ACI-Automation Components A/SCS, A/SCS-L, A/SCSX Instruction Sheet
Installation and Operation Instructions
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Part # A/SCS, A/SCS-L, A/SCSX
Please Read Instructions Carefully Before Installation!
Safety
This product is not intended to be used for Life or Safety applications.
This product is not intended for use in any hazardous or classified locations.
Disconnect and lock out all power sources before installation as severe injury or death may result from electrical
Installation
Make sure that all installations are in compliance with all national and local electrical codes. Only qualified 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, since the power for the current switch is induced from the conductor being monitored.
Warning: Never rely on the Red LED to determine whether power is present at the current switch. The Red LED will
indicate whether the current is above (LED On) or below (LED OFF) the fixed trip point.
The A/SCS Series Current Switches should be used on Insulated Conductors Only! The current switch may be mounted in any
position using the (2) #8 x 3/4” Tek screws and the mounting holes in the base or snapped directly on to the 35mm DIN rail (See
Figures 1 & 2 below). Leave a minimum distance of 1” (3 cm) between the current
switch and any other magnetic devices such as contactors and transformers.
shock due to contact with high voltage wires.
Figure 1: Sensor Placed on Rail Figure 2: Sensor Removed from Rail
Latch Operation:
Pressing down on the two (2) side tabs and swinging the cover open opens the split core current switch as shown in Figure 3
below. Lifting up on the latch with a flat-tip screwdriver as shown in Figure 4 below can also open the unit. Press down firmly 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. Silicone grease, present on the cores to
prevent rust, 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.
Figure 3: Opening Sensor by Hand Figure 4: Opening w/ Screwdriver
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Version : 1.0
For applications in which the normal operating current is below the 2.5A trip point (See Figure 5 below), the conductor being
ACI
A/SCS
Middleton, WI
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ACI
A/SCS
Example: For currents up to 600 Amps
(and not below 70 Amps, where
Current Transformer (C.T.)
secondary falls down to 1 Amp)
use a 600:5 ratio C.T. as shown:
600:5 Ratio 5A C.T.
Nut
Wire
Insulated
Conductor
ACI Model #
Fixed Trip
Point
Output Switch Rating
Max. Sensing
Current Voltage
Max. Continuous
Current
Max. Current for
6 seconds
Max. Current for
1 second
A/SCS
2.50 Amps
0.30Amps @ 200VAC/VDC
600 VAC
200 Amps
400 Amps
800 Amps
A/SCS-L
1.50 Amps
0.30Amps @ 200VAC/VDC
600 VAC
200 Amps
400 Amps
800 Amps
A/SCSX
2.50 Amps
0.15Amps @ 300VAC/VDC
600 VAC
250 Amps
400 Amps
800 Amps
monitored may be looped through the sensor 10 times giving you a total operating current of 10X the original current.
Example: A small fan operating at 0.2A should be wrapped through the sensor 15 times to give you a total operating current of
3.0 Amps flowing through the A/SCS or another option is to use the A/SCS-L.
Figure 5: Wire Through Sensors
For applications in which the normal operating current is greater than 0 to 200 or 0 to 250 (see operating specifications below.)
Amps or for conductor diameters larger than 0.750”(1.90 cm) in diameter, an external 5 Amp Current Transformer must be used
as shown in Figure 6 below.
Remember that the secondary of the 5A CT must be shorted together before the power may be turned onto the monitored device.
Figure 6: Current Transformer
Wiring
ACI recommends the use of a 2 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 A/CS Series current switches
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 so as to prevent any chance of shorting. The current switch
output terminals represent a solid-state switch for controlling both AC and DC loads and is not polarity sensitive. The
recommended torque to be used on the terminal block connections is 0.67 Nm or 5.93 in-lbs. The aperture (hole) size of the
current switch is 0.75” (1.90 cm) and will accept a maximum cable diameter of 350 MCM’s.
Operating Specifications
Version : 1.0
Page 2 of 3 I0000137
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