Custom transformer engineering · 20 W to 20 kW info@establecorp.com Engineering review available
PRACTICAL GUIDE

Control Transformer Selection Checklist

A concise checklist for panel and machine control transformers with high-inrush loads.

Control load list

  • List every relay, contactor, solenoid, sensor, indicator and control supply.
  • Separate steady-state VA from start-up current and identify devices that energise together.
  • State the minimum acceptable control voltage during the worst-case load event.

Panel conditions

  • Provide available depth, mounting position, terminal access and touch protection.
  • Record ambient temperature, ventilation and nearby heat sources.
  • Coordinate primary and secondary protection with switchgear and wiring.

Approval questions

  • Confirm the destination-market standard and required declarations.
  • Agree labelling, terminal numbering and enclosure requirements.
  • Define the sample tests and production checks.

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