Datasheet

Thermal Overcurrent Circuit Breaker 3120-F...
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Issue D
2 - 70
2
The time/current characteristic curve depends on the ambient temperature
prevailing. In order to eliminate nuisance tripping, please multiply the circuit
breaker current ratings by the derating factor shown below. See also section
Technical information.
Ambient °F
temperature °C
-22
-30
-4
-20
+14
-10
+32
0
+73.4
+23
+104
+40
+122
+50
+140
+60
Derating factor
0.8 0.76 0.84 0.92 1 1.08 1.16 1.24
Typical time/current characteristics
+23 °C
+73.4 °F
+60 °C
+140 °F
-30 °C
-22 °F
12468102040
… times rated current
Trip time in seconds
10000
1000
100
10
1
0.1
+23 °C
+73.4 °F
+60 °C
+140 °F
-30 °C
-22 °F
12468102040
… times rated current
Trip time in seconds
10000
1000
100
10
1
0.1
single or double pole load
0.1…2 A
2.5…20 A