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QOU245

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

Unspecified 

09/2005

QOU Miniature Circuit Breakers and Switches

Application Information

Table 1: Selection Data

Catalog Number

Rating

One-Pole

120/240 Vac

10K AIR

22K AIR

Two-Pole

120/240 Vac 240 Vac

10 K AIR

120/240 Vac

22K AIR

Three-Pole

240 Vac

10K AIR

Terminal

Lug Wire

Size (AWG)

10 A

QOU110

—

QOU210

—

QOU310

15 A

15 A

QOU115*

QOU115HM*†

QOU115VH

—

QOU215*

—

QOU215H*

—

QOU215VH

QOU315*

—

20A

20 A

QOU120*

QOU120HM*†

QOU120VH

—

QOU220*

—

QOU220H*

—

QOU220VH

QOU320*

—

25 A

QOU125*

QOU125VH

QOU225*

QOU225H* QOU225VH

QOU325* 1—#14–#2

30 A

QOU130*

QOU130VH

QOU230*

QOU230H* QOU230VH

QOU330* Cu or Al

35 A

QOU135*

QOU135VH

QOU235*

—

QOU235VH

QOU335*

40 A

QOU140*

QOU140VH

QOU240*

—

QOU240VH

QOU340*

45 A

QOU145*

QOU145VH

QOU245*

—

QOU245VH

QOU345*

50 A

QOU150*

QOU150VH

QOU250*

—

QOU250VH

QOU350*

60 A

70 A

80 A

90 A

100 A

125 A

QOU160*

QOU170*

QOU180‡

QOU190‡

QOU1100‡

—

QOU160VH

—

—

—

—

—

QOU260*

QOU270*

QOU280‡

QOU290‡

QOU2100‡

QOU2125‡

—

QOU260VH

QOU360*

—

—

QOU370‡

—

—

QOU380‡

—

—

QOU390‡ 1—#12–#2/0

—

—

QOU3100‡ Cu or Al

—

—

—

Switch—60 Amperes Max.—240 Vac

Switch—100 Amperes Max.—240 Vac

Switch—125 Amperes Max.—240 Vac

QOU200

QOU2000‡

QOU20001‡

QOU300

QOU3000‡

QOU30001‡

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.

3

© 2005 Schneider Electric All Rights Reserved

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