Staco 30M6020-2P Motorized Variac Variable Autotransformer 240V 70A 19.6KVA

Staco 30M6020-2P Motorized Variac Variable Autotransformer 240V 70A 19.6KVA

The Staco 30M6020-2P is a heavy-duty motorized variable autotransformer — commonly called a variac — built for precision AC voltage control in industrial and laboratory environments. It accepts a single-phase 240V AC input and delivers a continuously variable output from 0 to 280V, including a voltage-doubling range above the input voltage, at up to 70 amperes and 19.6 KVA. The integrated motor drive traverses the full wiper range in 30 seconds, allowing remote or automated voltage adjustment without manual intervention. The unit is constructed in an open-frame rack assembly housing two large stacked toroidal autotransformer cores.

Specifications & What's Included

• Model: 30M6020-2P
• Manufacturer Part Number (MPN): 30M6020E-2P
• Type: Motorized Variable Autotransformer (Variac)
• Phase: Single Phase (1φ)
• Input Voltage: Up to 240V AC
• Output Voltage: 0–280V AC (continuously variable)
• Voltage Doubler: Yes (output exceeds input; 0–280V from 240V input)
• Maximum Output Current: 70A
• Power Rating: 19.6 KVA
• Frequency: 50/60 Hz compatible
• Motor Drive Speed: 30 seconds (full wiper travel)
• Enclosure: Open frame rack assembly (no external cabinet)
• Plug & Cord: None — hardwired installation
• Configuration: Two stacked toroidal autotransformer cores, top-shelf control assembly with motor, control transformers, capacitor, relay contactors, and fuse blocks (Staco-branded)
• Origin: Made in USA (Staco Energy Products Co., Dayton, OH)
• Included: Unit only — no cables, external enclosure, or mounting hardware

Applications

Motorized variable autotransformers like the Staco 30M6020-2P are used wherever precise, remotely adjustable AC voltage is required at high current levels. Common applications include burn-in and life-testing of electrical equipment, dielectric and hipot testing, industrial process heating control, motor and generator testing, and laboratory power conditioning. The motorized drive allows the output voltage to be stepped up or down automatically — under PLC, relay logic, or manual switch control — without an operator physically adjusting the unit. The voltage-doubling capability (output above the input line voltage) is particularly useful in testing equipment designed for 240–277V nominal operation from a standard 240V supply. Staco Energy Products, based in Dayton, Ohio, has manufactured variable autotransformers and related power control equipment since the mid-20th century and is a well-established name in the industrial variac market. Units of this size and current rating are typically found in test labs, semiconductor facilities, and industrial manufacturing lines where high-power variable AC sources are a standard part of the test setup.