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
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© 2005 Schneider Electric All Rights Reserved
09/2005
QOU Miniature Circuit Breakers and Switches
Application Information
Table 1:
Selection Data
Catalog Number
One-Pole
Rating
120/240 Vac
10K AIR
10 A
15 A
15 A
20A
20 A
25 A
30 A
35 A
40 A
45 A
50 A
60 A
70 A
80 A
90 A
100 A
125 A
QOU110
QOU115*
QOU115HM*
†
QOU120*
QOU120HM*
QOU125*
QOU130*
QOU135*
QOU140*
QOU145*
QOU150*
QOU160*
QOU170*
QOU180
‡
QOU190
‡
QOU1100
‡
—
†
Two-Pole
120/240 Vac
240 Vac
120/240 Vac
22K AIR
—
QOU215H*
—
QOU220H*
—
QOU225H*
QOU230H*
—
—
—
—
—
—
—
—
—
—
QOU200
QOU2000
‡
QOU20001
‡
QOU225VH
QOU230VH
QOU235VH
QOU240VH
QOU245VH
QOU250VH
QOU260VH
—
—
—
—
—
QOU220VH
QOU215VH
Three-Pole
240 Vac
10K AIR
QOU310
QOU315*
—
QOU320*
—
QOU325*
QOU330*
QOU335*
QOU340*
QOU345*
QOU350*
QOU360*
QOU370
‡
QOU380
‡
QOU390
‡
QOU3100
‡
—
QOU300
QOU3000
‡
QOU30001
‡
22K AIR
—
QOU115VH
—
QOU120VH
—
QOU125VH
QOU130VH
QOU135VH
QOU140VH
QOU145VH
QOU150VH
QOU160VH
—
—
—
—
—
10 K AIR
QOU210
QOU215*
—
QOU220*
—
QOU225*
QOU230*
QOU235*
QOU240*
QOU245*
QOU250*
QOU260*
QOU270*
QOU280
‡
QOU290
‡
QOU2100
‡
QOU2125
‡
Terminal
Lug Wire
Size (AWG)
1—#14–#2
Cu or Al
1—#12–#2/0
Cu or Al
Switch—60 Amperes Max.—240 Vac
Switch—100 Amperes Max.—240 Vac
Switch—125 Amperes Max.—240 Vac
1—#14–#2
1—#12–#2/0
* UL Listed as HACR type for use with heating, air conditioning and refrigeration equipment containing motor-group combinations
and marked for use with HACR type circuit breakers.
†
‡
High-magnetic trip circuit breakers. Recommended for applications where high initial inrush current can occur and for individual
dimmer applications.
Available as Series 1 with forward box lugs only. (No optional terminations)
Tripping Mechanisms
A tripping mechanism is an assembly within the circuit breaker molded case that causes the circuit
breaker to open automatically under sustained overload or short circuit conditions.
The tripping mechanisms in two- and three-pole circuit breakers operate such that an overcurrent on
any pole of the circuit breaker will cause all poles of the circuit breaker to open simultaneously.
Thermal and magnetic factory calibration (with current) is performed on each pole of every Square D
circuit breaker.
These mechanisms operate to trip the circuit breaker:
•
•
•
Thermal trip
Magnetic trip
Optional shunt trip accessory (see Accessories, page 12)
The sensing system is an integral part of a thermal-magnetic circuit breaker. The sensing system
continually monitors current flowing through the circuit breaker. It detects abnormal current conditions
and, depending on the magnitude of the current, initiates an inverse-time or an instantaneous tripping
response. This action causes the tripping mechanism to open the circuit breaker contacts and interrupt
current flow. The speed of the tripping process must be controllable and inversely matched to the
severity of the overcurrent. QOU miniature circuit breakers have an over-center toggle mechanism for
quick-make, quick-break action with positive handle indication. The handle assumes a position
between ON (I) and OFF (O) when the circuit breaker has tripped.
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09/2005
© 2005 Schneider Electric All Rights Reserved
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
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.
4
© 2005 Schneider Electric All Rights Reserved
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
CE
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.
5
09/2005
© 2005 Schneider Electric All Rights Reserved
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