Three Phase Control Transformer Selection Guide

TEMCo Three Phase Control Transformer Selection Guide

TEMCo industrial control transformers are used to convert all standard international voltages. Many voltage configurations are available in both 50 and 60 Hz. TEMCo's transformers are built to last, guaranteed! That's why we back these with a decade long warranty.

Our industrial control transformers change supply voltages for the operation of components such as contactors, solenoids, relays, and timers. They accommodate momentary current inrush produced when electromagnetic components are energized without compromising secondary voltage stability. Maximum Safety is assured through the secondary control circuit which is isolated from the primary line circuit.

Voltage regulation of TEMCo Industrial Control Transformers exceeds standards recommended by the National Electrical Manufacturers Association. Secondary circuit voltage drop between no-load and momentary overload remains exceptionally low maintaining excellent voltage regulation.

We have the capability to wind your custom control transformer with no penalty for small quantity. Please call us with your requirements for a fast turnaround quote.

Index

Input Voltage

Select a transformer that will operate on the supply voltage available at your facility (Example: 120V, 240V, or 480V). Check the connection diagram, which TEMCo includes on each product page, to ensure compatibility.

Frequency

If you are operating in the United States, you will most likely be operating on 60hz. However should you need a 50hz rated transformer, make sure you are selecting from that section.

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 encouraged to oversize your transformer, but you should never undersize for your load. For motor loads, do not exceed 60% of the maximum capacity of the transformer. This is because electric motors have start up requirements significantly higher than their running requirements. It is OK to oversize significantly, but never to undersize.