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Control and Display Panel
l Easy-to-read flush-mounted control and display panel
provides LED indicators for switch position and source
availability. It also includes test and time-delay bypass
switches.
Voltage & Frequency Sensing
l Adjustable three-phase, close-differential voltage sensing
on normal source.
l Normal source pickup voltage is adjustable to 95% of
nominal; drop-out is adjustable from 70% to 90% of nominal.
l Frequency sensing on emergency source. Pickup at 95%
and dropout at 85% of nominal.
Time Delays
l Adjustable time delay to override momentary normal
source outages to delay all transfer switch and engine-
starting signals.
l Transfer to emergency time delay—Adjustable from 0 to 5
minutes for controlled timing of load transfer to emergency.
l Retransfer to normal time delay—Adjustable to 30 minutes.
l Five-minute unloaded running time delay for emergency
engine generator cool down.
l
Four-second time delay to ignore momentary voltage and
frequency transients during initial genset loading.
Standard Selectable Features
l Inphase monitor to transfer motor loads, without any
intentional off time, to prevent inrush currents from
exceeding normal starting levels.
l Engine exerciser to automatically test backup generator
each week Includes control switch for testing with or
without load.
l Selective load disconnect, double-throw contact to operate
at an adjustable 0 to 20 second adjustable time delay prior
to transfer and reset 0 to 20 seconds after transfer.
l 60 Hz or 50 Hz selectable switch.
l Three-phase/single-phase selectable switch.
Remote Control Features
Terminal provisions for connecting:
l Remote test switch.
l Remote contact for test or for peak shaving applications.
Circuit will be automatically bypassed if emergency
source fails.
l Inhibit transfer to emergency.
l Remote time-delay bypass switch.
Series 300 Microprocessor Controller
Fig. 7: ASCO Series 300
Microprocessor Controller
6
Fig. 8: Door-Mounted Control & Display Panel
The ASCO Microprocessor Controller is used with all sizes of Power Transfer Switches. It represents the most reliable
microprocessor controller in the industry and includes, as standard, all of the voltage, frequency, control, timing and
connectivity functions required for most emergency and standby power applications.
13
+
+
++
+
+
+
B
3AUS
400
3
N
1
X
C
+
+
240 V/60
2 poles,
1
3 poles,
3
A
4
B
4
C
D
E
F
H
J
K
L
M
N
Q
R
1
Insert X
If optional
accessories
are required
Type 1
(Standard)
Type 3R
Secured
Enclosure
Type 4
Secured
Enclosure
3
Type 12
Secured
Enclosure
3
Product
A
Solid
Neutral
B
1
Switched
Neutral
Neutral
Code
Phase
Poles
Amperes
Continuous
Rating
Voltage
Code
Controller
11BG
Programmable
Engine Exerciser
14AA/14BA
Auxiliary Contacts
(2 sets)
44G
Strip Heater
w/Thermostat
72A
Communication
Interface Module
73A
Surge
Suppressor
Optional
Accessories
This information
is necessary
to allow correct
control settings
prior to shipment
Specific
Volt & Freq
Options
Enclosure
Blank Open Type
C
M
N
Q
11CD
115
120
208
220
230
240
380
400
415
440
460
480
575
600
To order an ASCO Series 300SE Power Transfer Switch, complete the following catalog number:
Dimensions & Shipping Weights for Series 300SE Transfer Switches
Ordering Information for Series 300SE Transfer Switches
UL Type 1 Enclosure (Dimensional data is approximate and subject to change. Certified dimensions available upon request.)
Switch Rating
amps
Phase
Poles
Neutral
Code
Dimensions
2
, In. (mm)
Width Height Depth
Approx. Shipping
Weight
2
Lb. (kg)
70, 104 ,150, 200, 225
250, 400
600
1
, 800
1
1000
1
, 1200
1
1600
1
, 2000
1
2600
1
, 3000
1
A
B
A
B
A
C
A
C
A
B
A
B
A
B
A
B
A
B
A
B
32 (812)
32 (812)
32 (812)
32 (812)
32 (812)
32 (812)
32 (812)
32 (812)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
38 (965)
50 1/4 (1275)
50 1/4 (1275)
50 1/4 (1275)
50 1/4 (1275)
50 1/4 (1275)
50 1/4 (1275)
50 1/4 (1275)
50 1/4 (1275)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
91 (2310)
13 (330)
13 (330)
13 (330)
13 (330)
13 (330)
13 (330)
13 (330)
13 (330)
28 (711)
28 (711)
28 (711)
28 (711)
48 (1218)
48 (1218)
48 (1218)
48 (1218)
48 (1218)
48 (1218)
60 (1523)
60 (1523)
400 (185)
408 (188)
408 (188)
416 (192)
400 (185)
408 (188)
408 (188)
416 (192)
800 (370)
820 (378)
820 (378)
846 (390)
1085 (501)
1105 (510)
1105 (510)
1134 (523)
2590 (1198)
2640 (1218)
4590 (2118)
4655 (2148)
Note: 1. Unit is designed for top and bottom cable entry for all services and load.
2. Enclosures for 600 – 3000 amps are freestanding.
3. Consult ASCO for type 3R, 4 and 12 enclosure weights and dimensions.
4. When temperatures below 32° F can be experienced, special precautions
should be taken, such as the inclusion of strip heaters, to prevent
condensation and freezing of this condensation. This is particularly
important when environmental enclosures (Type 3R, 4 & 12) are
ordered for installation outdoors. See Optional Accessories page for
space heater options (acc. 44G).
Series 300SE External Power Connections
Sizes UL-Listed Solderless Screw-Type Terminals
Switch Rating
Ranges of AL-CU Wire Sizes
(Unless Specified Copper Only)
Two 1/0 AWG to 250 MCM or One #4 AWG to 600 MCM
Two 1/0 AWG to 600 MCM
Four 1/0 to 600 MCM
Six 1/0 to 600 MCM
Twelve 3/0 to 600 MCM
Twelve 3/0 to 600 MCM
70, 104,
150, 200
*
, 225
250, 400
600
800, 1000, 1200
1600, 2000
2600
3000
Note: All Series 300SE switches are furnished with a solid neutral plate
(unless switched neutral configuration is specified) and terminal lugs.
* 200 amp rated switch for use with copper cable only.
Note: 1. Specify neutral code C for 225, 250 and 400 amperes only.
2. Available 70-1000 ampacity. Use Type 3R for 1200-3000 amp applications.
3. 115-120 volt available 150-400 amps only.
Extended Warranties for Series 300 Transfer Switches
Catalog No. Description
2EXW300SE Two-Year Extended Warranty (Parts & Labor)
3EXW300SE Three-Year Extended Warranty (Parts & Labor)
4EXW300SE Four-Year Extended Warranty (Parts & Labor)
5EXW300SE Five-Year Extended Warranty (Parts & Labor)
3AUS
One #14 to 4/0 AWG
70, 104,
150, 200
2
,
225, 250,
400, 600,
800, 1000,
1200, 1600,
2000
2600, 3000