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| Home > Products > Transformers > Industrial Control> Fuse Recommendations |
| Fuse Recommendations | Click here for a printable copy: |
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Primary Fuse Recommendations for Hevi-Duty Industrial Control Transformers
Primary Voltage |
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VA |
120 | 200 | 208 | 220 | 230 | 240 | 277 | 440 | 460 | 480 | 550 | 575 | 600 |
| 50 | 1.25 (2.0) | .75 (1.25) | .6 (1.13) | .6 (1.13) | .6 (1) | .5 (.8) | .5 (.8) | 0.6 | 0.6 | 0.5 | 0.5 | 0.5 | 0.5 |
| 75 | 1.8 (3) |
1.13 (1.8) | 1 (1.8) |
1 (1.6) |
.8 (1.5) |
.8 (1.25) | .8 (1.25) | 0.9 | 0.9 | 0.8 | 0.8 | 0.7 | 0.7 |
| 100 | 2.5 (4) |
1.5 (2.5) |
1.4 (2.25) | 1.25 (2.25) | 1.25 (2) | 1.25 (2) | 1 (1.8) | 1.25 | 1.2 | 1.1 | 1.0 | 1.0 | 1.0 |
| 150 | 3.5 (6.25) | 2.25 (3.5) | 2 (3.5) | 2 (3.2) |
1.8 (3.2) | 1.8 (3) | 1.6 (2.5) | 1.8 | 1.8 | 1.7 | 1.6 | 1.5 | 1.5 |
| 200 | 5 (8) | 3 (5) | 2.8 (4.5) | 2.5 (4.5) | 2.5 (4) | 2.5 (4) | 2 (3.5) | 2.5 | 2.4 | 2.2 | 2.1 | 2.0 | 2.0 |
| 250 | 3 (5) | 3.5 (6.25) | 3.5 (6) | 3.2 (5.6) | 3.2 (5) | 3 (5) | 2.5 (4.5) | 3.125 | 3.0 | 2.8 | 2.7 | 2.6 | 2.6 |
| 300 | 4 (6.25) | 4.5 (7.5) |
4 (7) | 4 (6.25) | 3.5 (6.25) | 3.5 (6.25) | 3.2 (5) | 2 (3.2) | 1.8 (3.2) | 1.8 (3) | 1.6 (2.5) | 1.5 (2.5) | 1.5 (2.5) |
| 350 | 4.5 (7) | 5 (8) | 5 (8) | 4.5 (7.5) |
4.5 (7.5) |
4 (7) | 3.5 (6.25) | 2.25 (3.5) | 2.25 (3.5) | 2 (3.5) | 1.8 (3) | 1.8 (3) | 1.75 (2.5) |
| 500 | 6.9 | 4.1 | 4.0 | 3.7 | 3.6 | 3.4 | 5 (9) | 3.2 (5.6) | 3.2 (5) | 3 (5) | 2.5 (4.5) | 2.5 (4) | 2.5 (4) |
| 750 | 1.4 | 6.2 | 6.0 | 5.6 | 5.4 | 5.2 | 8 (12) | 5 (8) | 4.5 (8) | 4.5 (7.5) | 4 (6.25) | 3.5 (6.25) | 3.5 (6.25) |
| 1000 | 13.9 | 8.3 | 8.0 | 7.5 | 7.2 | 6.9 | 10 (17.5) | 3.5 (5.6) | 3.6 (5) | 3 (5) | 5 (9) | 5 (8) | 5 (8) |
| 1500 | 17.5 (30) | 9.3 | 9.0 | 8.5 | 8.1 | 7.8 | 4.9 | 4.6 | 4.5 | 4.2 | 4.0 | 3.9 | 3.9 |
| 2000 | 25 (40) | 15.0 | 15.0 | 15.0 | 14.5 | 13.9 | 8.7 | 8.3 | 8.0 | 7.5 | 7.2 | 6.9 | 6.9 |
| 3000 | 35 (60) | 20.0 | 20.0 | 20.0 | 20.0 | 20.0 | 13.1 | 12.5 | 12.0 | 11.3 | 9 (12) | 8 (12) | 8 (12) |
| 5000 | 60 (100) | 35.0 | 30.0 | 30.0 | 30.0 | 30.0 | 20.0 | 20.0 | 15.0 | 15.0 | 12 (20) | 12 (20) | 12 (20) |
| 7500 | 80 (150) | 9.3 | 9.0 | 8.5 | 8.1 | 7.8 | 4.9 | 4.6 | 4.5 | 4.2 | 20 (30) | 0 | 0 |
| 10K | 110 (200) | 15.0 | 15.0 | 15.0 | 14.5 | 13.9 | 8.7 | 8.3 | 8.0 | 7.5 | 25 (45) | 0 | 0 |
| 15K | 175 (300) | 20.0 | 20.0 | 20.0 | 20.0 | 20.0 | 13.1 | 12.5 | 12.0 | 11.3 | 35 (60) | 0 | 0 |
| 25K | 300 (500) | 35.0 | 30.0 | 30.0 | 30.0 | 30.0 | 20.0 | 20.0 | 15.0 | 15.0 | 60 (110) | 0 | 0 |
| 37K | 0 | 0 | 0 | 0 | 0 | 200 (350) | 0 | 0 | 0 | 100 (175) | 0 | 0 | 80 (150) |
| 50K | 0 | 0 | 0 | 0 | 0 | 300 (500) | 0 | 0 | 0 | 150 (250) | 0 | 0 | 110 (200) |
| 75K | 0 | 0 | 0 | 0 | 0 | 400 (750) | 0 | 0 | 0 | 200 (350) | 0 | 0 | 175 (300) |
| 100K | 0 | 0 | 0 | 0 | 0 | 600 (1000) | 0 | 0 | 0 | 300 (500) | 0 | 0 | 225 (400) |
| 167K | 0 | 0 | 0 | 0 | 0 | 900 (1600) | 0 | 0 | 0 | 450 (850) | 0 | 0 | 350 (650) |
| N
|
Fuse
= I*300% next size smaller if primary current is less than 2 amp. No
secondary fusing required. |
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| N | Fuse
= I*167% next size smaller if primary current is less than 9 amp. No
secondary fusing required. |
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| N
|
Fuse
= I*125% next size higher if primary current is 9 amp. or higher. No
secondary fusing required. (Fuse) = (I*250%) next size smaller if primary current is 9 amp or higher. Secondary fusing is required. See Chart for size. |
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| N | |||||||||||||
Recommended fuse sizes per UL 508 and NEC450-3 (B) (1), NED 430-72 and commercially available type KLD-R, FNQ-R and KLK-R. |
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Recommended Secondary Fuse Sizes (at 125% of rated current)
| Secondary Voltage | ||||||||||||
VA |
24 | 48 | 95 | 99 | 110 | 115 | 120 | 130 | 208 | 220 | 230 | 240 |
| Secondary Time Delay Dual Element Slow-Blow Fuse (Type 3 AG, FNM, KLM, TRM or equivalent) | ||||||||||||
| 50 | 2.6 | 1.3 | 0.6 | 0.6 | 0.6 | 0.5 | 0.5 | 0.5 | 0.3 | 0.3 | 0.3 | 0.3 |
| 75 | 3.9 | 2.0 | 1.0 | 1.0 | 0.9 | 0.8 | 0.8 | 0.7 | 0.5 | 0.4 | 0.4 | 0.4 |
| 100 | 5.2 | 2.6 | 1.3 | 1.3 | 1.1 | 1.1 | 1.0 | 1.0 | 0.6 | 0.6 | 0.5 | 0.5 |
| 150 | 7.8 | 3.9 | 2.0 | 1.9 | 1.7 | 1.6 | 1.6 | 1.4 | 0.9 | 0.9 | 0.8 | 0.8 |
| 200 | 10.0 | 5.2 | 2.6 | 2.5 | 2.3 | 2.2 | 2.1 | 1.9 | 0.9 | 1.2 | 1.1 | 1.0 |
| 250 | 13.0 | 6.5 | 3.3 | 3.2 | 2.8 | 2.7 | 2.6 | 2.4 | 1.5 | 1.4 | 1.1 | 1.3 |
| 300 | 20.0 | 7.8 | 4.0 | 3.8 | 3.4 | 3.3 | 3.1 | 2.9 | 1.8 | 1.7 | 1.6 | 1.6 |
| 350 | 20.0 | 9.1 | 4.6 | 4.4 | 4.0 | 3.8 | 3.6 | 3.4 | 2.1 | 2.0 | 1.9 | 1.8 |
| 500 | 30.0 | 13.0 | 6.6 | 6.3 | 5.7 | 5.4 | 5.2 | 5.8 | 3.0 | 2.8 | 2.7 | 2.6 |
| 750 | 40.0 | -- | 10.0 | 9.5 | 8.5 | 8.2 | 7.8 | 7.2 | 4.5 | 4.3 | 4.1 | 3.9 |
| 1000 | 50.0 | -- | 13.0 | 13.0 | 12.0 | 12.0 | 10.0 | 9.6 | 6.0 | 5.7 | 5.4 | 5.2 |
| 1500 | -- | -- | 20.0 | 20.0 | 20.0 | 20.0 | 20.0 | 15.0 | 9.0 | 8.5 | 8.2 | 7.8 |
| 2000 | -- | -- | 30.0 | 25.0 | 25.0 | 25.0 | 20.0 | 20.0 | 12.0 | 12.0 | 12.0 | 10.0 |
| 3000 | -- | -- | 40.0 | 40.0 | 35.0 | 35.0 | 35.0 | 30.0 | 18.0 | 17.0 | 20.0 | 15.0 |
| 5000 | -- | -- | 70.0 | 65.0 | 60.0 | 55.0 | 55.0 | 50.0 | 30.0 | 30.0 | 30.0 | 25.0 |
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