ASCO 7000 SERIES Automatic Transfer Bypass

ASCO 7000 Series Automatic Transfer
Bypass-Isolation Switches
ASCO Now Offers Drawout
Transfer Switch Design
From 150 to 3000 Amperes
Automatic Transfer BypassIsolation Switches are available in
open transition, closes transition
and delayed transition designs, plus
each configuration is available with
a service entrance rating. The bypass
isolation feature allows the power
transfer switch to be inspected, tested
and maintained without interrupting
power to the load.
The 7000 Series also includes a
Microprocessor Based Controller,
which represents the most
advanced digital based microprocessor control panel in the industry.
It includes, as standard, all of the
voltage, frequency, control, timing
and diagnostic functions required
for most emergency and standby
power applications.
• Draw out design for power
transfer switch for ease of
• Allows bypass-isolation of
transfer switch without load
• Both transfer switch and bypass
switch have identical ratings
• Heavy-duty mechanical interlocks prevent undesirable
• Bypass contacts carry current
only when in bypass mode
• Bypass and isolation handles
are permanently mounted.
The bypass switch has dead
front, quick-make break
operation for transferring loads
between live sources
• Redundant LED’s and mechanical indicators provide
guaranteed indication of transfer and bypass switch positions
• Bypass switch is fully rated for
use as a manual three position
transfer switch for emergency
load transfer when transfer is
isolated for maintenance
• Bypass and isolating function
is simple, requiring a total of
two operating handles. No
toggle switches, push-button
or levers are required for
• UL Listed to 1008 Transfer
Switch Equipment and CSA
Certified to CSA 22.2 No
178-1978 Automatic Transfer
ASCO 7000 Series Automatic Transfer
Bypass-Isolation Switches
Transfer Switch Draw out Features
• Automatic secondary disconnects
remove all control power as transfer
switch is withdrawn
• Draw out carriage provides for easy
transfer switch maintenance
and/or removal
Bypass-Isolation Transfer switch
secondary disconnects
• Self aligning jaws provide positive
connection of bus connection during
reconnection of transfer switch
Bypass-Isolation Transfer Switch
self aligning power jaws
Transfer-Bypass Status Panel
In addition to mechanical indicators to show bypass switch position and
whether the transfer switch is in the connected, test or isolated position, a transfer/bypass LED status panel is also provided.
Eleven LED Indicators embedded on a one-line diagram of the transfer
and bypass contacts, source availability and load connection status :
Bypass Transfer Status Panel
Publication 3096 R3
•Bypass to normal
•Bypass to emergency
•Load connected to normal
•Load connected to emergency
•Transfer switch in connected position
•Transfer switch in test position
•Transfer switch not in automatic (flashing)
•Normal source available
•Emergency source available
•Load connected
•Lamp test button
•Engine start switch for emergency transfer initiation when transfer
switch is isolated or removed for maintenance
800-800-ASCO 50 Hanover Rd, Florham Park, New Jersey 07932 U.S.A
 July, 2008
Printed in the U.S.A.