K. 277 Volts Primary, Single Phase Autotransformers
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TEMCo Single Phase Autotransformers are 50/60 Hz rated and come in a NEMA 3R enclosure for indoor use as well as outdoor protection against rain and sleet. Our transformers are built to last, guaranteed. That's why we back these with a decade long warranty.
• UL Listed, CSA Approved
• Aluminum or Copper windings
• 50/60 Hz rated
• NEMA 3R Enclosure (for indoor or outdoor use)
Looking for a different specification? Click here to see all the primary voltage configurations, or see our full selection of autotransformers here.
Product Selection
277V Primary, Copper Wound, 1 Phase Autotransformers
| kVA | Select Secondary Voltage Below | |||||||
| 550V | 480V | 460V | 440V | 416V | 400V | 380V | 347V | |
| 3 | T51310 | T51320 | T51330 | T51340 | T51350 | T51360 | T51370 | T51380 |
| 5 | T51311 | T51321 | T51331 | T51341 | T51351 | T51361 | T51371 | T51381 |
| 7 | T51312 | T51322 | T51332 | T51342 | T51352 | T51362 | T51372 | T51382 |
| 10 | T51313 | T51323 | T51333 | T51343 | T51353 | T51363 | T51373 | T51383 |
| 15 | T51314 | T51324 | T51334 | T51344 | T51354 | T51364 | T51374 | T51384 |
| 25 | T51315 | T51325 | T51335 | T51345 | T51355 | T51365 | T51375 | T51385 |
| 37 | T51316 | T51326 | T51336 | T51346 | T51356 | T51366 | T51376 | T51386 |
| 50 | T51317 | T51327 | T51337 | T51347 | T51357 | T51367 | T51377 | T51387 |
| 75 | T51318 | T51328 | T51338 | T51348 | T51358 | T51368 | T51378 | T51388 |
| 100 | T51319 | T51329 | T51339 | T51349 | T51359 | T51369 | T51379 | T51389 |
| kVA | Select Secondary Voltage Below | ||||||
| 277V | 240V | 230V | 220V | 208V | 200V | 190V | |
| 3 | T51390 | T51400 | T51410 | T51420 | T51430 | T51440 | T51450 |
| 5 | T51391 | T51401 | T51411 | T51421 | T51431 | T51441 | T51451 |
| 7 | T51392 | T51402 | T51412 | T51422 | T51432 | T51442 | T51452 |
| 10 | T51393 | T51403 | T51413 | T51423 | T51433 | T51443 | T51453 |
| 15 | T51394 | T51404 | T51414 | T51424 | T51434 | T51444 | T51454 |
| 25 | T51395 | T51405 | T51415 | T51425 | T51435 | T51445 | T51455 |
| 37 | T51396 | T51406 | T51416 | T51426 | T51436 | T51446 | T51456 |
| 50 | T51397 | T51407 | T51417 | T51427 | T51437 | T51447 | T51457 |
| 75 | T51398 | T51408 | T51418 | T51428 | T51438 | T51448 | T51458 |
| 100 | T51399 | T51409 | T51419 | T51429 | T51439 | T51449 | T51459 |
Output Amps
| kVA | Output Amps at: | ||||||||||||||
| 550V | 480V | 460V | 440V | 416V | 400V | 380V | 347V | 277V | 240V | 230V | 220V | 208V | 200V | 190V | |
| 3 | 5.5 | 6.3 | 6.52 | 6.8 | 7.2 | 7.5 | 7.9 | 8.7 | 10.8 | 12.5 | 13 | 13.6 | 14.4 | 15 | 15.8 |
| 5 | 9.1 | 10.4 | 10.9 | 11.4 | 12 | 12.5 | 13.2 | 14.4 | 18.1 | 20.8 | 21.7 | 22.7 | 24 | 25 | 26.3 |
| 7 | 12.7 | 14.6 | 15.2 | 15.9 | 16.8 | 17.5 | 18.4 | 20.2 | 25.3 | 29.2 | 30.4 | 31.8 | 33.7 | 35 | 36.8 |
| 10 | 18.2 | 20.8 | 21.74 | 22.7 | 24 | 25 | 26.3 | 28.8 | 36.1 | 41.7 | 43.5 | 45.5 | 48.1 | 50 | 52.6 |
| 15 | 27.3 | 31.3 | 32.61 | 34.1 | 36.1 | 37.5 | 39.5 | 43.2 | 54.2 | 62.5 | 65.2 | 68.2 | 72.1 | 75 | 79 |
| 25 | 45.5 | 52.1 | 54.35 | 56.8 | 60.1 | 62.5 | 65.8 | 72.1 | 90.3 | 104.2 | 108.7 | 113.6 | 120.2 | 125 | 131.6 |
| 37 | 67.3 | 77.1 | 80.43 | 84.1 | 88.9 | 92.5 | 97.4 | 106.6 | 133.6 | 154.2 | 160.9 | 168.2 | 177.9 | 185 | 194.7 |
| 50 | 90.9 | 104.2 | 108.7 | 113.64 | 120.2 | 125 | 131.6 | 144.1 | 180.5 | 208.3 | 217.4 | 227.3 | 240.4 | 250 | 263.2 |
| 75 | 136.4 | 156.3 | 163 | 170.45 | 180.3 | 187.5 | 197.4 | 216.1 | 270.76 | 312.5 | 326.1 | 340.9 | 360.6 | 375 | 394.7 |
| 100 | 181.8 | 208.3 | 217.4 | 227.3 | 240.4 | 250 | 263.2 | 288.2 | 361.01 | 416.7 | 434.8 | 454.6 | 480.8 | 500 | 526.3 |