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Thermal Unit Selection

Tables 1–6

 
Table 1
Motor FLC (A)
Thermal Unit Number
1 T.U.
3 T.U.
0.33–0.36
0.37–0.40
0.41–0.45
0.46–0.52
0.53–0.59
0.29–0.32
0.33–0.36
0.37–0.39
0.40–0.47
0.48–0.56
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
0.60–0.66
0.67–0.73
0.74–0.81
0.82–0.91
0.92–1.02
0.57–0.63
0.64–0.69
0.70–0.77
0.78–0.86
0.87–0.96
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
1.03–1.14
1.15–1.29
1.20–1.42
1.43–1.64
1.65–1.80
0.97–1.11
1.12–1.23
1.24–1.37
1.38–1.55
1.56–1.75
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
1.81–2.10
2.11–2.30
2.31–2.61
2.62–2.99
3.00–3.37
1.76–1.92
1.93–2.16
2.17–2.50
2.51–2.81
2.82–3.16
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
3.38–3.94
3.95–4.24
4.25–4.54
4.55–5.29
5.30–5.73
3.17–3.40
3.41–3.76
3.77–4.00
4.01–4.68
4.69–5.18
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
5.74–6.35
6.36–7.08
7.09–7.83
7.84–8.47
8.48–9.83
5.19–5.51
5.52–6.19
6.20–7.12
7.13–8.15
8.16–8.60
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
9.84–10.5
10.6–11.4
11.5–12.8
12.9–13.9
14.0–16.1
16.2–18.0
8.61–9.21
9.22–10.1
10.2–11.2
11.3–12.0
—
—
B 14.0
B 15.5
B 17.5
B 19.5
B 22.0
B 25.0
Following Selections
for Size M-1 & M-1P Only.
—
—
16.2–17.6
17.7–20.6
20.7–23.1
23.2–26.0
—
—
11.3–12.1
12.2–13.6
13.7–15.3
15.4–17.3
17.4–19.1
19.2–21.7
21.8–24.2
24.3–26.0
B 19.5
B 22.0
B 25.0
B 28.0
B 32.0
B 36.0
B 40.0
B 45.0
Following Selections
for Size M-1P Only
23.2–27.1
27.2–29.2
29.3–33.0
33.1–36.0
—
—
—
—
B 36.0
B 40.0
B 45.0
B 50.0
Table 2
Motor FLC (A)
Thermal Unit Number
1 T.U.
3 T.U.
0.35–0.38
0.39–0.43
0.44–0.48
0.49–0.56
0.57–0.63
0.30–0.32
0.33–0.37
0.38–0.39
0.40–0.48
0.49–0.57
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
0.64–0.71
0.72–0.78
0.79–0.88
0.89–0.99
1.00–1.15
0.58–0.64
0.65–0.70
0.71–0.78
0.79–0.87
0.88–0.98
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
1.16–1.23
1.24–1.43
1.44–1.51
1.52–1.75
1.76–1.93
0.99–1.13
1.14–1.25
1.26–1.40
1.41–1.58
1.59–1.79
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
1.94–2.25
2.26–2.47
2.48–2.81
2.82–3.20
3.21–3.63
1.80–1.91
1.92–2.20
2.21–2.55
2.56–2.87
2.88–3.24
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
3.64–4.19
4.20–4.53
4.54–4.89
4.90–5.68
5.69–6.27
3.25–3.48
3.49–3.85
3.86–4.10
4.11–4.79
4.80–5.31
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
6.28–6.85
6.86–7.73
7.74–8.50
8.51–9.29
9.30–10.4
5.32–5.65
5.66–6.35
6.36–7.31
7.32–8.34
8.35–8.84
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
10.5–11.3
11.4–12.3
12.4–13.9
14.0–15.0
15.1–18.0
8.85–9.47
9.48–10.4
10.5–11.5
11.6–12.0
—
B 14.0
B 15.5
B 17.5
B 19.5
B 22.0
Following Selections
for Size M-1 & M-1P Only.
—
15.1–17.4
17.5–19.2
19.3–22.0
22.1–24.6
11.6–12.4
12.5–14.0
14.1–15.8
15.9–17.8
17.9–19.7
B 19.5
B 22.0
B 25.0
B 28.0
B 32.0
24.7–26.0
—
—
19.8–22.4
22.5–25.1
25.1–26.0
B 36.0
B 40.0
B 45.0
Following Selections
for Size M-1P Only.
24.7–29.1
29.2–31.7
31.8–36.0
—
—
—
B 36.0
B 40.0
B 45.0
 
Table 3
Motor FLC (A)
Thermal Unit Number
1 T.U.
3 T.U.
0.29–0.31
0.32–0.36
0.37–0.39
0.40–0.47
0.48–0.56
0.28–0.29
0.30–0.33
0.34–0.36
0.37–0.44
0.45–0.52
B 0.44
B 0.51
B 0.57
B 0.63
B 0.71
0.57–0.63
0.64–0.69
0.70–0.77
0.78–0.86
0.87–0.97
0.53–0.59
0.60–0.64
0.65–0.71
0.72–0.80
0.81–0.90
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
0.98–1.12
1.13–1.24
1.25–1.39
1.40–1.57
1.58–1.78
0.91–1.03
1.04–1.14
1.15–1.27
1.28–1.44
1.45–1.63
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
1.79–1.96
1.97–2.20
2.21–2.41
2.42–2.75
2.76–3.25
1.64–1.79
1.80–2.01
2.02–2.19
2.20–2.52
2.53–2.95
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
3.26–3.50
3.51–3.87
3.88–4.13
4.14–4.69
4.70–5.20
2.96–3.17
3.18–3.50
3.51–3.73
3.74–4.22
4.23–4.68
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
5.21–5.53
5.54–6.23
6.24–7.18
7.19–8.20
8.21–8.98
4.69–4.98
4.99–5.59
5.60–6.43
6.44–7.41
7.42–8.02
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
8.99–9.63
9.64–10.6
10.7–11.8
11.9–12.7
12.8–14.3
8.03–8.59
8.60–9.52
9.53–10.5
10.6–11.2
11.3–12.0
B 14.0
B 15.5
B 17.5
B 19.5
B 22.0
14.4–16.1
16.2–18.0
—
—
B 25.0
B 28.0
Following Selections
for Size M-1 & M-1P Only.
—
—
16.2–18.3
18.4–20.2
20.3–23.0
11.3–12.7
12.8–14.3
14.4–16.1
16.2–17.8
17.9–20.1
B 22.0
B 25.0
B 28.0
B 32.0
B 36.0
23.1–26.0
—
—
20.2–22.6
22.7–25.5
25.6–26.0
B 40.0
B 45.0
B 50.0
Following Selections
for Size M-1P Only
25.9–29.0
29.1–30.8
30.9–32.7
32.8–36.0
—
—
—
—
B 45.0
B 50.0
B 56.0
B 62.0
 
Table 4
Motor FLC (A)
Thermal
Unit
Number
1 T.U.
3 T.U.
0.32–0.33
0.34–0.38
0.39–0.41
0.42–0.50
0.51–0.61
0.29–0.30
0.31–0.35
0.36–0.37
0.38–0.45
0.46–0.54
B 0.44 
B 0.51
B 0.57
B 0.63
B 0.71
0.62–0.68
0.69–0.74
0.75–0.83
0.84–0.93
0.94–1.05
0.55–0.61
0.62–0.66
0.67–0.74
0.75–0.83
0.84–0.93
B 0.81
B 0.92
B 1.03
B 1.16
B 1.30
1.06–1.21
1.22–1.34
1.35–1.50
1.51–1.70
1.71–1.93
0.94–1.07
1.08–1.19
1.20–1.33
1.34–1.51
1.52–1.70
B 1.45
B 1.67
B 1.88
B 2.10
B 2.40
1.94–2.12
2.13–2.38
2.39–2.61
2.62–2.99
3.00–3.53
1.71–1.87
1.88–2.10
2.11–2.29
2.30–2.63
2.64–3.09
B 2.65
B 3.00
B 3.30
B 3.70
B 4.15
3.54–3.80
3.81–4.21
4.22–4.49
4.50–5.10
5.11–5.66
3.10–3.32
3.33–3.67
3.68–3.91
3.92–4.43
4.44–4.91
B 4.85
B 5.50
B 6.25
B 6.90
B 7.70
5.67–6.03
6.04–6.79
6.80–7.84
7.85–8.96
8.97–9.82
4.92–5.23
5.24–5.88
5.89–6.77
6.78–7.90
7.91–8.44
B 8.20
B 9.10
B 10.2
B 11.5
B 12.8
9.83–10.4
10.5–11.6
11.7–12.9
13.0–13.9
14.0–15.7
15.8–18.0
8.45–9.05
9.06–9.99
10.0–11.0
11.1–11.9
12.0–12.0
—
B 14.0
B 15.5
B 17.5
B 19.5
B 22.0
B 25.0
Following Selections
for Size M-1 & M-1P Only.
—
—
17.8–20.1
20.2–22.2
22.3–25.3
25.4–26.0
—
12.0–13.4
13.5–15.1
15.2–17.0
17.1–18.9
19.0–21.4
21.5–24.0
24.1–26.0
B 22.0
B 25.0
B 28.0
B 32.0
B 36.0
B 40.0
B 45.0
Following Selections
for Size M-1P Only.
25.4–28.4
28.5–33.1
33.2–36.0
—
—
—
B 40.0
B 45.0
B 50.0
 
Table 5
Current Transformer Ratio
Thermal
Unit
Number
25/5
50/5
75/5
100/5
150/5
200/5
250/5
300/5
400/5
500/5
Motor FLC
 
10.6–11.7
11.8–13.2
13.3–14.8
21.1–23.6
23.7–26.5
26.6–29.6
31.7–35.4
35.5–39.8
39.9–44.5
42.3–47.2
47.3–53.1
53.2–59.4
63.4–70.9
71.0–79.7
79.8–89.1
84.5–94.6
94.7–105.
106.–118.
106.–117.
118.–132.
133.–148.
127.–141.
142.–159.
160.–177.
169.–188.
189.–212.
213.–237.
211.–236.
237.–265.
266.–296.
B 3.00
B 3.30
B 3.70
14.9–17.2
17.3–19.6
19.7–22.3
29.7–34.5
34.6–39.2
39.3–44.6
44.6–51.8
51.9–58.9
59.0–67.0
59.5–69.2
69.3–78.6
78.7–89.3
89.2–103.
104.–117.
118.–133.
119.–138.
139.–156.
157.–178.
149.–172.
173.–196.
197.–223.
178.–207.
208.–235.
236.–267.
238.–276.
277.–314.
315.–357.
297.–345.
346.–360.
—
B 4.15
B 4.85
B 5.50
 
Table 6
Current Transformer Ratio
Thermal
Unit
Number
25/5
50/5
75/5
100/5
150/5
200/5
250/5
300/5
400/5
500/5
Motor FLC
 
10.6–11.9
12.0–13.4
13.5–15.0
15.1–16.6
21.2–23.9
24.0–26.9
27.0–30.0
30.1–33.4
31.8–35.9
36.0–40.3
40.4–45.1
45.2–50.1
42.4–47.9
48.0–53.8
53.9–60.1
60.2–66.9