Operator's Manual

ASCO 336 / 337 Operator’s Manual
Page 6 ASCO Power Technologies 381333-427 A
Figure 3. H-design Transfer Switch Maintenance Handle Operation.
Figure 4. G-design Transfer Switch Maintenance Handle Operation.
window
indicators
OPEN or
CLOSED
Generator 2
contacts
Generator 1
contacts
contact position
indicators (left side)
With all power OFF,
grasp handle firmly
with both hands.
Slide the hub onto the
shaft and insert the pin.
Turn counterclockwise
to OPEN contacts.
Turn clockwise to
CLOSE contacts.
Insert handle
into hole
(spring fully
compressed
counterclockwise DOWN
OPENS the contacts
Pull out shaft (upper) to open Gen.
2 source contacts (upper).
Push in shaft (upper) to open Gen.
1 source contacts (lower).
clockwise DOWN CLOSES the contacts
Pull out shaft (upper) to close Gen. 2
source contacts (upper).
Push in shaft (upper) to close Gen. 1
source contacts (lower).
LOWER SHAFT
Generator 1 contacts
UP closes the contacts
DOWN opens the contacts
hub
hub
UPPER SHAFT
Generator 2 contacts
UP opens the contacts
DOWN closes the contacts
Left side of the
transfer switch
Maintenance
handle
clips
Generator 2
contact shaft hub
Hubs shown with
Generator 1 source
contacts open and
Generator 2 source
contacts closed.
Generator 1
contact shaft hub
Window indicators
O is open, C is closed
Gen. 2
contacts
Gen. 1
contacts
Contact position
indicators
(right side)