Specifications

Automatic Transfer Bypass-Isolation Switching
ASCO Automatic Transfer & Bypass-Isolation Switches are available in
open transition, closed transition and delayed transition designs. The
bypass and isolation features allow power transfer switches to be inspect-
ed, tested, and maintained without any interruption of power to the load.
Fig. 5 Bypass-Isolation Transfer
Switch rated 4 pole 2000 Amperes.
Transfer Switch Drawout Features (1000-2000 amperes)
• Automatic secondary disconnects
remove all control power as switch
is withdrawn.
• Drawout carriage provides for easy
transfer switch maintenance and/or
removal via commercially avail-
able breaker hoists.
• For optional transfer switch lifting
yoke, specify accessory 82B.
• For optional automatic shutters
which close when the transfer
switch is withdrawn to provide bus
isolation, specify accessory 82C.
• Available 150 to 4000 amperes.
• Bypass switch and transfer switch have identical electrical ratings.
• Heavy duty mechanical interlocks prevent undesirable operation.
• Bypass contacts carry current only during bypass mode.
• Allows bypass-isolation without load interruption.
• Transfer switch is drawout design for ease of maintenance.
• Bypass and isolation handles are permanently mounted. The
bypass switch has dead front quick-make, quick-break operation
for transferring of loads between live sources.
• Bypass switch is fully rated for use as a manual 3-position
transfer switch.
• Bypass and isolation functions are simple, requiring a total of two
operating handles.
• No toggle switches, push buttons, selector switches or
levers are required for bypass-isolation operation.
• Mechanical flag indicators show bypass and transfer switch
positions.
Automatic
Secondary
Disconnects
Automatic
Shutters
(optional)
Fig. 6 Bypass-Isolation Transfer
Switch secondary disconnects
and optional automatic shutters.
Page 6
7000 Series Switching Solutions
Self
Aligning
Jaws
Fig. 7 Bypass-Isolation Transfer
Switch Self Aligning
power Jaws.