What this worksheet captures
This worksheet is built to capture the field details that usually decide whether control transformer sizing can move into a quote, replacement, or engineering review.
It is meant to keep the intake practical, consistent, and easier to hand off between maintenance, engineering, and purchasing.
- primary voltage
- secondary voltage
- steady-state VA
- largest inrush load
- simultaneous loads
When to use it
Use it when the field information is incomplete, when multiple people are touching the job, or when the replacement path depends on details that are easy to miss over email or phone.
Worksheet
Fill this in on-screen or print the page and carry it into the field so the same core details make it back to engineering, sourcing, or quote review.
| Field | Value | Notes |
|---|---|---|
Primary voltage Read the transformer nameplate or published datasheet and record the exact ratings shown there. |
Value
Unit
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Secondary voltage Read the transformer nameplate or published datasheet and record the exact ratings shown there. |
Value
Unit
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Steady-state VA Use the device burden data, coil inrush data, or the control bill of materials to capture the true transformer load. |
Value
Unit
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Largest inrush load Use the device burden data, coil inrush data, or the control bill of materials to capture the true transformer load. |
Value
Unit
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Simultaneous loads Use the device burden data, coil inrush data, or the control bill of materials to capture the true transformer load. |
Value
Unit
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How to use it on site
Work from the installed equipment first, then collect the ratings, environment, fit notes, and related components that change the actual buying decision.
| Item | What it means in practice | Why buyers care |
|---|---|---|
| Core role | Step voltage or current to a usable value for the control or measurement circuit | This tells you why transformers appear in both power and signal discussions. |
| What engineers compare first | primary and secondary values, burden, and protection strategy | Those are the values that change the actual fit. |
| Typical supporting parts | fuses, meters, power supplies, pilot devices, and analog inputs | Transformers sit between the power system and the control system. |
| Common confusion | Selecting by ratio alone and ignoring burden or protection | The ratio is only part of the decision. |
What to verify before sending it on
A worksheet is most useful when the captured values are checked for completeness before they move into sourcing or quote prep.
Important verification notes
Use the worksheet to structure the job, then confirm the final release path against the exact product-family data and installed conditions.