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Transformers provide stepped down
voltages to machine tool control devices
enabling control circuits to be isolated from
all power and lighting circuits. This allows
the use of grounded or ungrounded circuits
that are independent of the power or lighting
grounds; greater safety is afforded the
operator. The control transformer line is
particularly adaptable on applications where
compact construction is demanded.
Single-Phase Transformers
How to Select Single-Phase Units
- Determine the primary (source) voltage
(the voltage presently available).
- Determine the secondary (load) voltage
(the voltage needed at the load).
- Determine the kVA load:
If the load is defined in kVA, a
transformer can be selected from the
tabulated data. If the load rating is given in amperes,
determine the load kVA from the below
chart. To determine kVA when volts and
amperes are known, use the formula:
kVA = Volts x Amperes/1000
If the load is an AC motor, determine the
minimum transformer kVA from the
chart below. Select a transformer rating equal to or
greater than the load kVA.
- Define tap arrangements needed.
- Define temperature rise. Using the above
procedure, select the transformer from
the listings in this catalog.
SINGLE-PHASE AC MOTORS
| HORSEPOWER | FULL LOAD AMPERES | MINIMUM
TRANSFORMER KVA* |
| 115 VOLTS | 208 VOLTS | 220 VOLTS | 230 VOLTS |
| 1/6 | 4.4 | 2.4 | 2.3 | 2.2 | 0.53 |
| 1/4 | 5.8 | 3.2 | 3.0 | 2.9 | 0.70 |
| 1/3 | 7.2 | 4.0 | 3.8 | 3.6 | 0.87 |
| 1/2 | 9.8 | 5.4 | 5.1 | 4.9 | 1.18 |
| 3/4 | 13.8 | 7.6 | 7.2 | 6.9 | 1.66 |
| 1 | 16 | 8.8 | 8.4 | 8 | 1.92 |
| 1½ | 20 | 11.0 | 10.4 | 10 | 2.40 |
| 2 | 24 | 13.2 | 12.5 | 12 | 2.88 |
| 3 | 34 | 18.7 | 17.8 | 17 | 4.10 |
| 5 | 56 | 30.8 | 29.3 | 28 | 6.72 |
| 7½ | 80 | 44 | 42 | 40 | 9.60 |
| 10 | 100 | 55 | 52 | 50 | 12.00 |
| *If motors are started more than once per hour, increase minimum transformer kVA by 20%. Note: When motor service factor is greater than 1,
increase full load amperes proportionally. Example: If service factor is 1.15, increase above ampere values by 15%. |
FULL LOAD CURRENT IN AMPERES — SINGLE-PHASE CIRCUITS
| KVA | Voltage |
| 120 | 208 | 220 | 240 | 277 | 480 | 600 | 2400 | 4160 |
| 0.25 | 2.0 | 1.2 | 1.1 | 1.0 | 0.9 | 0.5 | 0.4 | 0.10 | 0.06 |
| 0.5 | 4.2 | 2.4 | 2.3 | 2.1 | 1.8 | 1 | 0.8 | 0.21 | 0.12 |
| 0.75 | 6.3 | 3.6 | 3.4 | 3.1 | 2.7 | 1.6 | 1.3 | 0.31 | 0.18 |
| 1 | 8.3 | 4.8 | 4.5 | 4.2 | 3.6 | 2.1 | 1.7 | 0.42 | 0.24 |
| 1.5 | 12.5 | 7.2 | 6.8 | 6.2 | 5.4 | 3.1 | 2.5 | 0.63 | 0.36 |
| 2 | 16.7 | 9.6 | 9.1 | 8.3 | 7.2 | 4.2 | 3.3 | 0.83 | 0.48 |
| 3 | 25 | 14.4 | 13.6 | 12.5 | 10.8 | 6.2 | 5 | 1.2 | 0.72 |
| 5 | 41 | 24 | 22.7 | 20.8 | 18 | 10.4 | 8.3 | 2.1 | 1.2 |
| 7.5 | 62 | 36 | 34 | 31 | 27 | 15.6 | 12.5 | 3.1 | 1.8 |
| 10 | 83 | 48 | 45 | 41 | 36 | 20.8 | 16.7 | 4.2 | 2.4 |
| 15 | 125 | 72 | 68 | 62 | 54 | 31 | 25 | 6.2 | 3.6 |
| 25 | 208 | 120 | 114 | 104 | 90 | 52 | 41 | 10.4 | 6 |
| 37.5 | 312 | 180 | 170 | 156 | 135 | 78 | 62 | 15.6 | 9 |
| 50 | 416 | 240 | 227 | 208 | 180 | 104 | 83 | 20.8 | 12 |
| 75 | 625 | 360 | 341 | 312 | 270 | 156 | 125 | 31.3 | 18 |
| 100 | 833 | 480 | 455 | 416 | 361 | 208 | 166 | 41.7 | 24 |
| 167 | 1391 | 802 | 759 | 695 | 602 | 347 | 278 | 69.6 | 40.1 |
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| MODEL NO. | VA | DIMENSIONS: MM (INCHES) | WEIGHT KG (LBS) | WIRING DIAGRAM |
| HEIGHT | WIDTH | DEPTH |
| C0050E2A | 50 | 65 (2.56) | 76 (3) | 76 (3) | 1.2 (2.6) | 1 |
| C0075E2A | 75 | 65 (2.56) | 76 (3) | 89 (3.5) | 1.6 (3.5) | 1 |
| C0100E2A | 100 | 73 (2.875) | 86 (3.375) | 86 (3.375) | 1.9 (4.2) | 1 |
| C0150E2A | 150 | 81 (3.187) | 95 (3.75) | 102 (4) | 3 ( 6.7) | 1 |
| C0200E2A | 200 | 97 (3.812) | 114 (4.5) | 102 (4) | 3.9 (8.5) | 1 |
| C0250E2A | 250 | 97 (3.812) | 114 (4.5) | 111 (4.375) | 10 (4.5) | 1 |
| C0300E2A | 300 | 97 (3.812) | 114 (4.5) | 121 (4.75) | 5.1 (11.3) | 1 |
| C0500E2A | 500 | 121 (4.75) | 133 (5.25) | 140 (5.5) | 8.7 (19.2) | 1 |
| C0050E2AFB | 50 | 100 (3.937) | 76 (3) | 76 (3) | 1.3 (2.8) | 1 |
| C0075E2AFB | 75 | 100 (3.937) | 76 (3) | 89 (3.5) | 1.7 (3.7) | 1 |
| C0100E2AFB | 100 | 108 (4.25) | 86 (3.375) | 86 (3.375) | 2.0 (4.4) | 1 |
| C0150E2AFB | 150 | 116 (4.562) | 95 (3.75) | 102 (4) | 3.1 (6.9) | 1 |
| C0200E2AFB | 200 | 132 (5.187) | 114 (4.5) | 102 (4) | 3.9 (8.7) | 1 |
| C0250E2AFB | 250 | 132 (5.187) | 114 (4.5) | 111 (4.375) | 4.6 (10.2) | 1 |
| C0300E2AFB | 300 | 132 (5.187) | 114 (4.5) | 121 (4.75) | 5.2 (11.5) | 1 |
| C0350E2AFB | 350 | 132 (5.187) | 114 (4.5) | 133 (5.25) | 6.3 (13.8) | 1 |
| C0500E2AFB | 500 | 156 (6.125) | 133 (5.25) | 140 (5.5) | 8.8 (19.4) | 1 |
| C0050E5E | 50 | 65 (2.56) | 76 (3) | 83 (3.25) | 1.5 (3.4) | 2 |
| C0100E5E | 100 | 81 (3.187) | 95 (3.75) | 143 (5.625) | 2.7 (5.9) | 2 |
| C0150E5E | 150 | 81 (3.187) | 95 (3.75) | 111 (4.375) | 3.6 (7.9) | 2 |
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