Q117U-3

The Danaher Q117U-3 is a robust variable autotransformer in the POWERSTAT Transformers series, engineered for three-phase power conditioning in industrial automation environments. As part of the POWERSTAT Transformers family, it employs a Connection Type of #3 3-Phase Wye to maintain a set phase displacement of 120 electrical degrees and ensure balanced load distribution. The transformer is rated for an Input Voltage of 240V at an Input Frequency of 60 Hz, and provides a continuously adjustable Output Voltage range of 0-240V via an integrated brush mechanism. Designed exclusively For Panel Mounting Only, the Q117U-3 supports a Constant Current Load Maximum Ampere of 10 A and a Constant Impedance Load Maximum Ampere of 13 A, with corresponding apparent power capacities of 4.2 kVA and 5.4 kVA respectively. Its three-wire system with no neutral for input/output optimizes space and simplifies wiring in confined control panels.

Performance is enhanced through precisely wound electromagnetic core assemblies, optimized for low hysteresis and efficient magnetic coupling at the specified 60 Hz frequency. Continuous output variation from 0 to 240V is achieved by adjusting the turns ratio with Knob Rotation Clockwise Input settings of 1-1-1 or Knob Rotation Counterclockwise Input settings of 4-4-4, yielding corresponding Knob Rotation Clockwise Output and Knob Rotation Counterclockwise Output positions both set to 3-3-3. These settings enable fine control over voltage stepping for applications such as motor speed regulation and laboratory AC test beds. The robust design ensures minimal eddy current losses and prevents core saturation under nominal operating conditions, preserving transformer efficiency and thermal stability. Large contact surfaces on the brush mechanism reduce wear and maintain consistent electrical contact, ensuring voltage accuracy within tight tolerances.

Reliability is assured through rigorous thermal management that prevents overtemperature when operating at the rated Constant Current Load Maximum Ampere of 10 A or under impedance loads up to 13 A. The panel-mount configuration simplifies integration into industrial enclosures, supporting standardized grounding schemes and uniform wiring layouts. Maintenance is minimized by the durable winding insulation and sealed brush assembly, which resist dust and mechanical vibration common in factory environments. Ideal applications include three-phase motor control, inverter input conditioning, and precision voltage regulation in industrial automation and process control systems. The Danaher Q117U-3 delivers dependable performance and streamlined installation for critical power management tasks.