Q217U-3 by Danaher

The Danaher Q217U-3 autotransformer from the POWERSTAT Transformers series delivers a robust single-phase, variable-voltage solution optimized for demanding industrial automation applications. Designed for 240V, 60Hz single-phase input, the Q217U-3 provides stepless voltage regulation across a 0–240V output range via a precision sliding brush mechanism. This variable autotransformer ensures regulated operation under varying load and input conditions, maintaining output stability without auxiliary electronics. Ruggedly constructed for industrial environments, it combines proven thermal management with a compact form factor suitable for panel mounting. Integrated into automation systems, the Q217U-3 offers reliable, low-noise service for calibration, test, and motor control processes.

Technical specifications define the Q217U-3’s capabilities with precision. The transformer supports a maximum output current of 6.3 amperes under constant-impedance load and 4.0 amperes under constant-current load, while also delivering 7 A at 400 Hz constant impedance and 5 A at 400 Hz constant current for frequency-dependent applications. Input characteristics include 3.9 ohms D-c resistance per coil and no-load loss at 60 Hz of 25.5 watts, reflecting its core and winding efficiency. The unit’s dial graduation in volts and a knob rotation angle of 317.5° enable high-resolution adjustment of output voltage. A reliable frequency range of 60–1500 Hz makes the Q217U-3 suitable for both standard and specialized power sources, while its approximate driving torque of 7.2–9 kpcm (100–125 oz-in) ensures smooth actuation of the adjustment mechanism. Panel mounting is supported by a durable housing, and the overall voltage drop across full load remains proportional to the load to simplify downstream regulation.

Operational features emphasize performance and reliability under continuous use. The autotransformer’s thermal design—including optimized conductor gauge and core cross-section—ensures effective dissipation of heat generated by I²R losses at full load. Constant output voltage behavior reduces the impact of input fluctuations, minimizing voltage ripple and maintaining process integrity for sensitive equipment. The robust brush-and-wiper interface sustains consistent contact pressure over extended service intervals, supporting frequent adjustments without degradation. Users benefit from precise voltage control during startup phases, dynamic load changes, and frequency conversion tasks, with minimal electromagnetic interference and stable magnetic coupling throughout the operating range.

System integration is simplified by the Q217U-3’s compatibility with standard industrial panels and control cabinets, requiring no special drive electronics or external regulators to achieve accurate voltage outputs. Ideal applications include automated test equipment, calibration laboratories, variable-speed motor drives, and high-fidelity power-supply systems where consistent, stepless voltage adjustment is critical. The combination of part_number Q217U-3, manufacturer Danaher, and the POWERSTAT Transformers series designation assures engineers of proven performance in both development and production environments. Its versatile design and comprehensive technical specification set make the Q217U-3 an asset for any industrial automation or metrology application demanding precise AC power control.