The Technipower/General Radio W10MT3A is a portable, enclosed variable autotransformer (Variac) designed for precise AC voltage control in laboratory, test bench, and field service environments. This metered unit delivers continuously variable output from 0 to 140 V AC with a maximum continuous current capacity of 10 A, making it suitable for powering and controlling a wide range of electrical loads. The shielded enclosure protects against dust and incidental contact while integrated voltmeter and ammeter displays enable real-time monitoring. A thermal overload protector and double-pole on-off switch provide circuit safety and load isolation.
Technical Specifications
• Input: 120 V AC, 50/60 Hz (capable of operation up to 400 Hz)
• Output: 0–140 V AC, continuously variable
• Maximum Continuous Current: 10 A at full output voltage
• Power Rating: Approximately 1.5 kVA
• Turns Ratio: 1:40
• Terminals: Combined soldering and screw-type for flexible integration
• Construction: Shielded, single-phase
• Input Connector: Type A plug (standard US outlet)
• Country of Origin: United States
– Key Features
• Front-panel knob for smooth voltage adjustment across full output range
• Integrated dual-meter display (voltmeter and ammeter)
• Thermal overload protection with double-pole on-off switching
• Enclosed gray enclosure for safe operation in shared workshop environments
• Line voltage tolerance to 17% above nominal (up to 140 V on 120 V line)
– Typical Applications
Well-suited for DC motors with rectifiers, universal motors, capacitor motors driving fan loads, resistive heaters, and lighting circuits. Not recommended for smooth speed control of induction motors.
– Compatibility & Integration
Operates on 120 V AC lines at 50/60 Hz. Can function up to 400 Hz. Exposed output terminals accommodate standard load connections with voltage variation control.
