Service Entrance Specifications
The ASCO Service Entrance
Automatic Transfer Switch combines automatic power
switching with a utility circuit breaker as a disconnect device. The
power transfer switch meets all National Electrical Code requirements
for installation as service entrance equipment.
The ASCO 300SE Service
Entrance Automatic Transfer Switch uses the same reliable transfer
switching mechanism, and controller as the series 300 product platform
and also includes a utility circuit breaker as a disconnect device.
Suitable for use as
service entrance equipment.
The ASCO Series 300SE
(service entrance) is listed to UL 891 standard for Dead-Front
Switchboards, and meets all NEC requirements for equipment.
Switch is listed to UL 1008 for total system loads.
Sizes available from 150
through 3000 amps.
Available to 600 VAC, 50
or 60Hz, single or three phase.
disconnect on the normal for isolation of transfer switch and other
Disconnect link on
Neutral and Ground.
Silver plated copper
ground and neutral bus.
Solderless screw type
terminals for External Power Connections.
Ground fault trip
protection provided on sizes of 1000 amperes and above.
UL approved Type 1
Available with solid or
Motor load transfer
controls (in-phase monitor) to keep motors operating during
post-transfer load disconnect contacts for signaling motor starters,
elevators, VFDs and other selected loads.
Exerciser for weekly automatic testing of engine generator set with
or without load.
switches for voltage, frequency, time delay settings & additional
Switch position lights,
source availability lights, test switch and time delay bypass
Adjustable time delay to
over ride momentary normal source outages to delay all transfer
switch and engine-starting signals.
Transfer to emergency
time delay. Adjustable from 0 to 5 minutes for controlled timing of
load transfer to emergency.
Retransfer to normal
time delay. Adjustable to 30 minutes.
running time delay for emergency engine generator cool down.
Four-second time delay
to override momentary to ignore momentary voltage and frequency
transients during initial GenSet loading.
VOLTAGE & FREQUENCY
close differential voltage sensing on normal source.
Normal source pickup
voltage is adjustable to 95% of nominal; drop-out is adjustable from
70 to 90% of nominal.
Frequency sensing on
emergency source. Pickup at 95% and dropout at 85% of nominal.
STANDARD CONTROL CONTACTS
indicating contacts (rated 10 amps 250VAC, 32VDC). (1) for Normal
position, (1) for Emergency position.
Gold plated engine start
contacts (rated 5 amps 28VDC or 120VAC).
REMOTE CONTROL FEATURES
Remote test switch.
Remote contact for test
or for peak shaving applications. Circuit will be automatically
bypassed if emergency source fails.
Inhibit transfer to
Remote time delay bypass
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