Square D Digest 179

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Thermal Units

Thermal Unit Selection Thermal Unit Selection Tables

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Thermal Unit Table 3 (index and instructions: page 16-134 to page 16-138) Motor FLC (A)

Thermal Unit Table 4 (index and instructions: page 16-134 to page 16-138) Motor FLC (A)

Thermal Unit Number

1T.U.

3T.U.

1T.U.

3T.U.

0.29–0.31 0.32–0.36 0.37–0.39 0.40–0.47 0.48–0.56 0.57–0.63 0.64–0.69 0.70–0.77 0.78–0.86 0.87–0.97 0.98–1.12 1.13–1.24 1.25–1.39 1.40–1.57 1.58–1.78 1.79–1.96 1.97–2.20 2.21–2.41 2.42–2.75 2.76–3.25 3.26–3.50 3.51–3.87 3.88–4.13 4.14–4.69 4.70–5.20 5.21–5.53 5.54–6.23 6.24–7.18 7.19–8.20 8.21–8.98 8.99–9.63 9.64–10.6 10.7–11.8 11.9–12.7 12.8–14.3 14.4–16.1 16.2–18.0

0.28–0.29 0.30–0.33 0.34–0.36 0.37–0.44 0.45–0.52 0.53–0.59 0.60–0.64 0.65–0.71 0.72–0.80 0.81–0.90 0.91–1.03 1.04–1.14 1.15–1.27 1.28–1.44 1.45–1.63 1.64–1.79 1.80–2.01 2.02–2.19 2.20–2.52 2.53–2.95 2.96–3.17 3.18–3.50 3.51–3.73 3.74–4.22 4.23–4.68 4.69–4.98 4.99–5.59 5.60–6.43 6.44–7.41 7.42–8.02 8.03–8.59 8.60–9.52 9.53–10.5 10.6–11.2 11.3–12.0

B 0.44 B 0.51 B 0.57 B 0.63 B 0.71 B 0.81 B 0.92 B 1.03 B 1.16 B 1.30 B 1.45 B 1.67 B 1.88 B 2.10 B 2.40 B 2.65 B 3.00 B 3.30 B 3.70 B 4.15 B 4.85 B 5.50 B 6.25 B 6.90 B 7.70 B 8.20 B 9.10 B 10.2 B 11.5 B 12.8 B 14.0 B 15.5 B 17.5 B 19.5 B 22.0 B 25.0 B 28.0 B 22.0 B 25.0 B 28.0 B 32.0 B 36.0 B 40.0 B 45.0 B 50.0

0.32–0.33 0.34–0.38 0.39–0.41 0.42–0.50 0.51–0.61 0.62–0.68 0.69–0.74 0.75–0.83 0.84–0.93 0.94–1.05 1.06–1.21 1.22–1.34 1.35–1.50 1.51–1.70 1.71–1.93 1.94–2.12 2.13–2.38 2.39–2.61 2.62–2.99 3.00–3.53 3.54–3.80 3.81–4.21 4.22–4.49 4.50–5.10 5.11–5.66 5.67–6.03 6.04–6.79 6.80–7.84 7.85–8.96 8.97–9.82 9.83–10.4 10.5–11.6 11.7–12.9 13.0–13.9 14.0–15.7 15.8–18.0

0.29–0.30 0.31–0.35 0.36–0.37 0.38–0.45 0.46–0.54 0.55–0.61 0.62–0.66 0.67–0.74 0.75–0.83 0.84–0.93 0.94–1.07 1.08–1.19 1.20–1.33 1.34–1.51 1.52–1.70 1.71–1.87 1.88–2.10 2.11–2.29 2.30–2.63 2.64–3.09 3.10–3.32 3.33–3.67 3.68–3.91 3.92–4.43 4.44–4.91 4.92–5.23 5.24–5.88 5.89–6.77 6.78–7.90 7.91–8.44 8.45–9.05 9.06–9.99 10.0–11.0 11.1–11.9 12.0–12.0 — 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

16 NEMA AND DEFINITE PURPOSE CONTACTORS AND STARTERS

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Following Selections for Size M-1 & M-1P Only.

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11.3–12.7 12.8–14.3 14.4–16.1 16.2–17.8 17.9–20.1 20.2–22.6 22.7–25.5 25.6–26.0

17.8–20.1 20.2–22.2 22.3–25.3 25.4–26.0 —

16.2–18.3 18.4–20.2 20.3–23.0 23.1–26.0 — —

Following Selections for Size M-1P Only.

Following Selections for Size M-1P Only

25.4–28.4 28.5–33.1 33.2–36.0

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B 40.0 B 45.0 B 50.0

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

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Thermal Unit Table 5 (index and instructions: page 16-134 to page 16-138)

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

MotorFLC

10.6–11.7 11.8–13.2 13.3–14.8 14.9–17.2 17.3–19.6 19.7–22.3

21.1–23.6 23.7–26.5 26.6–29.6 29.7–34.5 34.6–39.2 39.3–44.6

31.7–35.4 35.5–39.8 39.9–44.5 44.6–51.8 51.9–58.9 59.0–67.0

42.3–47.2 47.3–53.1 53.2–59.4 59.5–69.2 69.3–78.6 78.7–89.3

63.4–70.9 71.0–79.7 79.8–89.1 89.2–103. 104.–117. 118.–133.

84.5–94.6 94.7–105. 106.–118. 119.–138. 139.–156. 157.–178.

106.–117. 118.–132. 133.–148. 149.–172. 173.–196. 197.–223.

127.–141. 142.–159. 160.–177. 178.–207. 208.–235. 236.–267.

169.–188. 189.–212. 213.–237. 238.–276. 277.–314. 315.–357.

211.–236. 237.–265. 266.–296. 297.–345. 346.–360. —

B 3.00 B 3.30 B 3.70 B 4.15 B 4.85 B 5.50

Thermal Unit Table 10 (index and instructions: page 16-134 to page 16-138) Motor FLC (A) Thermal Unit Number

Thermal Unit Table 9 (index and instructions: page 16-134 to page 16-138) Motor FLC (A)

Thermal Unit Number

43.6–47.3 47.4–51.3 51.4–54.6 54.7–59.7 59.8–65.1 65.2–70.1 70.2–75.1 75.2–82.2 82.3–89.2 89.3–96.5 96.6–104. 105.–113. 114.–123. 124.–132. 133.–150.

CC 54.5 CC 59.4 CC 64.3 CC 68.5 CC 74.6 CC 81.5 CC 87.7 CC 94.0 — CC 112.0 CC 121.0 CC 132.0 CC 143.0 CC 156.0 CC 167.0

15.3–16.7 16.8–19.8 19.9–22.8 22.9–25.8 25.9–30.4 30.5–31.9 32.0–34.2 34.3–38.8 38.9–44.2 44.3–50.2 50.3–57.1 57.2–63.2 63.3–68.6 68.7–78.6 78.7–86.9 87.0–100.0

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— — — C 90.0

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16-140

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