Control Transformers

QT&E manufactures a wide variety of control transformers used to power low-voltage electronics in circuits such as EMO switches, contactors, etc.

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Technical Capabilities

Power Rating 50VA up to your required power level
Frequency 50/60Hz
Voltages Up to 600V Standard
Other Options Multiple output taps


2kVA control transformer 2kVA Control Transformer
Custom distribution transformer 10kVA Control Transformer
500kVA custom transformer 92VA Control Transformer

2kVA Control Transformer

2kVA control transformer
2kVA control transformer used in semiconductor capital equipment
Power Rating 2kVA
No. of Phases 1
Frequency 50/60Hz
Primary 380/400/415/440/480Vrms
Secondary 1 120Vrms at 1.67Arms
Secondary 2 208Vrms at 8.65Arms
Certifications CE
NRTL to UL 506

10kVA Control Transformer

10kVA control transformer
10 kVA control transformer used in a thermal process system
Power Rating 10kVA
No. of Phases 1
Frequency 50/60Hz
Primary 440/460/480Vrms
Secondary 1 20Vrms @ 1Arms
Secondary 2 110Vrms @ 60 Arms
Secondary 3 120Vrms @ 60Arms
Secondaryv4 230Vrms @ 20Arms
Certifications CE
NRTL to UL 1561

192VA Control Transformer

Angle view of a 500 kVA step-up transformer
Control transformer used in a 3-D printing system
Power Rating 192VA
No. of Phases 1
Frequency 60Hz
Primary 24Vrms
Secondary 24Vrms @ 8Arms
Certifications CE
NRTL to UL 506

Understanding the Control Transformer

The control transformer is typically a smaller isolation transformer with a very specific purpose—“to reduce the line voltage to the value needed to operate control circuits” (, 2013). Commonly, the control transformer is made of two primary windings and one secondary winding creating a 2:1 turns ratio. Generally, the primary windings are rated for 240 V and the secondary is rated for 120 V.

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Works Cited

  •, E. (2013, February 10). Control Transformer. Retrieved March 14, 2014, from Electrical