### Circuit Protection

```Bulletin 1492
Circuit Protection
Supplementary Protectors (Miniature Circuit Breakers), Continued
1492-GH, Continued
UL, CSA, and IEC Rated
Selection Guide — To select a miniature
circuit breaker, use the following
procedure:
• Determine the inrush correction factor
from Table 1.
• Determine the temperature correction
factor from Table 2.
• Determine the sealed current of the
• Multiply the sealed current by the two
correction factors and select the
closest higher ampere rating.
Example — What size miniature circuit
breaker should be selected for a solenoid
with sealed current of 0.5 A, an inrush ratio
of 1:8, and an ambient temperature of
+110°F (43.7°C)?
0.5 x 1.7 x 1.15 = 0.9775
Select the 1.0 A miniature circuit breaker.
Table 1.
Inrush Ratio Correction Table
Inrush Ratio
1:1 to 1:4
1:5
1:6
1:7
1:8
1.3
1.4
1.5
1.6
1.7
Factor
Note: For resistive loads, use inrush correction factor of 1.0.
Table 2.
Ambient Temperature Correction Table
Ambient Temperature
70°F
(21.1°C)
100°F
(37.8°C)
120°F
(48.9°C)
140°F
(60°C)
160°F
(71.1°C)
180°F
(82.2°C)
200°F
(93.3°C)
1.0
1.1
1.2
1.3
1.4
1.5
1.6
Factor
Tripping time of the miniature circuit breaker is determined from Table 3 below. Divide the miniature circuit breaker value by the
temperature correction factor from Table 2 above to determine the actual rated current referenced in Table 3.
Table 3.
Tripping Time
Tripping Times in Seconds at 70°F (21.1°C)
Percent Rated Current
100%
200%
300%
400%
500%
600%
1000%
2000%
Greater
No
Trip
10…40
3…18
1.5…9
0.8…6
0.003…4
0.003…2
Maximum
0.02
Tripping Times (Seconds)
Note: When several breakers are rail mounted adjacent to each other, the no-trip current will be 80% of rated current at 70°F (21.1°C).
Trip Current
10000
8000
6000
4000
3000
2000
Trip current is 140% of rated current.
Protector will hold 100% of rated
current indefinitely.
Will trip within one hour at 140% of
rated current.
1000
800
600
400
300
200
0.05 to 7.5 amp
10
8
6
4
3
2
1
.800
.600
.400
.300
.200
8 to 15 amp
SECONDS
TRIPPING TIME AT 70 F
100
80
60
40
30
20
°
.100
.080
.060
.040
.030
.020
.010
.008
.006
.004
.003
.002
80
70
60
50
100
150
200
300
800
700
600
500
400
1000
1500
2000
3000
4000
6000
5000
8000
10000
.001
PERCENT RATED CURRENT
111
Bulletin 1492
Circuit Protection
Supplementary Protectors (Miniature Circuit Breakers), Continued
1492-GH, Continued
Specifications ➊
Cat. No.
1492-GH Series B
Description
1-pole with universal mounting foot for Allen-Bradley and DIN Rail mounting
250V AC 50/60 Hz
65V DC
Maximum Voltage Ratings
Standard Current Ratings
Internal Resistance per Pole
A
Ω
0.2
44
0.5
6.6
0.8
2.55
1.0
1.97
1.2
1.22
1.5
0.86
Dielectric Strength
2.0
0.49
2.5
3.0
4.0
5.0
7.0
10.0 15.0
0.313 0.205 0.104 0.082 0.034 <0.20 <0.20
1500V AC
Shock: 25 G, 11 ms duration
Vibration: 5 G (10…500 Hz)
Shock and Vibration Specifications
Insulation Resistance
100 MΩ @ 500V DC
6000 cycles @ rated current (UL 1077)
4000 cycles @ 200% rated current
Operating Life
Temperature Range
–40…+149°F (–40…+65°C)
Housing Material
Glass-filled Polyamide 6.6
#22…#10 AWG (0.5…6 mm2)
Wire Size
Recommended Wire
Strip Length
0.44" (11.2 mm)
Terminals
Tubular screw with self-lifting box lug
Recommended Tightening Torque
10…12 lb-in. (1.13…1.4 Nm)
➊ Performance Data — See Publication A113, page Important-2.
Approvals
• UL 1077
• CSA 22.2 NO. 235
• VDE 0631 (IEC 60934)
In North America, the Cat. No. 1492-GH miniature circuit breaker is rated as a Supplementary Protector with a short-circuit current
rating. Internationally, it is rated by IEC as a Circuit Breaker for Equipment with an interrupt rating.
Electrical Characteristics
Voltage Rating
Short-Circuit Current Rating ➊
Interrupt Rating Icn (IEC only)
Poles
Rated Current (A)
1
0.2…15
250
—
1
0.2…15
—
80
1 kA, U1
1
9…14
250
—
2 kA, C1
1
0.2…15
AC
DC
UL 1077/CSA 22.2 #235 Supplementary Protector Rating
1 kA, U1
VDE 0631 (IEC 60934) Circuit Breaker for Equipment Ratings
250
65
0.2 kA, but not to exceed 100 x In
➊ The short-circuit current rating is followed by a letter and number designating the test conditions and any calibrations and dielectric tests following
the short-circuit test. These designations are defined as follows (see ➋ also):
C — Indicates that the short-circuit test was conducted with series overcurrent protection
U — Indicates that the short-circuit test was conducted without series overcurrent protection
1 — Indicates that a recalibration and dielectric test was not conducted as part of the short-circuit test
2 — Indicates that a recalibration and dielectric test was conducted as part of the short-circuit test
➋ These alphanumeric designations were established by UL. CSA has not yet adopted them; however, the test conditions are equivalent to UL
and the coding is appropriate.
112
```