7.5.4 Regarding the GFPE Interrupting Operations 16A. UL 1699C, Proposed Standard for System Combination Arc-Fault Circuit Protection 16B. Addition of Unwanted Tripping Tests 17A. Motor Protection Circuit Breakers 17B. Motor Protection Circuit Breakers 18. Clarification on the Use of 3-Pole Breakers for Use in Single-Phase Circuits and Wye Systems 19. Circuit Breaker with Dependent Manual Operation 20. Verbiage to Test the 15A Rating 21. "Degree Sign" Marking Requirement for Wire Type 22. DC Shunt Resistance 23. Clarification of Solid/Stranded Requirement Only Required for 14 - 10 AWG 24. Reliability of Solid State Components in Electronic Trip Units 25. Expanding the Scope of UL 489 to 1000 Vac/1500 Vdc 26. Addition of Requirements for Thermal Memory Retention 27. Addition of Requirements for Self -Protect Function for Electronic Trip Units UL 1077 28. Field Wiring Terminals for Supplementary Protectors 29. Other Protective Type Devices 30. Overvoltage Testing 31. Correction to Figures 21.1 and 25.1 32. Test Conductor Length 33. DC Rated Protectors with Poles Wired in Series 34. UL 489 and Strain Relief Requirements 35. New Requirements for Arc Energy Reduction 36. New Proposed Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures for Use with Photovoltaic (PV) Systems, UL 489B
June 06, 2013	View Summary of Topics m2831_1_20130613_sum.html Subject 2831 (489, 1066, and 1558) Bulletin Dated: June 6, 2013 Summary of Topics This bulletin announces the availability of the Outline of Investigation for US Naval Commercial Off the Shelf (COTS) Three-Pole, Rated Maximum Voltage 4.76, 8.25, and 15kV, AC, Vacuum Circuit Breakers, Drawout Type, without Internal Overcurrent Protection, and Accessories/Components for Use on Non-Nuclear Naval Combatant Ships, UL 2831.
April 26, 2013	View Summary of Topics m1066a_1_20130426_sum.html Subject 1066A (1066) Bulletin Dated: April 26, 2013 Summary of Topics This bulletin announces the availability of the Outline of Investigation for US Naval Commercial Off the Shelf (COTS) Designated Three-Pole Low-Voltage AC Power Circuit Breakers, Drawout-Mounted Type, and Accessories/Functional Components for Use on Non-Nuclear Naval Combatant Ships, UL 1066A
June 01, 2012	View Summary of Topics m0489_11_20120601_sum.html Subject 489 (489A, 1066, 1077) Bulletin Dated: June 1, 2012 SUMMARY OF TOPICS The following topics were discussed at the meeting of the Standards Technical Panel for Molded-Case Circuit Breakers, Molded-Case Switches, and Supplementary Protectors: 1. Update on UL's 489 Ballot Opened 2012-01-06 2. Removal of Parts for Accessory Installation 3. New Requirements for the Use of DC Rated Circuit Breakers and/or Molded Case Switches in NEC Article 690 (Solar Photovoltaic Systems) Installations 4. Revised Requirements to Address Floating Screw Wiring Terminals 5. Optional Marking for Adjustable Trip Circuit Breakers with Ground Fault Element 6. Correction to Testing of 3-Pole Breakers for Use in Single Phase Circuits 7. Revised Requirements for the On/Off Marking 8. Clarification of Overvoltage Test Method - Undervoltage Trip Release 9. Addition of Requirements for Molded-Case Switches to Supplement SB 10. Clarification of Lock-Off and Lock-On Devices 11. Revisions for Table 6.1.6.1.2 12. Addition of Requirements for Class 2 Spacings 13. Revised Requirements for Wire Connectors 14. Revised Requirements for Insulating Materials 15. Addition of EMC Requirements in Supplements SF and SG 16. Update on UL 489B Including the Inclined Plane Tracking Test 17. Update on UL 489C 18. Update on UL 489D 19. Update on UL 1066 20. Editorial Corrections for UL 1077 21. UL 489B Test Samples 22. Neutral Pole 23. Photovoltaic (PV) Systems and UL 489B

Bulletin

Bulletins

These bulletins are not used in CSDS. These are announcement and report type bulletins.

Summary of Topics (SOT)

June 29, 2018

View

Summary of Topics m3801_1_20180629_sum.html

Subject 3801 (248-1, 275, 489, 489A, 1066, 1077, 1558, 2367, 4248-1)

Bulletin Dated: June 29, 2018

Summary of Topics

This bulletin announces the availability of the Outline of Investigation for Fault Limiters, UL 3801.

July 24, 2014

View

Summary of Topics m0489_12_20140724_sum.html

Subject 489 (489A, 1066, 1077)

Bulletin Dated: July 24, 2014

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Molded-Case Circuit Breakers, Molded-Case Switches, and Supplementary Protectors, STP 489:

UL 489

1. Addition of Requirements for the Use of 90°C (194°F) Wire with Molded-Case Switches

2. Revision to Requirements for the Calibration Testing for DC Circuit Breakers

3. Revision of Requirements to Reference Supplement SE

4. Clarification of Requirements for Interchangeable Trip Units

5. Addition of Three-Pole Tests to Table 7.5.4

6A. Revision of Requirements for the Temperature Measurement in Clause 7.1.4.1.11

6B. Revision of Requirements for the Temperature Measurement in Clause 7.1.4.1.11

7. Clarification to 7.10.3

8. Addition to Temperature Test Requirements

9. Clarification of Requirements for Series-Connected Circuit Breakers

10. Revisions to Address DC Rated Circuit Breakers

11. Revision of HACR Marking to be Optional

12. Addition of Calibration for Circuit Breakers employing AFCI, GFCI, and EGFP

13. Additional Slash Ratings For Handle Tied Breakers

14. Electronic Trip Circuit Breakers and 100 Percent Calibration at 40°C

15. Revision to Table 7.5.4 Regarding the GFPE Interrupting Operations

16A. UL 1699C, Proposed Standard for System Combination Arc-Fault Circuit Protection

16B. Addition of Unwanted Tripping Tests

17A. Motor Protection Circuit Breakers

17B. Motor Protection Circuit Breakers

18. Clarification on the Use of 3-Pole Breakers for Use in Single-Phase Circuits and Wye Systems

19. Circuit Breaker with Dependent Manual Operation

20. Verbiage to Test the 15A Rating

21. "Degree Sign" Marking Requirement for Wire Type

22. DC Shunt Resistance

23. Clarification of Solid/Stranded Requirement Only Required for 14 - 10 AWG

24. Reliability of Solid State Components in Electronic Trip Units

25. Expanding the Scope of UL 489 to 1000 Vac/1500 Vdc

26. Addition of Requirements for Thermal Memory Retention

27. Addition of Requirements for Self -Protect Function for Electronic Trip Units

UL 1077

28. Field Wiring Terminals for Supplementary Protectors

29. Other Protective Type Devices

30. Overvoltage Testing

31. Correction to Figures 21.1 and 25.1

32. Test Conductor Length

33. DC Rated Protectors with Poles Wired in Series

34. UL 489 and Strain Relief Requirements

35. New Requirements for Arc Energy Reduction

36. New Proposed Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures for Use with Photovoltaic (PV) Systems, UL 489B

June 06, 2013

View

Summary of Topics m2831_1_20130613_sum.html

Subject 2831 (489, 1066, and 1558)

Bulletin Dated: June 6, 2013

Summary of Topics

This bulletin announces the availability of the Outline of Investigation for US Naval Commercial Off the Shelf (COTS) Three-Pole, Rated Maximum Voltage 4.76, 8.25, and 15kV, AC, Vacuum Circuit Breakers, Drawout Type, without Internal Overcurrent Protection, and Accessories/Components for Use on Non-Nuclear Naval Combatant Ships, UL 2831.

April 26, 2013

View

Summary of Topics m1066a_1_20130426_sum.html

Subject 1066A (1066)

Bulletin Dated: April 26, 2013

Summary of Topics

This bulletin announces the availability of the Outline of Investigation for US Naval Commercial Off the Shelf (COTS) Designated Three-Pole Low-Voltage AC Power Circuit Breakers, Drawout-Mounted Type, and Accessories/Functional Components for Use on Non-Nuclear Naval Combatant Ships, UL 1066A

June 01, 2012

View

Summary of Topics m0489_11_20120601_sum.html

Subject 489 (489A, 1066, 1077)

Bulletin Dated: June 1, 2012

SUMMARY OF TOPICS

The following topics were discussed at the meeting of the Standards Technical Panel for Molded-Case Circuit Breakers, Molded-Case Switches, and Supplementary Protectors:

1. Update on UL's 489 Ballot Opened 2012-01-06

2. Removal of Parts for Accessory Installation

3. New Requirements for the Use of DC Rated Circuit Breakers and/or Molded Case Switches in NEC Article 690 (Solar Photovoltaic Systems) Installations

4. Revised Requirements to Address Floating Screw Wiring Terminals

5. Optional Marking for Adjustable Trip Circuit Breakers with Ground Fault Element

6. Correction to Testing of 3-Pole Breakers for Use in Single Phase Circuits

7. Revised Requirements for the On/Off Marking

8. Clarification of Overvoltage Test Method - Undervoltage Trip Release

9. Addition of Requirements for Molded-Case Switches to Supplement SB

10. Clarification of Lock-Off and Lock-On Devices

11. Revisions for Table 6.1.6.1.2

12. Addition of Requirements for Class 2 Spacings

13. Revised Requirements for Wire Connectors

14. Revised Requirements for Insulating Materials

15. Addition of EMC Requirements in Supplements SF and SG

16. Update on UL 489B Including the Inclined Plane Tracking Test

17. Update on UL 489C

18. Update on UL 489D

19. Update on UL 1066

20. Editorial Corrections for UL 1077

21. UL 489B Test Samples

22. Neutral Pole

23. Photovoltaic (PV) Systems and UL 489B

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Standard	Edition	Title
746B	5	Polymeric Materials - Long Term Property Evaluations
746C	7	Polymeric Materials - Use in Electrical Equipment Evaluations

Standard

Edition

Title

746B

Polymeric Materials - Long Term Property Evaluations

746C

Polymeric Materials - Use in Electrical Equipment Evaluations

Standard	Edition	Title
1066A	2	US Naval Commercial-Off-The-Shelf (COTS) Designated Three-Pole Low Voltage AC Power Circuit Breakers, Drawout-Mounted Type, and Accessories/Functional Components for Use on Non-Nuclear Naval Combatant Ships

Standard

Edition

Title

1066A

US Naval Commercial-Off-The-Shelf (COTS) Designated Three-Pole Low Voltage AC Power Circuit Breakers, Drawout-Mounted Type, and Accessories/Functional Components for Use on Non-Nuclear Naval Combatant Ships

Standard for Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures

Subject 1066

Bulletin Dated: February 8, 2013

SUMMARY OF TOPICS

Revisions and Related Documents

Below is a list of UL Standards referenced in UL 1066

UL 1066 is referenced in the following list of UL Standards

Standard for Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures

1 Scope

Subject 1066

Bulletin Dated: February 8, 2013

SUMMARY OF TOPICS

Revisions and Related Documents

Subject 3801 (248-1, 275, 489, 489A, 1066, 1077, 1558, 2367, 4248-1)

Bulletin Dated: June 29, 2018

Summary of Topics

Subject 489 (489A, 1066, 1077)

Bulletin Dated: July 24, 2014

SUMMARY OF TOPICS

UL 489

UL 1077

Subject 2831 (489, 1066, and 1558)

Bulletin Dated: June 6, 2013

Summary of Topics

Subject 1066A (1066)

Bulletin Dated: April 26, 2013

Summary of Topics

Subject 489 (489A, 1066, 1077)

Bulletin Dated: June 1, 2012

SUMMARY OF TOPICS

Below is a list of UL Standards referenced in UL 1066

UL 1066 is referenced in the following list of UL Standards

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