Brochures and Data Sheets

Electrical Features
•UL listed. CSA Approved
•Meets UL 67 requirements
with short-circuit rating
(Withstand Current Rating)
of 22,000 Amps rms sym-
metrical at 480 volts for use
with molded case circuit
breakers; 100,000 Amps
rms symmetrical at 600
volts for use with current-
limiting fuses.
•Interrupts 300% of rated
current at 480 volts, 0.4 to
0.5 power factor
The ASCO 920 is designed
as a feeder disconnect switch
for load capacities beyond
the ASCO 917. ASCO 920
RC switches are available for
separate mounting in NEMA
type enclosures or direct
mounting within lighting
panelboards for total or split-
bus applications.
It is available from 30
through 225 Amperes per
pole with 2 or 3 poles and
service voltages through 600
volts AC. The ASCO 920 is
listed under UL 508 for ballast
lighting, tungsten, general
use and resistive loads. It also
meets the withstand current
requirements of UL 67 for
panelboard applications.
The ASCO 920 is easy to
install and features all posi-
tion mounting, no derating
for high inrush loads and
a reliable single-solenoid
operator. ASCO 920 RC
switches can be used with
energy management systems
which automatically control
lighting and power circuits
through control devices
such as photoelectric cells,
microprocessors, timers and
occupancy sensors.
ASCO 920 Remote Control (RC) Switches
ASCO 920 Features
•Can be used with metal ha-
lide, mercury vapor, quartz
halogen, tungsten and
uorescent lighting.
•No derating when used on
high inrush loads such as
cold tungsten lamps.
•Wide arc gaps and arc split-
ters to quickly extinguish
arcs. Isolated arcing cham-
bers are widely spaced and
symmetrically located.
Construction Features
•Long life. Designed for
more demanding lighting
contactor use. Provides
extended life and quieter
operation.
•Suitable for use with energy
management systems.
•Rugged molded base and
cover with superior electri-
cal insulation.
•Provisions for manual
operation during inspection
and maintenance.
•Lightweight for easy
installation.
•Plug-in auxiliary control
relays available.
•Control line terminal
clamps simplify installation:
Insert wire and tighten.
Wire range #14 AWG to
#10 AWG.
•Contacts are power-driven
in both directions for
complete dependability.
•No extra wires or contacts
needed to install signal
lamps at control stations.
•Can be mounted in any
position.
•Available from stock from
30-225 Amps.
Maximum reliability and excellent value
ASCO 920 Ordering Information
Options
Product
Code
2
3
920
No.
of Poles
Continuous Ampere
Rating
30
60
75
Voltage Code
Voltage
2
Code
110 to 120V
208 to 240V
265 to 277V
440 to 480V
Other
Voltages Up
to 480
3
6
7
9
X
Leave Blank
for No
Options.
“X” Indicates
Options. List
Separately.
See Below.
Enclosures
Leave Blank for
Open - Type.
“C” Indicates
NEMA Type1,
or
Specify Other
Type Required.
1. For DC service, maximum current rating is 75 Amps or switch rating, whichever is less, with maximum voltage rating of 125 volts when connected 1 pole to load and 250
volts when connected 2 poles to the load.
2. All at 50 or 60 Hz. For voltages other than those listed, and for DC applications, contact your nearest ASCO source.
3. Specied only when ASCO 920 is to be mounted within a panelboard. A sub-panel is required when mounting in NEMA type enclosures
AC/DC
1
AC
100
150
200
225
Sub-Panel
0 = No
3
Sub Panel
1= Sub-Panel
Example: The catalog number for an ASCO 920, 3-pole, 225-amp switch with a
control coil voltage of 277 volts, 60 Hz, with an Optional Accessory 48 and a sub-panel, in a
NEMA Type 1 enclosure is: 920322571XC with option 48A(120V)
Option Description
Auxiliary contacts, one normally open and one normally
closed. Supplied as a pair. Rated 10 amps at 480 VAC.
Fully-rated neutral plate
Auxiliary control relay for 2-wire control
Auxiliary control relay for 3-wire control
Auxiliary control relay for Form 3 control
Control line fuse:
For grounded control voltage (to 300V)
For ungrounded control voltage (to 300V)
For ungrounded control voltage (301 - 600V)
Optional Accessories
1. A maximum of one pair of optional 14A and 14B contacts can be supplied on the above indicated remote
control switches.
2. The Amperage of the neutral plate will be equal to the Amperage of the specied remote control switch.
Lugs capable of accommodating the same cables as a single main pole are provided.
3. When ordering specify desired control voltage. See next page for control voltages.
4. Control line fuses can be used to supply power from the remote control switch enclosures to external
control stations. Any incoming service or control power should have appropriate overcurrent protection
at their source as required by application codes. For a grounded control voltage, one fuse should be
ordered; for an ungrounded control voltage, two fuses should be ordered.
5. Shipped loose for open types. Installed for enclosed types.
6. U.L. recognized.
1
2
3,5,6
3,5,6
3,5,6
4,5
Specify Option
14A and 14B
22
47
48
49
52A
52B
52C
ASCO 920 Optional Auxiliary Control Relays
•Allows control of RC
switches directly from
energy management
systems.
•UL recognized for use with
ASCO RC switches.
•Permits low voltage AC or
DC normal.
•Low VA burden.
•Narrow width design.
•Incorporates ASCO 115
relays.
Features
•Polycarbonate dust cover
for protection against
industrial environment.
•Barrier screw type terminals
with approved means for
solderless connection of
conductors.
• When the controlling device does not
have adequate current-carrying capacity
to directly control the RC switch.
• When the control station is to be located at a
distance greater than the allowable RC switch
line run.
• When the controlling device is only available
as a single pole, single throw contact,
necessitating a two-wire control line.
• When Form 3 (start-stop) control for an RC
switch is required.
Auxiliary Control Relays to Operate
RC Switches are useful when:
Rating Accessory 47
Nominal AC
Pickup Voltage AC
Nominal DC
Pickup Voltage DC
Maximum Voltage
Operating Coil Characteristics
Accessory 48
3.0 VA
85% of Nominal
2.5 Watts
80% of Nominal
120% of Nominal
2.0 VA
85% of Nominal
1.2 Watts
75% of Nominal
120% of Nominal
Height Width
6-1/2”
165 (mm)
Dimensions inches (mm) for ASCO
two-wire and three-wire Control Relays
1
Depth
2”
51 (mm)
3-3/8”
86 (mm)
Two-Wire Control Accessory 47
Catalog No. 321A40
ASCO relay for two-wire control.
Standard Control Voltages:
24,120, 208, 240, 277VAC,
50 or 60Hz, 24 or 110VDC
Three-Wire Control Accessory 48
Catalog No. 321A36
ASCO relay for three-wire control.
Standard Control Voltages:
24,120, 208, 240, 277VAC,
50 or 60Hz, 12, 24, 32, 48
or 110VDC
The largest service
organization of its kind
Creative, responsive, customer - focused and competitive.
ASCO 920 Remote Control Switch
in Type 1 Enclosure
Accessory 47
Accessory 48
Two-wire
relay control
of a remote
control switch
Three-wire
relay control
of a remote
control switch
ASCO 920 Remote Control Switch
with sub-panel
See Notes
1. Dimensional data is approximate and subject to change.
Certified dimensions available upon request.