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QOU220VH: DescriptionQOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out); File Size1MB，32 Pages; ManufacturerETC2

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QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)

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QOU Miniature Circuit

Breakers and Switches

Unit Mount (Cable-in/Cable-out)

Class 720

Catalog

September

2005

CONTENTS

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page

Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 12

UL Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 17

Circuit Breaker Tripping Characteristics (Trip Curves) . . . . . . . . . . . page 19

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 28

QYU One-Pole 277 Vac Supplementary Protectors. . . . . . . . . . . . . page 30

QOU Miniature Circuit Breakers and Switches

Application Information

APPLICATION INFORMATION

QOU Miniature Circuit Breaker Types

Miniature molded case circuit breakers are intended for use in residential and commercial applications.

They are tested and listed according to UL Standard 489 and CSA Standard C22.2 No. 5-02 for

molded case circuit breakers and enclosures.

QOU miniature circuit breakers are unit-mount (lug/lug) thermal-magnetic circuit breakers which:

•

Provide a means to manually open a circuit.

Automatically open a circuit under overload or short circuit conditions.

Feature common tripping of all poles.

Have a Visi-Trip

trip indicator.

Can be flush-, surface-, or DIN rail-mounted.

Has lugs at both ends (cable-in/cable-out construction)

Operate in any position.

Are fully tested, UL Listed, and CSA certified for reverse connection without restrictive line/load

markings.

Non-automatic Switches

QOU non-automatic switches are intended for use as disconnect devices only. UL Standard 489

requires switches to be protected by a thermal-magnetic circuit breaker (or fuse) of equivalent rating.

QOU switches are UL Listed for use on circuits capable of delivering not more than 10,000 amperes

when protected by an equivalent rated circuit breaker or fuse. QOU switches contain no automatic

tripping mechanisms and do not provide overcurrent protection.

Description

QOU miniature circuit breakers and switches are available for surface-, flush-, or DIN rail mounted

applications in one-, two-, and three-pole constructions. QOU miniature circuit breakers are used for

overcurrent protection and switching on both ac and dc electrical systems. QOU circuit breakers and

switches measure 0.75 in. (19 mm) wide per pole. Two- and three-pole circuit breakers are both

equipped with an internal crossbar for common tripping of all poles. QOU switches are available in

one-pole, 60 ampere and two- and three-pole, 60, 100 and 125 ampere construction.

Cases for QOU miniature circuit breakers and switches are constructed of a glass-reinforced insulating

material that provides high dielectric strength. Current carrying components are isolated from the

handle. The handle position indicates whether the circuit breaker is off, on or tripped.

Applications

One-pole QOU miniature circuit breakers rated 120/240 Vac are UL Listed for use on 120/240 Vac

single-phase, three-wire or 208Y/120 Vac three-phase, four-wire electrical systems.

Two-pole QOU circuit breakers rated 120/240 Vac are UL Listed for use on 120/240 Vac single-phase,

three-wire or 208Y/120 Vac three-phase, four-wire electrical systems. They cannot be used on 240

Vac delta systems. Use QOU-H two-pole circuit breakers rated 240 Vac on 240 Vac delta and 240 Vac

single-phase, two wire systems.

Three-pole QOU circuit breakers rated 240 Vac are UL Listed for use on any system where the maximum

phase-to-phase or phase-to-ground voltage is 240 Vac or less.

For application information on other systems, contact your local field office

09/2005

QOU Miniature Circuit Breakers and Switches

Application Information

Thermal Trip

The thermal trip element of a circuit breaker is a root-mean-squared (rms) current sensing device. The

thermal element, or bimetal, is constructed from metals with dissimilar rates of expansion bonded

together. The thermal element responds to overloads by reacting to the heat generated both by the

current flowing through the circuit breaker and by the heat contribution from ambient conditions. The

bending force of the bimetal causes the circuit breaker to trip (see Figure 1). The deflection of the

bimetal is predictable as a function of current and time. This is the inverse time tripping characteristic of

the thermal element, i.e., the tripping time decreases as the magnitude of the current increases.

Square D calibrates the thermal elements and they are not field-adjustable. The thermal trip elements

are calibrated for 40° C (104° F) ambient temperature, per UL Standard 489 and CSA Standard C22.2

No. 5-02.

07203042

Latch

Circuit Breaker

Contacts

Bimetal

Current Out

Current In

Normal Conditions

Spring

Thermal Trip

Figure 1:

Thermal Tripping

Magnetic Trip

The magnetic (instantaneous) trip element uses an electromagnetic assembly to trip the circuit breaker

instantaneously (with no intentional delay) at or above a predetermined current value. During a short

circuit of sufficient magnitude, the high-level current passing through the conductor rapidly increases

the magnetic field of the electromagnet that attracts the armature. As the armature is drawn toward the

electromagnet, it initiates an unlatching action and opens the circuit breaker contact (see Figure 2).

Latch

07203043

Circuit Breaker

Contacts

Spring

Conductor

Current Out

Armature

Electromagnet

Current In

Normal Conditions

Figure 2:

Magnetic Tripping

Trip Indicator

When the QOU miniature circuit breaker is tripped, the handle assumes a position between ON (I) and

OFF (O) and the red Visi-Trip

indicator (A) appears in a window in the circuit breaker case. Reset the

circuit breaker and Visi-Trip indicator by pushing the handle to OFF and then to ON.

09/2005

QOU Miniature Circuit Breakers and Switches

Application Information

Line and Load Connections

QOU miniature circuit breakers are supplied with two types of lug configuration as standard, depending

on the continuous current rating:

•

10–70 ampere one- and two-pole; reversible lugs

10–60 ampere three-pole; reversible lugs

Other ampere ratings; forward lugs only

The box-type lugs supplied on QOU miniature circuit breakers are UL Listed and CSA certified to

accept solid or stranded, aluminum or copper conductors These lugs are UL Listed to be used with

wire rated at 140° F, 167° F and 194° F (60° C, 75° C and 90° C), sized according to the NEC 176° F

(75° C) temperature rating. See the Accessories section for more information on terminations.

Optional terminations, such as quick connectors, are also available. See the Accessories section for

more information on terminations.

Ring-tongue terminals can be factory ordered using the following catalog number designations:

•

QOU_ _ _3100 (ring-tongue terminal wired from front)

QOUR_ _ _5283 (ring-tongue terminal wired from rear)

Mounting Provisions

QOU miniature circuit breakers are supplied with mounting brackets for both line and load side

support. Mounting brackets are field installable and can be attached to the front or back of the circuit

breaker molded case. See the Accessories section for more information on mounting brackets.

Tapped mounting feet can be ordered using the catalog number designation QOU_ _ _3100.

All QOU miniature circuit breakers also come equipped with slots in the molded case for DIN rail

mounting.

These miniature circuit breakers are designed for use with a standard 35 mm DIN mounting rail

(DIN/EU 50 022, 0.30 x 1.38 in. [7.5 mm x 35 mm]).

Standards

Square D brand QOU miniature circuit breakers are manufactured and tested according to the

following standards:

•

UL Standard 489 (File E84967)

NEMA Standard AB1

Canadian Standards Association CSA C22.2 No. 5-02

IEC 60947-2

UL Standard 489

Canadian Standards Association CSA C22.2 No. 5-02

Square D brand QOU non-automatic switches comply with:

NOTE: Circuit breakers are to be applied by guidelines detailed in the NEC and other applicable

electrical codes.

09/2005

QOU220VH Related Products

	QOU220VH	QOU110	QOU215VH	QOU225VH	QOU230VH	QOU235VH	QOU240VH	QOU245VH	QOU250VH
Description	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)	QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)

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