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CURVE
NUMBER
1.03
1.05
1
1437
854
2
2874
1707
3
4311
2561
4
5748
3415
5
7184
4269
6
8621
5122
7
10058
5976
8
11495
6830
9
12932
7683
4–34
Courtesy of NationalSwitchgear.com
•
AUTO RESET O/L TRIPS: When enabled, this feature will automatically reset overload
trips once the thermal capacity (TC) decreases to 15% or less. All other types of trips
are not affected by this feature.
100000
10000
1000
TRIP TIME
(seconds)
100
10
1
0
0.1
FIGURE 4–6: Phase Timed Overload Curves
Table 4–2: 239 Phase Overload Trip Times (Seconds)
MULTIPLE OF MOTOR FULL LOAD CURRENT
1.1
1.5
2
2.5
416.7
70.0
29.2
16.7
833.4
140.0
58.3
33.3
1250.0
210.0
87.5
50.0
1666.7
280.0
116.6
66.6
2083.4
349.9
145.8
83.3
2500.1
419.9
174.9
100.0
2916.8
489.9
204.1
116.6
3333.5
559.9
233.3
133.3
3750.1
629.9
262.4
149.9
CHAPTER 4: PROGRAMMING
MULTIPLIER
1.0
10.0
CURRENT (I/Ipu)
3
4
5
6
10.9
5.8
3.64
2.50
21.9
11.7
7.29
5.00
32.8
17.5
10.93
7.49
43.7
23.3
14.57
9.99
54.7
29.1
18.22
12.49
65.6
35.0
21.86
14.99
76.5
40.8
25.50
17.49
87.5
46.6
29.15
19.98
98.4
52.5
32.79
22.48
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
15
12
9
7
4
3
2
1
100.0
8
10
11
1.39
0.88
0.73
2.78
1.77
1.46
4.16
2.65
2.19
5.55
3.53
2.91
6.94
4.42
3.64
8.33
5.30
4.37
9.71
6.18
5.10
11.10
7.06
5.83
12.49
7.95
6.56
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