Specifications

56
COMPACT
®
NS circuit breaker
COMPACT
®
NS circuit breaker: supplementary technical information
UL 489 test procedure
Standard tests
For electronic trip circuit breakers and uncompensated
thermal-magnetic circuit breakers rated 40°C, the test
sequences are as shown in the table:
Test Sequence
XYZ
200% calibration at 25°C (77°F) ■■■
135% calibration at 25°C (77°F) ■
Calibration of adjustable instantaneous trip ■
Overload ■
Tungsten lamp load ➀
100% calibration at 40°C (104°F) ➁
Temperature and 100% calibration at 25°C (77°F) ■
Endurance ■
200% calibration at 25°C (77°F) repeated ■
135% calibration at 25°C (77°F) repeated ■
Interrupting ability (Y sequence) ■
Interrupting ability (Z sequence) ■
200% trip out at 25°C (77°F) ■■
Dielectric voltage withstand ■■■
➀ Applies only to circuit breakers rated 50 A or less, and 125 or 125/250 V or less.
➁ Applies only to thermal-magnetic breakers rated 40°C.
Standard specifications
Temperature
The temperature rise at the circuit breaker and at its
terminals does not exceed specified limits when
connected with specified cables or bus bars (see
below) and at its rated current.
Examples of specified wires and bus
■ 75°C copper wire
Endurance
The circuit breaker must complete an endurance test:
■ Operations at rated current and rated voltage;
■ Followed by no load operation.
The power factor shall be 0.75 to 0.80 lagging.
Examples
Frame size Number of cycles of operations
With Without Total
current current
100 A 6,000 4,000 10,000
225 A 4,000 4,000 8,000
400 A 1,000 5,000 6,000
600 A 1,000 5,000 6,000
800 A 500 3,000 3,500
1200 A 500 2,000 2,500
1600 A 500 2,000 2,500
2000 A 500 2,000 2,500
2500 A 500 2,000 2,500
3000 A 400 1,100 1,500
Rating Number Size
100 A 1 #1 AWG (60°C)
1 #3 AWG
250 A 1 250 kcmil
400 A 2 3/0 AWG
600 A 2 350 kcmil
800 A 3 300 kcmil
1000 A 3 400 kcmil
1200 A 4 350 kcmil
■ Copper busbar
Rating Number Size
1600 A 2 1/4 x 3
2000 A 2 1/4 x 4
2500 A 2 1/4 x 5
4 1/4 x 2 - 1/2
3000 A 4 1/4 x4
(1200 A or less: 1000 A / in
2
)
200% calibration at 25°C
The circuit breaker must trip within time limits which depend on the rating from three
minutes for a 30 A rated circuit breaker, up to 30 minutes over 2000 A.
135% calibration at 25°C
The circuit breaker must trip within two hours (for circuit breakers rated more than 50 A).
Calibration of adjustable instantaneous trip
The circuit breaker must trip within the range of 80-120% of the maximum marked
tripping current and 75-125% of the minimum marked tripping current.
Overload
■ Up to 1600 A: 50 operations at 600% of rated current;
■ 2000 and 2500 A: 25 operations at 600% of rated current;
■ 3000 to 6000 A: three operations at 600% followed by 25 operations at 200% of
rated current.
The power factor shall be from to 0.45 to 0.50 lagging.
Calibration