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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 inspected, tested, and maintained without any interruption of
power to the load.
• Available 150 to 4000 amperes.
• Allows bypass-isolation without load interruption.
• Bypass switch and transfer switch have identical electrical ratings.
• Heavy duty mechanical interlocks prevent undesirable operation.
• Bypass contacts carry current only during bypass mode.
• 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 indicators show bypass and transfer switch positions.
Fig. 5: Three Pole 7000 Series Automatic Bypass-
Isolation Transfer Switch Rated 1000 Amps
Transfer Switch Drawout Features (600-3000 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withdrawn.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 available
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withdrawn to provide bus isolation,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.(1600-3000A
only)
Automatic
Secondary
Disconnects
Automatic
Shutters
(optional)
Fig. 6: Bypass-Isolation Transfer
Switch secondary disconnects and
optional automatic shutters.
Page 6
Self
Aligning
Jaws
Fig. 7: Bypass-Isolation
Transfer Switch self
aligning power jaws.
7000 Series Power Switching Solutions
ASCO