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QOU245

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

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QOU Miniature Circuit Breakers and Switches

Application Information

Catalog Numbers

Square D brand circuit breakers are ordered by a catalog number that includes the circuit breaker

family, description, number of poles, amperage rating and suffix.

Table 2: Catalog Numbers

Typical Catalog Number:

QO

U

2

30

QO Miniature Circuit Breaker Family

Description

U – Unit Mounted (Lugs on Both Ends)

No. of Poles

1 – 1-pole

2 – 2-pole

3 – 3-pole

Ampere Rating

10–125 Ampere Rating

00 = 60 A, 000 = 100 A, and 0001 - 125 A QOU Switch

Rating

1- and 2-pole

2-pole

3-pole

No Letter-Standard 120/240 Vac Rating VH - 22,000 AIR

No Letter - 240 Vac Rating

VH - 22,000 AIR

H-240 Vac Rating

VH - 22,000 AIR

Suffix

XXX (i.e., 2100) - Indicates Factory-installed Accessory (See page 12)

H

2100

Ratings for QOU Miniature Circuit Breakers

When designing an electrical distribution system, overcurrent protective devices are generally selected

based on performance requirements. Factors influencing this selection include system voltage,

continuous current, interrupting rating and frequency.

QOU circuit breakers are selected by their ratings. A circuit breaker’s rating must meet or exceed the

parameters of the electrical system on which they are used.

Voltage Rating

A circuit breaker can be rated for alternating current (ac) or direct current (dc) or both. The established

voltage rating of a circuit breaker is based on design parameters such as clearance of current carrying

parts and dielectric withstand tests both through air and over surfaces. Voltage ratings indicate the

maximum voltage for the electrical system on which the circuit breaker can be applied.

The circuit breaker must have a voltage rating greater than or equal to the system voltage. When a

circuit breaker clears an overcurrent, it does so in two steps: First, the current sensing system

identifies the overcurrent and releases the tripping mechanism. This results in a parting of the

contacts. Then the circuit breaker must extinguish the voltage arc across the contacts. If the circuit

breaker has the correct voltage rating, it can efficiently extinguish this voltage arc. QOU miniature

circuit breakers are rated in the following UL 489 voltages, as shown in Table 3:

• 120/240 Vac

• 240 Vac

• 48 Vdc

• 60 Vdc

• 277 Vac for QYU, UL 1077 recognized supplementary protector only (not a branch circuit breaker)

6

© 2005 Schneider Electric All Rights Reserved

09/2005

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