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Home> Technical Articles> How do you set a thermal magnetic trip unit?
How do you set a thermal magnetic trip unit?
NOVEMBER 02, 2022
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How does a thermal magnetic trip unit work? - Schneider ElectricAug 6, 2002 — Issue:How does a thermal-magnetic trip unit work in a circuit breaker?Product Line:Circuit BreakersEnvironment:Miniature and Molded Case
Q and M-Frame Circuit Breaker Instruction Leaflet for Breaker Thermal-Magnetic Trip Unit Trip units for Q-frame and M-frame circuit breakers (Fig. excess of the magnetic setting, the tripping action is.8 pagesThe Basics Of Circuit Breaker Tripping Units | EEP - Electrical Dec 21, 2015 — The thermomagnetic trip unit consists of two parts: The thermal trip unit – Made up by a bimetal thermal device which actuates the opening of a
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| G MM | G1 MM | H7 MM | D2 MM | H2 MM | H6 MM | D25 MM | G (in) | |
| 12CB350 10442 | - | - | - | - | 2.0 in; 51 mm | - | - | - |
| 6CB200 408368 | - | - | - | - | - | - | - | - |
| 45CB525 502369 | 5 lb·ft²; 0.21 kg·m² | - | - | - | 50 hp; 37 kW | 4.38 in; 111 mm | - | - |
| 14CB400 408376 | 3.75 in; 95 mm | - | - | - | - | - | - | - |
| 40CB525 407099 | - | - | - | 137 mm | - | - | - | Pintsch Bubenzer |
| 26CB525 408281 | - | - | 152 lb; 69 kg | - | 81 lb; 37 kg | 126 lb; 57 kg | - | - |
| 18CB500 408277 | - | - | - | - | - | - | 6 | - |
| 12CB350 408374 | - | - | - | - | - | - | - | Air Applied |
| 42VC650 142121 | - | - | - | - | - | 35 in; 57 in | 10CB300 | - |
| 8CB250 142096JC | - | 1.750 thru 2.500 | - | - | 1.750 thru 2.500 | - | - | - |
| 40CB525 105491 | 12.78 in; 325 mm | - | - | - | - | 4.88 in; 124 mm | - | 0.531 in; 13.5 mm |
| 24VC1000 107604 | - | - | 10CB300 | - | - | - | - | 10.25 in; 260 mm |
| 45CB525 104433 | - | - | - | 1.750 thru 2.500 | 9.64 in; 227 mm | - | - | - |
| 28VC1000 5097 | 12 | 11.630 in; 295 mm | - | - | Air Applied | - | - | 18.250 in; 463.5 mm |
| 24CB500 142267KT | - | - | - | - | - | Clutch only, Assembly Number, 6-160-200-307-0 | - | - |
| 76VC2000 515152 | - | 1.8 | 4 - 1/2 NPT | - | 185 | 1411 lb; 640 kg | - | 7.25 in; 184.2 mm |
| 30CB525 104131 | 416794 | - | 58.688 in; 1490.7 mm | 700 in³; 11.5 dm³ | - | 7.13 in; 181 mm | 1-11.5 | 16.13 in; 410 mm |
| 35CM500 146207 | - | 142 mm | 4700 min-1 | - | Spring Applied, Electric Release | - | - | - |
| 42VC1200 509647 | 3.44 in; 4.31 in | - | - | - | - | Eaton-Airflex | - | - |
| 42VC650 509703 | 3.44 in; 4.31 in | - | - | 3.3 in; 84 mm | - | - | - | - |
| 45CB525 105492 | - | - | - | 3.7 in; 94 mm | Eaton-Airflex | - | - | - |
| 76VC2000 10812 | - | 1294 lb; 587 kg | - | 4.38 in; 111 mm | 411873 | - | Air Applied | 1887 lb·ft²; 79.25 kg·m² |
| 26CM475 51224 | - | 2.0 in; 51 mm | Air Applied | 73 in | 87 in | 0.531 in; 13.5 mm | 10CB300 | - |
| 40CB525 142273 | Air Applied | - | - | - | - | - | Eaton-Airflex | - |
| 28CB525 142438 | - | 1956 lb; 887 kg | 19.87 in; 505 mm | - | - | - | - | 32.75 in; 831.9 mm |
| 16VC600 14264 | - | - | - | - | - | - | - | - |
| 24VC1000 104682 | 2.75 in; 70 mm | - | 172 lb; 78 kg | - | 3.81 in; 97 mm | 6.60 in; 168 mm | 1011 lb; 458 kg | 106000 lb·in; 12000 Nm |
| 10CB300 105784 | - | 8CB250 | 0.54 in; 14 mm | - | Eaton-Airflex | 3.25 in; 83 mm | 7.19 in; 183 mm | - |
| 30CB525 104429 | - | - | 1477 lb; 669 kg | 407098 | 319 lb; 145 kg | 2.75 in; 70 mm | 7.10 in; 180 mm | - |
| 40CM550 512244 | - | - | - | - | 5.63 in; 143 mm | - | 9.13 in; 232 mm | 3.31 in; 97 mm |
| 14CB400 105786 | - | - | - | 3/8-18 in | - | - | - | 43 lb·ft²; 1.81 kg·m² |
| 20VC600 142641 | - | - | - | - | 1.750 thru 2.500 | - | - | - |
| 32VC1000 104703 | - | - | - | 6.50 in; 165 mm | - | - | 8.50 in; 216 mm | - |
| 45CB525 142443 | - | - | - | - | 3.2 in; 81 mm | - | Air Applied | 1.750 thru 2.500 |
| 60VC1600 509692 | Wichita Clutch | 35.50 in; 901.7 mm | - | - | 0.38 in; 9.5 mm | - | 19.00 in; 480 mm | - |
| 28CB525 105487 | 0.16 in; 4 mm | - | 3/8-24 | - | 12.5 in; 318 mm | - | - | 0.50 in; 13 mm |
| DW66HEVC16 | - | 8150 lb·in; 921 Nm | 13.06 in; 332 mm | - | - | - | - | - |
| 24VC650 408281 | - | - | - | 575 rpm | 3255000 lb·in; 367755 Nm | 7077 lb·ft²; 298 kg·m² | - | - |
| 111.5VC500 10704 | - | 0.28 in | - | - | - | - | - | - |
| 11.5VC500 142639 | - | - | - | 15.36 in; 390 mm | - | - | - | - |
| 20VC600 105864 | 0.54 in; 14 mm | 2.69 in; 68 mm | 10.75 in; 273 mm | - | 3.25 in; 83 mm | - | - | - |
| 40CB525 142273 | - | - | - | - | - | 34.12 in; 867 mm | 10 | - |
| 32CB525 142271KT | - | - | - | - | - | - | - | - |
| 66VC1600 142097 | - | 169 mm | - | - | - | - | 142 mm | - |
| 37VC650 10544 | 14.500 in; 444.5 mm | 475 rpm | 8 | 44.86 in; 1139 mm | 28.11; 667 | 41.500 in; 1054.1 mm | 16.50 in; 419 mm | 16 |
| 20VC1000 107603 | 133 lb; 60 kg | - | 22CB500 | 165 mm; 6.50 in | - | 6.00 in; 152 mm | - | - |
| 60VC1600 104709 | 7-346-310-100-0 | 2104000 lb.in; 233468 Nm | Wichita Clutch | - | 58.747/58.750 in; 1492.17/1492.25 mm | - | 2200 hp; 1641 kW | - |
| 24CB500 104128 | - | - | 58 mm | 700 mm | 2200 min-1 | 570 mm | - | - |
| 32VC1000 509706 | 4.38 in; 111 mm | 11.00 in; 279 mm | - | 1/2-14 in | 6.00 in; 152 mm | - | - | - |
| 18CB500 105503 | 5.50 in; 140 mm | - | - | - | - | 408277 | - | - |
| 30CB525 142439 | 12.8 in; 325 mm | - | - | 2.0 lb; 0.9 kg | - | - | - | - |
| 40CB525 104432 | 1.44 in; 37 mm | - | 137000 lb·in; 15500 Nm | 254 lb; 115 kg | - | 234 lb; 106 kg | 97 lb·ft²; 4.07 kg·m² | - |
| 40CB525 142273KT | 0.25 in; 6 mm | 12.69 in; 322 mm | 750 rpm | - | 40.19 in; 1021 mm | - | - | 9.000 º |
| 20CB500 104126 | - | - | 8.50 in; 216 mm | 3/4 RH | 730 lb·ft²; 30.66 kg·m² | - | - | - |
| 32VC1000 509696 | 641 mm; 25.25 in | - | - | - | - | - | - | 91 lb·ft²; 3.82 kg·m² |
| 33VC650 1076 | - | - | - | - | 280 in³; 4.59 dm³ | - | - | - |
| 14CB400 104421 | 2.50 in; 64 mm | - | - | Air Applied | 173 lb; 79 kg | 781 lb; 354 kg | - | - |
| 66VC16 | - | - | - | - | - | - | - | - |
| 30CM500 512349 | Eaton-Airflex | 1882 lb; 855 kg | 15.00 in; 381 mm | - | 1700 rpm | - | Spring Applied, Air Release | - |
| 32VC1000 142126 | - | 20 | 380 lb·in; 42.93 Nm | 42.22 in; 1072 mm | - | - | 7.69 in; 195 mm | - |
| 37VC650 104624 | Air Applied | 12.50 in; 318 mm | - | 3.14 in; 80 mm | 4.63 in; 117 mm | 48 gpm; 182 dm³/min | 1.47 in; 37 mm | - |
| 42VC1200 104745 | - | - | - | - | Ed 121/6 for 19500 N Contract Force; Ed 201/6 for 31500 N Contract Force; Ed 301/10bb for 62500 N Contract Force; Ed 301/6 for 46000 N Contract Force | - | - | 9700 Nm |
| 14VC500 107041 | - | - | - | - | - | 28CB525 | - | - |
| 16VC600 505283 | 0.50 in; 13 mm | 0.84 in; 21 mm | 38.000 in; 965.2 mm | 30CB525 | 36.50 in; 927 mm | - | 916 in²; 5908 cm² | - |
| 33VC650 107046 | 406920 | - | - | - | - | 203 mm; 8.00 in | 2.50 in; 64 mm | - |
| 12CB350 142098KH | 0.75 in; 19 mm | - | 22.500 in; 571.5 mm | - | - | - | 0.656 in; 47 mm | 47 lb·ft² |
| 45CB525 142081 | - | 48 | 0.30 in; 8 mm | 34.50 in; 876 mm | 4800 in³; 79 dm³ | 6940 in²; 45150 cm² | - | - |
| 16VC1000 505284 | - | 1.38 in | - | - | 0.28 in | - | Eaton-Airflex | - |
| 33VC650 104623 | 6.60 in; 168 mm | 252 lb·ft²; 10.58 kg·m² | - | 8.70 in; 221 mm | - | 1.44 in; 37 mm | - | 270 lb·ft²; 11.34 kg·m² |
| 16VC600 14264 | - | 35200 lb·in; 3980 Nm | 5.187 in; 131.7 mm | - | 8.00 in; 203 mm | - | - | 16CB500 |
| 3CB150 142252 | - | - | - | 0.75 in; 19 mm | - | - | - | - |
| 28CB525 104428 | - | 411864 | - | - | Eaton-Airflex | - | C2 | - |
| 24VC1000 142675 | - | - | - | - | - | - | - | - |
| 18CB500 142433 | - | 62300 lb·in; 7040 Nm | - | 95 lb; 43 kg | 123 lb·ft²; 5.17 kg·m² | 25 lb·ft²; 1.05 kg·m² | - | - |
| 32CB525 104132 | - | 30 lb·ft²; 1.26 kg·m² | - | - | - | - | 60 psi; 4.1 bar | - |
| 14VC1000 142838 | 0.75 in; 19.1 mm | - | - | - | 28.750 in; 730.25 mm | - | - | 7.63 in; 193.8 mm |
| 52VC1200 104688 | - | - | 203 mm; 8.00 in | - | - | 14.75 in; 375 mm | Eaton-Airflex | 6.80 in; 173 mm |
| 12CB350 104137 | - | - | 22CB500 | 20.00 in; 508 mm | - | 29.00 lb·ft²; 1.22 kg·m² | - | - |
| 51VC1600 107611 | - | - | - | - | - | - | - | 9.70 in; 246 mm |
| 16VC600 105436 | - | 0.06 in; 2 mm | 0.31 in; 8 mm | 3/8-18 | 3.50 in; 89 mm | - | 12.13 in; 308 mm | 16.88 in; 429 mm |
| 37VC650 107774 | - | 932 lb; 422 kg | 5.90 in; 150 mm | 211 lb·ft²; 8.86 kg·m² | - | - | - | - |
| 16VC1000 505283 | - | 0.75 in; 19 mm | - | - | - | - | 46.00 lb·ft²; 1.93 kg·m² | - |
| 28VC1000 107605 | 110 mm | 495 W | - | - | - | - | - | - |
| 24VC650 107044 | - | 1-11 1/2 NPT | 67.000 in; 1701.8 mm | 0.88 in; 22 mm | - | 32 | - | 7.13 in; 181 mm |
| 20VC600 142116 | - | Spring Applied, Electric Release | 2.79 A | 60 mm; 65 mm; 75 mm | - | 400 Nm; 520 Nm; 630 Nm | - | A450-1; A550; A660 |
| 28VC1000 104723 | 22.000 in; 558.80 mm | - | - | - | - | - | Air Applied | 6.50 in; 165.1 mm |
| 16CB500 142211KT | - | - | - | 12.5 in; 318 mm | - | 1/8-27 | 153x261 | AA2 |
| 38VC1200 509646 | 12.8 in; 325 mm | Eaton-Airflex | 1 | - | - | - | 14.2 in; 361 mm | 1-14 |
| 24VC650 142117 | 406906 | - | 480 lb; 217 kg | 6.6 lb·ft²; 0.28 kg·m² | - | 411862 | - | - |
| 28VC1000 509695 | - | - | - | - | - | - | - | - |
| 12CB350 1055 | - | - | 0.31 in; 7.9 mm | - | 1090 rpm | - | 21/32 in; 16.7 mm | 5.13 in; 130.3 mm |
| 24CB500 105485 | 1288000 lb·in; 145415 Nm | - | - | - | - | - | 1610000 lb·in; 181769 Nm | - |
| 28CB525 10413 | - | - | 173 lb; 79 kg | 142 lb; 64 kg | - | 3/8-18 in | - | - |
| 20CB500 142265KT | - | - | - | 0.307 in²; 1.98 cm² | 15.4 in; 391 mm | 0.63 in; 16 mm | - | - |
| 11.5VC500 142639 | 1-11 1/2 | 3/8-16 | 5.00 in; 127 mm | 104909AA | - | - | 3.75 in; 95 mm | - |
| 14VC1000 411111 | - | - | 0.69 in; 18 mm | - | 2.3 in; 58 mm | - | 15.4 in; 391 mm | - |
| 32CB525 142271 | - | - | 24.88 in; 632 mm | 138 lb; 63 kg | 34 lb·ft²; 1.43 kg·m² | 21.375/21.378 in; 542.93/543.00 mm | 0.25 in; 6.4 mm | - |
| 42VC650 142647 | - | - | - | - | - | Tapped Holes | - | 305 lb; 138 kg |
| 8CB250 142096 | - | - | - | - | - | - | 36 mm | - |
| DW60HEVC16 | - | - | 1.13 in; 29 mm | 2.09 in; 53 mm | 0.47 in; 12 mm | 7.34 in; 186 mm | 0.250 in; 6.4 mm | - |
| 76VC1600 Consult Factory | - | - | 15 lb·ft²; 0.64 kg·m² | 27; 59 | 3 | 8.375 in; 212.7 mm | 0.04; 2.33 | - |
| 24VC650 105865 | - | - | - | - | - | - | - | - |
| 28VC650 5097 | - | - | 106 lb; 48.1 kg | - | - | 6.13 in | 20.000 in; 508.00 mm | - |
| 28VC650 105866 | 15.75 in; 400.1 mm | - | 0.25 in; 6.4 mm | 31 psi; 2.14 bar | 14.25 in; 362 mm | 275 lb·ft²; 11.59 kg·m² | - | 48 psi; 3.31 bar |
| 24CB500 142436 | - | - | - | 8.1 lb·ft²; 0.34 kg·m² | - | - | - | 12 lb·ft²; 0.5 kg·m² |
| 16CB500 105482 | - | 0.75 in; 19 mm | - | - | - | - | - | - |
| 36CB525 407098 | - | - | - | 0.0360 kg·m² | - | 400 mm; 450 mm | - | 148 mm |
Thermal-Magnetic / Magnetic Only Molded Case Circuit Square D® thermal-magnetic molded case circuit breakers have a permanent trip unit that contains a factory preset thermal trip element and a magnetic trip 174 pages
The Basics of Molded Case Circuit Breakers | EC&MA thermal magnetic trip unit is best suited to most general-purpose applications as it's temperature sensitive and automatically will follow safe cable and siemens - Peterson-panelinterchangeable trip unit (types FD6-A, HFD6), thermal magnetic for overload protection and an additional set of "blow-apart".57 pages
Thermal-Magnetic Trip Unit Summary - Schneider ElectricThermal-magnetic trip units are designed to provide protection for distribution or for Trip unit setting range: minimum setting/maximum setting.Thermal Magnetic Trip Units FD frameThermal Magnetic Trip Units. FD frame. The trip unit is an integrated part of the breaker and magnetic release set at 10 x the selected rating.4 pages
Molded Case Circuit Breaker Trip Units, Types and ApplicationsSimple to configure Thermal Magnetic Trip Unit – Thermal Element Setting Adjustment – Most solid-state trip units include some ability to adjust the 36 pagesTHERMAL MAGNETIC TRIP UNIT SETTINGS - Mike Holt's Feb 24, 2019 — The dials adjust the instantaneous trip setting from 500% to 1000% of the trip unit rating. B
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