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CURRENT FIXED SWITCHES
SERIES
Installation & Operation Instructions
Part # A/CS2, A/CSX2, A/SCS2, A/SCS2-L, A/SCSX2
Phone: 1-888-967-5224
Website: workaci.com
PRECAUTIONS
• This product is not intended to be used for
Life or Safety applications.
FIGURE 1: DIMENSIONS
Solid-Core
2.36” (59.94mm)
• This product is not intended for use in any
hazardous or classied locations.
• The A/CS2 and A/SCS2 Series Current Switches
must be used on Insulated Conductors Only.
2.77”
(70.45mm)
HIGH VOLTAGE
• Disconnect and lock out all power sources
before installation as severe injury or death
may result from electrical shock due to
contact with high voltage wires.
• Never rely on the Red LED to determine
1.03”
(26.16mm)
2.87” (72.80mm)
whether power is present at the current
switch. At very low monitored input currents
the Red LED may not light to indicate the
current is above the trip point.
Split-Core
2.55” (64.69mm)
3.35” (84.99mm)
GENERAL INFORMATION
The ACI Fixed “Status” Current switches are
designed for use in any AC current monitoring
application in which you are looking for a “Go/No
Go” or On/O status for a particular piece of
equipment. The current switches should be
installed on the line side of the power to the motor,
pump, compressor or other equipment. The current
switches are available in both solid and split-core
3.24” (82.23mm)
2.87” (72.77mm)
versions which also includes a Patented 35 mm Din
Rail mounting foot for easy installation in panel
mount applications. The xed current status
switches can also be used to determine the run time
of your equipment and basic load trending
applications where you want to know when your piece of equipment runs and for how long it runs for
when logging the contact closures on your building management system or PLC.
2.77”
(70.35mm)
1.10” (28.02mm)
INSTALLATION
Ensure all installations are in compliance with all national and local electrical codes. Only qualied
individuals that are familiar with codes, standards, and proper safety procedures for high-voltage
installations should attempt installation. The current switches will not require external power because the
power for the current switch is induced from the conductor being monitored.
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Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
Version: 8.0
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The current switch may be mounted in any position
using the two #8 x 3/4” Tek screws and the mounting
holes in the base, or snapped directly on to the 35mm
DIN rail (See Figure 3). Leave a minimum distance of
1” (3 cm) between the current switch and any other
magnetic devices such as contactors and
transformers.
Latch Operation for A/SCS2 Series
Press down on the side tab and swing the top of the
unit up to open the split core current switch as shown
in Figure 2. Press down rmly on the cover to close the
current switch. An audible “click” will be heard as the
tab slides over the tongue on the base.
CAUTION: Mating surfaces of the magnetic core are
exposed when the sensor is open. Electrical contact
grease, present on the cores to prevent corrosion, can
capture grit and dirt if care is not exercised. Operation
can be impaired if anything prevents good contact
between pole pieces. Visually check the mating parts
of the core before closing the current sensor.
LED
The Red LED will indicate whether the current is above
(LED On) or below (LED O ) the xed trip point. At very
low monitored input currents the Red LED may not
light to indicate the current is above the trip point.
FIGURE 3: DIN RAIL INSTALLATION
FIGURE 2: OPENING A/SCS2 SERIES
FIGURE 4: WIRES THROUGH SENSORS
ONE LOOP FOUR LOOPS
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
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Version: 8.0
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APPLICATION NOTES
The conductor being monitored may be looped through the sensor multiple times. The loops increase the
current measured by the current switch. Each time the conductor passes through the current switch window
equals one loop (See Figure 4 p. 2). To determine the proper number of loops required, take the rated Fixed
Trip Point of the current switch and divide it by the Operating Current of the Monitored Device, add one (1),
then round up to the nearest whole number. Example: When using the A/CS2, a small fan operating at 0.1A
should be wrapped through the sensor four times to give you a total operating current of 0.4 Amps owing
through the A/CS2. Formula Example: (0.25A/0.1A) = 2.5 + 1 = 3.5, which rounded up equals 4 loops.
WIRING INSTRUCTIONS
ACI recommends the use of a two conductor 16 to 22 AWG shielded cable or twisted pair copper wire only,
for all current switch applications. A maximum wire length of less than 30 meters (98.4 feet) should be used
between the current switch and the Building Management System or controller.
Note: When using a shielded cable, be sure to connect only (1) end of the shield to ground at the controller.
Connecting both ends of the shield to ground may cause a ground loop. When removing the shield from the
sensor end, make sure to properly trim the shield to prevent any chance of shorting.
The current switch output terminals represent a solid-state switch for controlling both AC and DC loads and
are not polarity sensitive. Tighten the screws at the terminal block connections to the recommended torque
of 0.5 to 0.6 Nm (4.43 to 5.31 in-lbs.). The aperture (hole) size of the current switch is 0.75” (1.90 cm).
FIGURE 5: DIGITAL CIRCUIT
DIGITAL INPUT #1
FIGURE 6: MOTOR/FAN
CONTROL
Range Hood Fan
Motor
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
ACI Split-Core Switch
Neutral
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120 Volt Hot
Relay
Motor
Neutral
Exhaust Fan
BUILDING MANAGEMENT SYSTEM
120 Volt Hot
120 Volt Hot
Neutral
Version: 8.0
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APPLICATION EXAMPLES
See Figure 5 (p.3) and Figure 6 (p.3) for two dierent current switch applications. Figure 5 (p.3) is showing
the use of the Go/No Go Current Switch as a Digital Input to your BAS/PLC Controller. Figure 6 (p.3) shows a
Go/No/Go Current Switch in conjunction with a Contactor to control an exhaust fan.
Note: The ACI Go/No Go Current switches are only rated at 0.2A @ 200 VAC/VDC and must use an additional
Contactor if controlling motor/fans.
TROUBLESHOOTING
PROBLEM
LED is on but the current switch didn’t
activate
LED didn’t turn on and the current switch
didn’t activate
LED not on but the Current Switch is
Activated
Current Switch is operating at a low-level
current or failing to perate withing the
accuracy specications
SOLUTION(S)
Disconnect the wires from the current switch output. Measure the resistance
across the contacts with an Ohmmeter. See Standard Ordering Table (p.5) for
the actual resistance readings for an open or closed switch reading.
Verify that the current owing in the conductor being monitored is above
the xed trip point as listed in the operating specications. If the sensor is
monitoring less than the xed trip point, see Figure 3.
LED not indicating correctly, may have been damaged.
For A/SCS2 Series, visually check the mating parts of the core to ensure there
is no debris between the split contacts. Remove all debris or dust manually
and close the current sensor, see Figure 2. Retest the sensor in your
application.
WARRANTY
The ACI Current Switch Series are covered by ACI’s Five (5) Year Limited Warranty, which is located in the front of
ACI’S SENSORS & TRANSMITTERS CATALOG or can be found on ACI’s website: www.workaci.com.
W.E.E.E. DIRECTIVE
At the end of their useful life the packaging and product should be disposed of via a suitable recycling
centre. Do not dispose of with household waste. Do not burn.
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Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
Version: 8.0
I0000787
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PRODUCT SPECIFICATIONS
SENSOR NON-SPECIFIC INFORMATION
Monitored Current Type:
Maximum AC Voltage:
Operating Frequency Range:
Core Style:
Sensor Power:
Amperage Range:
Isolation Voltage:
Trip Point Style | Trip Point:
Contact Type:
“Status” Contact Rating:
“Status” Contact “On” Resistance |
“O” Resistance:
Status LED Indication :
Aperture Size:
Din Rail Size:
Operating Temperature Range:
Operating Humidity Range:
Wiring Connections:
Wire Size:
Terminal Block Torque Rating:
Minimum Mounting Distance:
Note: The LED should not be used to determine if current is present. At low currents the LED may not be visible
AC Current
600 VAC
40 to 1 kHz
Solid-Core and Split-Core Versions available (See Ordering Grid)
Induced from the Monitored Conductor
See Ordering Grid
2200 VAC
Fixed Trip Point | See Ordering Grid
Normally-Open “N/O” or Normally-Closed “N/C” (See ordering Grid)
0.2A @ 200 VAC/VDC
< 10 Ohms (tripped) | > 1 Meg Ohms (Open)
Red LED (Monitored current is above Trip Point)
0.75” (19.05 mm)
35 mm | (U.S. Patent No. 7,416,421)
5 to 104ºF (-15 to 40ºC)
0 to 95%, non-condensing
2 Position Screw Terminal Block (Not Polarity Sensitive)
16 to 22 AWG (1.31 mm to 0.33 mm) Copper Wires only
4.43 to 5.31 in-lbs. (0.5 to 0.6 Nm)
1” (2.6 cm) between current switch (Relays, Contactors, Transformers)
STANDARD ORDERING
Model #
Item #
A/CS2
A/CSX2
A/SCS2
A/SCSX2
A/SCS2-L
142340
142359
142358
142357
142356
Trip Point Type
Fixed Trip Point
Fixed Trip Point
Fixed Trip Point
Fixed Trip Point
Fixed Trip Point
N/O
N/C
•
Solid-Core
•
•
•
•
Split-Core
•
•
•
•
•
Amp Range
0 to 250A
0 to 250A
0 to 250A
0 to 250A
0 to 250A
Trip Point
0.25A or less
0.25A or less
1.5A or less
1.5A or less
0.5A or less
Contact Rating
0.2A @ 200 VAC/VDC
0.2A @ 200 VAC/VDC
0.2A @ 200 VAC/VDC
0.2A @ 200 VAC/VDC
0.2A @ 200 VAC/VDC
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
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Version: 8.0
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NOTES
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Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
Version: 8.0
I0000787
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NOTES
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Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
Version: 8.0
I0000787
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Automation Components, Inc.
2305 Pleasant View Road
Middleton, WI 53562
Phone: 1-888-967-5224
Website: workaci.com
Page 8
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
Version: 8.0
I0000787
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