The Superior Electric 1256D-1677 is a manually operated, single-phase variable transformer delivering continuously adjustable output voltage from 0 to 280 V AC. Part of the POWERSTAT series, this open-construction unit accepts 240 V AC input at 50/60 Hz and supplies up to 28 A for both constant current and constant impedance loads. The transformer features POWERKOTE coils with precious metal-plated commutators, ensuring extended service life, superior environmental resistance, and reliable performance under severe overload conditions. Manual knob control enables smooth, linear voltage adjustment with negligible waveform distortion and high efficiency. Low operating torque and excellent regulation make this transformer ideal for precision voltage control in laboratory, test, and industrial environments where fine-tuned power delivery is essential.
Technical Specifications
• Input: 240 V AC, single phase, 50/60 Hz
• Output: 0–280 V AC, continuously adjustable
• Maximum rated current: 28 A (constant current and constant impedance loads)
• Control: Manual knob operation, clockwise and counter-clockwise rotation
• Mounting: Panel mount with shaft extension
• Weight: 60 lbs
• Waveform distortion: Negligible
• Regulation: Excellent
• Efficiency: High
• Operating torque: Low
– Key Features
• POWERKOTE coils provide extended life, higher current ratings, and resistance to fungus and salt spray
• Precious metal-plated commutator ensures winding integrity under severe overloads
• Linear output voltage characteristic enables precise, repeatable adjustments
• Open construction allows thermal dissipation and component inspection
• Smooth control action with low mechanical resistance
– Typical Applications
• Laboratory voltage regulation and testing
• Equipment commissioning and debugging
• Controlled startup of inductive loads
• Precision power supply applications
• Industrial test and development environments
– Compatibility & Integration
Panel-mounted design with manual control shaft. Direct input from standard 240 V AC, 50/60 Hz single-phase utility supply.
