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external interface
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Automatic Transfer Switch
400 amp, 120/240V, 1-phase
generator exerciser


When you require a complete basic automatic transfer transfer switch, we have the solution.  The Milbank Vigilant series is designed to UL 1008 and has all the necessary delay timers, voltage sensing, frequency sensing, and generator programmable exerciser clock.  Made in USA  .

The Vigilant Transfer Switch System. provides automatic transfer of an electrical load to a standby power supply in the event of a drop or loss of voltage, on any or all phases of the normal supply.  Upon restoration of normal power, the electrical load is automatically re-transferred to the normal power supply.  All time delays are built in to the control of the switch and are factory pre-set to simplify installation and startup.

Unique Features
The new redesigned Vigilant series switch has many unique features not available on other switches, or only available with upgraded more-expensive models.  Compare with the competition...

Milbank Vigilant Series... the competition...
* galvanized steel enclosure - better corrosion resistance * painted steel
* voltage and frequency sensing on both sources * no frequency sensing on utility source
* voltage, frequency and time delay settings field adjustable * some settings fixed at factory
* interface on outside of enclosure includes exerciser,
   no need to open door
* must open door to program exerciser
   and perform other functions
* standard 5 year warranty * 1 year warranty standard, extra cost
   for 5 years if available
* normally ships quick from stock * 2-4 week lead time or longer



Switch Current Rating 400 amps, 2 pole
Voltage Rating 120/240V, 1 phase, 60Hz standard (50Hz optional)
Control Features (see note 1)

Setting adjustments made using DIP switches and potentiometers on controller circuit board.  Details contained in Installation & User Manual.

P.U. = pickup
D.O. = dropout
Function Adjustable Range Factory Setting
start time delay 0-32 sec 10 sec
transfer time delay 0-64 sec 10 sec
retransfer time delay 0-256 sec 256 sec
cool down delay 0-256 sec 256 sec
neutral delay (600A switch & above) 0-64 sec 10 sec
voltage sensing of utility 11-18% D.O. above/below
6-13% P.U. above/below
frequency sensing of utility 5-12% above/below 12%
voltage sensing of generator 11-18% D.O. above/below
6-13% P.U. above/below
frequency sensing of generator 5-12% above/below 12%
Exerciser Clock electronic design, field adjustable for 7 day exercising without load transfer
Battery Charger not included (order separately if required)
UL Withstand & Closing Ratings 10,000 Amps (consult factory for specific protective device requirements)
Nominal Dimensions (H x W x D) 48" x 30" x 13"
Weight 190 lbs.
Warranty 5 year factory warranty

1) The start time delay prevents nuisance generator starts during momentary utility power variations; transfer time delay allows generator set to stabilize before load is applied; retransfer delay prevents needless power interruption if return of utility power is momentary; stop delay allows gradual generator set cool down; undervoltage sensing of utility supply provides reliable starting of generator set during brownout conditions.
2) This switch is not service entrance rated.  This generally means that you need a service entrance rated disconnect between this switch and your utility meter.


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