Medium Voltage Transformer Selection Guide

Medium Voltage Transformer Selection Guide

TEMCo Medium Voltage Isolation Transformers are designed for stepping down incoming higher voltage power to utilize voltages for commercial, institutional, or industrial applications. The NEMA 3R ventilated enclosure makes it suitable 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.

Features

• 1 or 3 Phase
• Copper or Aluminum Wound
• 60 Hz
• NEMA 3R
• 150°C rise
• UL Listed and CSA Certified
• 10 Year Warranty


How to Select a Transformer

Selecting the right voltage transformer is simple. Review the following considerations to determine the best fit for your application. Then, select a transformer from one of the tables below.

Input Voltage

Select a transformer that will operate on the supply voltage available at your facility (Example: 2400V, 4160V, or 7200V). To ensure compatibility, check the wiring diagram by clicking a part number and viewing its product page.

Frequency

All of TEMCo's medium voltage transformers are rated for 60 Hz.

Windings

Copper wound models cost more than the equivalent aluminum wound versions. The primary advantage of copper is its superior corrosion resistance. Copper wound transformers are commonly used for corrosive or high humidity environments like marine applications, and when cost is not a factor.

kVA or Amp Output

Select a transformer with kVA based on your load requirements. It is fine to oversize significantly, but never to undersize for your load. For motor loads, do not exceed 60% of the maximum capacity of the transformer, because electric motors have start up requirements significantly higher than their running requirements.


Product Selection

Below is a list of our full line of medium voltage transformer configurations we offer. First, find the primary voltage you need. Then, click on the primary voltage you need to view the full product selection of secondary voltage configurations.

Transformer sizes offered from 15 to 333 kVA single phase and 15 to 750 kVA three phase.

1 Phase

A. 2400V Primary
kVA Aluminum Copper
600V Sec 480/240V Sec 240/120Sec 600V Sec 480/240V Sec 240/120Sec
15 T57509 T57519 T57529 T38340 T38350 T38360
25 T57510 T57520 T57530 T38341 T38351 T38361
37.5 T57511 T57521 T57531 T38342 T38352 T38362
50 T57512 T57522 T57532 T38343 T38353 T38363
75 T57513 T57523 T57533 T38344 T38354 T38364
100 T57514 T57524 T57534 T38345 T38355 T38365
150 T57515 T57525 T57535 T38346 T38356 T38366
167 T57516 T57526 T57536 T38347 T38357 T38367
250 T57517 T57527 T57537 T38348 T38358 T38368
333 T57518 T57528 T57538 T38349 T38359 T38369
B. 4160V Primary
kVA Aluminum Copper
600V Sec 480/240V Sec 240/120Sec 600V Sec 480/240V Sec 240/120Sec
15 T57539 T57549 T57559 T38370 T38380 T38390
25 T57540 T57550 T57560 T38371 T38381 T38391
37.5 T57541 T57551 T57561 T38372 T38382 T38392
50 T57542 T57552 T57562 T38373 T38383 T38393
75 T57543 T57553 T57563 T38374 T38384 T38394
100 T57544 T57554 T57564 T38375 T38385 T38395
150 T57545 T57555 T57565 T38376 T38386 T38396
167 T57546 T57556 T57566 T38377 T38387 T38397
250 T57547 T57557 T57567 T38378 T38388 T38398
333 T57548 T57558 T57568 T38379 T38389 T38399
C. 7200V Primary
kVA Aluminum Copper
600V Sec 480/240V Sec 240/120Sec 600V Sec 480/240V Sec 240/120Sec
15 T57569 T57579 T57589 T38400 T38410 T38420
25 T57570 T57580 T57590 T38401 T38411 T38421
37.5 T57571 T57581 T57591 T38402 T38412 T38422
50 T57572 T57582 T57592 T38403 T38413 T38423
75 T57573 T57583 T57593 T38404 T38414 T38424
100 T57574 T57584 T57594 T38405 T38415 T38425
150 T57575 T57585 T57595 T38406 T38416 T38426
167 T57576 T57586 T57596 T38407 T38417 T38427
250 T57577 T57587 T57597 T38408 T38418 T38428
333 T57578 T57588 T57598 T38409 T38419 T38429
D. 12.47 kV Primary
kVA Aluminum Copper
600V Sec 480/240V Sec 240/120Sec 600V Sec 480/240V Sec 240/120Sec
15 T57599 T57609 T57619 T38430 T38440 T38450
25 T57600 T57610 T57620 T38431 T38441 T38451
37.5 T57601 T57611 T57621 T38432 T38442 T38452
50 T57602 T57612 T57622 T38433 T38443 T38453
75 T57603 T57613 T57623 T38434 T38444 T38454
100 T57604 T57614 T57624 T38435 T38445 T38455
150 T57605 T57615 T57625 T38436 T38446 T38456
167 T57606 T57616 T57626 T38437 T38447 T38457
250 T57607 T57617 T57627 T38438 T38448 T38458
333 T57608 T57618 T57628 T38439 T38449 T38459

3 Phase

A. 2400V Primary
kVA 600Y/347 V Sec 480Y/277 V Sec 240V Delta Sec 208Y/120 V Sec
Aluminum Copper Aluminum Copper Aluminum Copper Aluminum Copper
15 - T38460 - T38470 - T38480 - T38490
30 - T38461 - T38471 - T38481 - T38491
45 - T38462 - T38472 - T38482 - T38492
75 - T38463 - T38473 - T38483 - T38493
112.5 T38280 T38464 T38286 T38474 T38292 T38484 T38298 T38494
150 T38281 T38465 T38287 T38475 T38293 T38485 T38299 T38495
225 T38282 T38466 T38288 T38476 T38294 T38486 T38300 T38496
300 T38283 T38467 T38289 T38477 T38295 T38487 T38301 T38497
500 T38284 T38468 T38290 T38478 T38296 T38488 T38302 T38498
750 T38285 T38469 T38291 T38479 T38297 T38489 T38303 T38499
B. 4160V Primary
kVA 600Y/347 V Sec 480Y/277 V Sec 240V Delta Sec 208Y/120 V Sec
Aluminum Copper Aluminum Copper Aluminum Copper Aluminum Copper
15 - T38500 - T38510 - T38520 - T38530
30 - T38501 - T38511 - T38521 - T38531
45 - T38502 - T38512 - T38522 - T38532
75 - T38503 - T38513 - T38523 - T38533
112.5 T38304 T38504 T38310 T38514 T38316 T38524 T38322 T38534
150 T38305 T38505 T38311 T38515 T38317 T38525 T38323 T38535
225 T38306 T38506 T38312 T38516 T38318 T38526 T38324 T38536
300 T38307 T38507 T38313 T38517 T38319 T38527 T38325 T38537
500 T38308 T38508 T38314 T38518 T38320 T38528 T38326 T38538
750 T38309 T38509 T38315 T38519 T38321 T38529 T38327 T38539
C. 7200V Primary
kVA 600Y/347 V Sec 480Y/277 V Sec 240V Delta Sec 208Y/120 V Sec
Aluminum Copper Aluminum Copper Aluminum Copper Aluminum Copper
15 - T38540 - T38550 - T38560 - T38570
30 - T38541 - T38551 - T38561 - T38571
45 - T38542 - T38552 - T38562 - T38572
75 - T38543 - T38553 - T38563 - T38573
112.5 - T38544 - T38554 - T38564 - T38574
150 - T38545 - T38555 - T38565 - T38575
225 - T38546 - T38556 - T38566 - T38576
300 - T38547 - T38557 - T38567 - T38577
500 T38328 T38548 T38330 T38558 T38332 T38568 T38334 T38578
750 T38329 T38549 T38331 T38559 T38333 T38569 T38335 T38579
D. 12.47 kV Primary
kVA 600Y/347 V Sec 480Y/277 V Sec 240V Delta Sec 208Y/120 V Sec
Aluminum Copper Aluminum Copper Aluminum Copper Aluminum Copper
15 - T38580 - T38590 - T38600 - T38610
30 - T38581 - T38591 - T38601 - T38611
45 - T38582 - T38592 - T38602 - T38612
75 - T38583 - T38593 - T38603 - T38613
112.5 - T38584 - T38594 - T38604 - T38614
150 - T38585 - T38595 - T38605 - T38615
225 - T38586 - T38596 - T38606 - T38616
300 - T38587 - T38597 - T38607 - T38617
500 - T38588 - T38598 - T38608 - T38618
750 T38336 T38589 T38337 T38599 T38338 T38609 T38339 T38619