QOU150 SQUARE D, QOU150 Datasheet - Page 17

• Manufacturer Part Number: QOU150
• Description: CIRCUIT BREAKER, THERMAL MAG, 1P, 50A
• Manufacturer: SQUARE D
• Series: QOUr
• Type: Thermal/Magneticr

Specifications of QOU150

• Actuator Style: Toggle
• No. Of Poles: 1
• Current Rating: 50A
• Voltage Rating Vdc: 48V
• Voltage Rating Vac: 240V
• Mounting Type: DIN Rail
• Actuator Type: Handle
• Brand/series: QOU Miniture — Low Ampere
• Number Of Poles: 1
• Special Features: Visi-Trip® Trip Indicator
• Voltage Rating: 120 V
• Leaded Process Compatible: No
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

09/2005
UL REQUIREMENTS
A UL label on the QOU miniature circuit breaker indicates that the circuit breaker meets the
requirements of UL Standard 489 for molded case circuit breakers.
Underwriters Laboratories Inc. (UL), the Canadian Standards Association (CSA), the National Electrical
Manufacturers Association (NEMA), and the National Electrical Code (NEC) all define a circuit breaker as “a
device designed to open and close a circuit by non-automatic means and to open the circuit automatically at
a predetermined overcurrent without damage to itself when properly applied within its rating.”
A molded case circuit breaker is one “that is assembled as an integral unit in a supportive and
enclosing housing of insulated material.”
A UL label also means the production procedure is monitored by UL inspectors for continuing
conformance to UL performance requirements. These requirements are based on sound engineering
principles, research, records of test and field experience, and information gathered from users and
inspection authorities.
UL 489 and CSA 22.2 #5-02 Test Procedures
Limited Available Fault Current Tests
UL and CSA require a series of tests on a single set of sample circuit breakers for compliance with UL
Standard 489. The tests for thermal-magnetic circuit breakers are described below and conducted in
the order presented.
Since QOU switches are derivatives of QOU miniature circuit breakers,they do not have to go through
an overload test. They have to complete a withstand test (paragraph 11.1.7).
200% Thermal Calibration
Each pole of the circuit breaker must trip within a specified time limit when carrying 200% of its ampere
rating.
135% Thermal Calibration
With all poles connected in series, the circuit breaker must trip within a specified time limit when
carrying 135% of its ampere rating.
Overload
The circuit breaker is operated making and breaking 600% of its ampere rating, but not less than
150 A. For circuit breakers through 100 A, the number of 600% operations is 35 manual open and
close and 15 manual close and automatic open. For 125 A circuit breakers, the number of operations is
50 manual open and close.
Temperature Rise
While carrying 100% of rated current at a 104° F (40° C) ambient temperature and mounted in open
air, the circuit breaker is checked for temperature rise on a wiring terminal. The temperature rise must
not exceed a 122° F (50° C) rise above ambient temperature and must be within specified limits.
Endurance
The circuit breaker must successfully complete the number of switching operations shown in the table
below. One switching operation includes a motion to turn the circuit breaker on and a motion to turn the
circuit breaker off.
Table 8:
Amperes
0–100 A
125 A
QOU Circuit Breaker Switching Operations
Full Load Operations
6000
4000
QOU Miniature Circuit Breakers and Switches
No Load Operations
4000
4000
© 2005 Schneider Electric All Rights Reserved
UL Requirements
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