Page 14
Time Delays
2C The standard feature one time delay is adjustable
from 0 to six seconds to delay engine starting. If
necessary, extended time delay on engine starting
is available. Adjustable from 0 to 60 min in one
second steps. Factory set at five minutes.
1G Similar to accessory 2C except using 24 volt DC
external input signal.
Manual Controls for Automatic Transfer Switches
6C Reset switch for manual retransfer to normal with
automatic retransfer in the event of emergency
source failure.
6D Selector switch for automatic/manual retransfer to
normal. Automatic bypass if emergency fails.
Engine Generator Controls and Accessories
12 Three position engine control selector switch.
Positions: 1- Stop 2- Automatic 3- Engine Test
Note: Switches with accessory 12 must be labelled as a non-automatic
transfer switch according to UL1008.
Engine controls containing “engine stop” positions should be located at the
engine generator. (Consult ASCO for application assistance.)
Indicators
14A/14B Additional auxiliary contact sets to indicate switch
position. Two sets are standard. Specify total
number of sets if more are required.
18B Two-pole, double-throw contacts operate when
emergency source voltage is present at transfer
switch terminals.
18G Two-pole, double-throw contacts operate when normal
source voltage is present at transfer switch terminals.
99 “Push-to-Test” feature on all pilot light indicators.
Customer Control Circuits
30A Load-shedding circuit initiated by opening of a
customer-supplied contact.
30B Load-shedding circuit initiated by removal of
customer-supplied control voltage. (Specify voltage).
31Z Selective load disconnect control contacts (two
provided) which operate with time delay prior to
and/or after load transfer and retransfer.
43R Terminal block for all customer control connections
on 30-150 amp only (standard on all other sizes).
Neutral Conductor Options
• Solid neutral, with fully-rated terminals. (AL-CU) UL Listed.
• Conventional neutral switching pole.
• Overlapping neutral transfer contacts. Allows for proper
ground-fault sensing and avoids generator voltage
transients during transfer.
Note: Specify neutral option in catalog number, see page 21 for instructions.
Extension Harness
37B
Six foot (6’) extension harness to increase distance between
transfer switch and control panel on open-type units.
Analog Load Metering Options
23B Three phase ammeter with selector switch
(with current transformers and shorting blocks).
24B Three phase voltmeter with selector switch.
Note: Refer to ASCO 7000 Series Data Monitor on page 15 which provides
voltage, frequency and power monitoring.
Serial Communications
72A Serial communication module for remote
communications to ASCO PowerQuest®products.
Surge Protection
ASCO Pulsar 450 rated 40KA
73AC1 Normal source protection. (3Ø, 4wire WYE)
73AC2 Emergency source protection. (3Ø, 4wire WYE)
73AC3 Load side protection. (3Ø, 4wire WYE)
Note: Other distribution voltages available (Contact ASCO).
Special Applications
111A Generator - to - Generator for Standby Applications
111B Generator - to - Generator for Prime Power
Applications
Bypass Isolation Switch Options
14A1 Auy contact to close in “Bypass to Normal” position.
14B1
Auxiliary contact to close in “Bypass to Emergency” position.
14T Auxiliary contact to close when transfer switch is in
“Automatic” position.
14U Auxiliary contact to close when transfer switch is in
“Isolate” position.
14V Auxiliary; contact to close when transfer switch is in
“Test” position.
Note: An externally operable quick-make, quick-break (QMQB), manual handle is available on some 7000 Series product configurations.
(Consult ASCO for guidance.)
7000 Series Optional Accessories
ASCO