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100 A Vigilant® Automatic Transfer Switches Single-phase, 120 Vac/240 Vac, NEMA 3R standard

cUL - U.S. Listed

100 A Automatic Transfer Switches

For more automatic transfer switch amperage sizes and model options, contact Ronk.

Features and Benefits

  • Galvanized Corrosion Protection – Standard on all Vigilant enclosures; this duplex coated, galvanized G90 grade steel meets American Society for testing and Materials (ASTM) standard A653, with a service life of more than twice that of regular steel.
  • Exterior Accessibility – The easy-to-use, 7-day exerciser clock gives full control over day and time. The exerciser clock and indicator lamps are both accessible from outside the transfer switch – no need to open the door.
  • Logic Control Board – Located in the center of every Vigilant automatic transfer switch. It provides transfer switch control function with simplicity, flexibility and durability. Features include:
    • Powered from genset battery for isolation against line transients
    • Integrated voltage and frequency sensing
    • Adjustable transfer delays using on-board potentiometers
  • 2-Year Warranty

Owner’s & Installation Manual | Sales Flyer


Series: 100 A & 200 A Ronk Vigilant Automatic Transfer Switches
Model: VTS01001240SX
CB Amperage:
100 A
Voltage: 120 Vac/240 Vac 
Enclosure: NEMA 3R
Dimensions: See drawing below
Poles/Wires: 2-pole/3-wire
Display: External digital display and LEDs
Neutral: Solid
Approximate Weight: 29 lbs.
Wire Range: 1/0-#12 (1-hole lug)
Limited Warranty: 2 years
Order Codes

Enclosure Mounting Dimensions (in inches)

Nema 3R Enclosure Dimensions

100 A & 200 A
VTS01001240SX 16 in. 14 in. 6 in.
VTS02001240SX 24 in. 20 in. 6 in.

Product Nomenclature

Product Nomenclature