UL 1066-2012
UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (Fourth Edition; Reprint with Revisions Through and Including March 22@ 2017)

Standard No.

UL 1066-2012

Release Date

2012

Published By

Underwriters Laboratories (UL)

Status

Be replaced 2012-04

Replace By

UL 1066 BULLETIN-2012

Latest

UL 1066-2022

Scope

These requirements cover 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. 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 current limiters or fuses. These requirements apply to low-voltage ac fuse draw-outs consisting of current limiters or 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. These requirements apply to general purpose type low-voltage dc power circuit breakers. These requirements cover equipment intended for use in ordinary locations in accordance with the National Electrical Code@ ANSI/NFPA 70. 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@ b) Standard for Low-Voltage DC Power Circuit Breakers Used In Enclosures@ IEEE C37.14@ c) Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear@ IEEE C37.20.1@ d) Test Procedures for Switchgear ?C Low-Voltage AC Power Circuit Breakers Used In Enclosures@ ANSI C37.50@ and e) Conformance Test Procedures for Switchgear ?C Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies@ ANSI C37.51. These requirements cover equipment rated 1000 V or less nominal@ 1058 V maximum ac and 1500 V maximum dc. This Standard does not apply to molded-case circuit breakers. 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.

UL 1066-2012 history

• 1970 UL 1066-2022 Low-voltage AC and DC power circuit breakers used in enclosures
• 2018 UL 1066 BULLETIN-2018 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures
• 2017 UL 1066 BULLETIN-2017 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (COMMENTS DUE: February 20@ 2017)
• 2016 UL 1066 CRD-2016 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures - Section / Paragraph Reference: 1.7 Subject: Increase voltage limit to 1000Vac and 1500Vdc (Edition 4: April 13@ 2012)
• 2016 UL 1066 BULLETIN-2016 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (COMMENTS DUE: FEBRUARY 22@ 2016)
• 2015 UL 1066 BULLETIN-2015 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (COMMENTS DUE: November 23@ 2015)
• 2014 UL 1066 BULLETIN-2014 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures
• 2013 UL 1066 BULLETIN-2013 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (COMMENTS DUE: April 29@ 2013)
• 2012 UL 1066 BULLETIN-2012 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (COMMENTS DUE: MARCH 19@ 2012)
• 2012 UL 1066-2012 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (Fourth Edition; Reprint with Revisions Through and Including March 22@ 2017)
• 2011 UL 1066 BULLETIN-2011 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (COMMENTS DUE: August 26@ 2011)
• 2009 UL 1066 BULLETIN-2009 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures
• 2007 UL 1066 BULLETIN-2007 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (COMMENTS DUE: November 30@ 2007)
• 2001 UL 1066 BULLETINS-2001 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures
• 1997 UL 1066-1997 UL Standard for Safety Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures (Third Edition; Reprint with Revisions Through and Including October 05@ 2009)
• 1993 UL 1066-1993 Low-voltage AC and DC power circuit breakers used in enclosures