Interruptores De Caja Moldeada Y Encerramientos

Molded-Case Circuit Breakers & Enclosures

27.0-1

September 2011

Molded-Case Circuit
Breakers & Enclosures

Sheet 27 001

CA08104001E

Contents

22

Molded-Case Circuit Breakers & Enclosures
Breaker Type Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.0-2
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 27.0-3
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.1-1
Special Function Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.2-1
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3-1
Circuit Breaker Selection Data . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.4-1
Specifications
See Eaton’s Product Specification Guide, available on CD or on the Web.
CSI Format: . . . . . . . . . . . . . . . . . . . . . . . . . 1995
2010
Section 26 28 11
Molded-Case Circuit Breakers . . . . . . . . Section 16475
Electronic Trip Units . . . . . . . . . . . . . . . . Section 16904
Section 26 28 50Enclosed Circuit Breakers . . . . . . . . . . . Section 16476
Section 26 28 16.11

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Molded-Case Circuit Breakers

For more information, visit: www.eaton.com/consultants

27.0-2 Molded-Case Circuit Breakers & Enclosures
Breaker Type Comparison

September 2011
Sheet 27 002

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Summary ofDifferences Between Low Voltage Power Circuit Breakers,
Insulated-Case Circuit Breakers and Molded-Case Circuit Breakers
There are two main classifications of low voltage circuit
breakers—molded-case circuit breakers and low voltage
power circuit breakers. All UL®, NEMA® and ANSI standards
are for molded-case circuit breakers and low voltage
power circuit breakers.
The industry recognizesthree types of circuit breakers—
molded-case circuit breakers (MCCB), insulated-case circuit
breakers (ICCB) and low voltage power circuit breakers
LVPCB). Insulated-case circuit breakers are designed to
meet the standards for molded-case circuit breakers.

Low voltage power circuit breakers comply with the
following standards:
ANSI Std. C37.16—Preferred Ratings
ANSI Std. C37.17—Trip Devicesfor LVPCB
■ ANSI Std. C37.50—Test Procedures
■ IEEE® Std. C37.13—LVPCB Used in Enclosures
■ UL 1066—LVPCB
■
■

Molded-case circuit breakers and insulated-case circuit
breakers typically comply with the following standards:
UL 489—MCCB
UL 489—Molded-Case Switches (MCS)
■ NEMA AB1—MCCB and MCS
■ NEMA AB3—MCCB Application
■

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■

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Table 27.0-1. Breaker Type Comparison Chart29

Description

LVPCB
(Type Magnum™ DS and Series NRX™)

ICCB
(Type Magnum SB and Series NRX)

MCCB
(QUICKLAG/Series C®/Series G®)

30

Select trip
short-time rating

Selective trip over full range of fault
currents up to interrupting rating
(high short-time ratings)

31

Selective trip over partial range of fault
currents within the interrupting rating
(mediumshort-time ratings). Typically
up to 35 kA

Selective trip over a smaller range of fault
currents within the interrupting rating (low
short-time ratings). Typically 10–13 times
the frame size

Operator type

Types of operators: mechanically
operated and electrically operated
two-step stored energy

Types of operators: mechanically operated
over-center toggle or motor operator

32Types of operators: mechanically
operated and electrically operated
two-step stored energy

Closing speed

5-cycle closing for electrically
operated devices

5-cycle closing for electrically
operated devices

Greater than 5-cycle closing for electrically
operated devices

Mounting

Available in drawout construction
permitting racking to a distinct “test
position” and removal for...