Operator`s manual

Series 300 Non-Automatic Transfer Switching (3NTS)
ASCO non-automatic transfer switches are generally used in applications where operating personnel are available and
the load is not an emergency type requiring automatic transfer of power. They can also be arranged for remote control
via ASCO’s connectivity products.
Fig. 15: ASCO 3NTS 400 Amp
Type 1 Enclosure
3NTS Features:
ASCO Non-Automatic Transfer Switches are electrically held,
manually initiated via soft keys on the user interface panel.
Sizes from 30 through 3000 amps.
Microprocessor based controller provides for addition of
optional accessories.
Controller prevents inadvertent operation under low
voltage condition.
Source acceptability lights inform operator if sources are
available to accept load.
Source inphase monitor to transfer motor loads between
live sources.
One auxiliary contact closed when transfer switch is
connected to normal and one closed on Emergency standard
feature 14A/14B
series 300 Power Transfer Switches
9
3ADTS/3NDTS Features:
Sizes from 150 through 3000 amps.
Reliable field proven dual solenoid operating mechanisms.
Mechanical interlocks to prevent direct connection of both sources.
Adjustable time delay for load disconnect (0 to 5 minutes).
Available in manual operation configuration (3NDTS).
Available with optional load shed feature for (3ADTS).
Series 300 Delayed Transition
Transfer Switching (3ADTS/3NDTS)
ASCO Delayed Transition Transfer Switches are designed to provide transfer
of loads between power sources with a timed load disconnect position for an
adjustable period of time.
Fig. 16: ASCO 3ADTS/3NDTS 400 Amp
Type 1 Enclosure