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Compact® NSF and NSJ 150 to 600 A Circuit Breakers
Section 13—Supplementary Technical Information
© 1995–2003 Schneider Electric All Rights Reserved
67
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 below:
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
• Copper Busbar
Calibration 200% calibration at 25° C—the circuit breaker must trip within time limits which depend on the rating
from three minutes for 30 A rated circuit breakers to 30 minutes for over 2000 A rated circuit breakers.
135% calibration at 25° C—the circuit breaker must trip within two hours for circuit breakers rated more
than 50 A.
Test Sequence
X Y Z
200% Calibration at 25° C (77° F) ■■■
135% Calibration at 25° C (77° F) ■
Calibration of Adjustable Instantaneous Trip ■
Overload ■
Tungsten Lamp Load
①
100% Calibration at 40° C (104° F)
②
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 ■■■
① Applies only to circuit breakers rated 50 A or less, and 125 or 125/250 V or less.
② Applies only to thermal-magnetic breakers rated 40° C.
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
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
)