QOU220 SQUARE D, QOU220 Datasheet - Page 6

• Manufacturer Part Number: QOU220
• Description: CIRCUIT BREAKER, THERMAL MAG, 2P, 20A
• Manufacturer: SQUARE D
• Series: QOUr
• Type: Thermal/Magneticr

Specifications of QOU220

• Actuator Style: Toggle
• No. Of Poles: 2
• Current Rating: 20A
• Voltage Rating Vdc: 48V
• Voltage Rating Vac: 240V
• Mounting Type: DIN Rail
• Actuator Type: Handle
• Brand/series: QOU Miniture — Low Ampere
• Number Of Poles: 2
• Special Features: Visi-Trip® Trip Indicator
• Voltage Rating: 120/240 V
• Leaded Process Compatible: No
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

QOU Miniature Circuit Breakers and Switches
Application Information
6
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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:
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:
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QO Miniature Circuit Breaker Family
Description
No. of Poles
Ampere Rating
Rating
Suffix
120/240 Vac
240 Vac
48 Vdc
60 Vdc
277 Vac for QYU, UL 1077 recognized supplementary protector only (not a branch circuit breaker)
U – Unit Mounted (Lugs on Both Ends)
1 – 1-pole
2 – 2-pole
3 – 3-pole
10–125 Ampere Rating
00 = 60 A, 000 = 100 A, and 0001 - 125 A QOU Switch
1- and 2-pole
No Letter-Standard 120/240 Vac Rating
VH - 22,000 AIR
XXX (i.e., 2100) - Indicates Factory-installed Accessory (See page 12)
Catalog Numbers
2-pole
VH - 22,000 AIR
H-240 Vac Rating
QO
3-pole
No Letter - 240 Vac Rating
VH - 22,000 AIR
U
Typical Catalog Number:
2
30
H
09/2005
2100