Complete Circuit Breakers Catalog - IDEC USA - #9

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Text version of the page
Resistance and Impedance Characteristics
o
3"
cd
V)
Go —
co'
3"
Coil Data
Impedance Correction Curve
id Current
DC Resistance
AC Impedance (50/60Hz)
Curves
Curves
AD, MD
AA, BA, MA
0.3A
9.67Q
9.82Q
0.5A
3.24Q
3.36Q
0.75A
1.45Q
1.490
1A
0.90Q
0.92O
2A
0.21Q
0.210
3A
0.09Q
0.092O
5A
0.036Q
0.036O
7.5A
0.017Q
0.0180
10A
0.012Q
0.0120
15A
0.0066Q
0.00680
20A
0.0048Q
0.0048O
25A
0.0043Q
0.00430
30A
0.0036Q
0.00410
100
10
c
Ü
S ra
0.1
0.01
0.001 0.01 0.1 1 10 100
Impedance (Q)
3"
Resistance Correction Curve
urv
e
s
A
D ■
nd
M
5
100
10
(A)
a y
V)
Go
o
n
3t cd
00
O
Tolerance ±25% (up to 20A), ±50% (25A and over).
A
s
ra x
0.1
Voltage Drop Due to Resistance or Impedance
The internal resistance or impedance of a circuit breaker tends to be larger for a smaller rated current. Therefore, when circuit breakers with a small rated current are used, voltage drop should be taken into consideration. Internal resistance also varies with time delay curves, even at the same rated current. This should also be considered during installation.
Time Delay Curve and Ambient Temperature
Since NRA series circuit breakers employ an electromagnetic tripping system, the rated current (trip current) is not affected by the ambient temperature, but the time delay varies with the oil viscosity in the tube. Lower oil viscosity at higher temperatures results in shorter delay; whereas at lower temperatures, the delay will be prolonged. The time delay curves, shown starting on page 888, are at 25°C. Time delay curves can be corrected.
0.01
0.001
0.1
10
100
0.01
Resistance (Q)
Temperature Correction Curves
Curves AA, BA, MA, AD, and MD At the minimum tripping current (125% current)
—I
s
rr
300
200
o
60
40
-40 -30 -20 -10
10 20
30 40
50
60 70 80 90
25
Ambient Temperature (°C)
— —
r
e 3t
r
s

pageCatalog pdf di En 2012-05-22-30