Miniature Adjustable Current Switches
Installation and Operation
#NSA-A/MCS-A, NSA-A/MSCS-A
– 11/14/2019
Specifications subject to change without notice.
Catalog No. 11-808-762-01
Page
1
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5
Overview
The Miniature Adjustable Current switches are designed for use in any AC current
monitoring application in which you are looking for an adjustable current switch to
monitor normal operating conditions, equipment failure or preventative
maintenance scheduling for a particular piece of equipment. The adjustable current
switches should be installed on the line side of the power to the motor, pump,
compressor or other equipment. The miniature adjustable current switches are
available in both solid and split-core versions in a smaller enclosure style than that
of the NSA-A/ACS2 and NSA-A/ASCS2 Series adjustable current switches. The
solid-core versions are a great choice for new installations or OEM applications in
which cost sensitivity, lower trip points and environmental issues may be of
concern. The split-core version of the current switches work great in retrofit
applications and for use in service vehicles since one part will work in most applications and can be installed without
disconnecting any wires. The adjustable current status switches can also be used to determine the run time of your
equipment where you want to know when your piece of equipment runs and for how long it runs when logging the contact
closures on your building management system or PLC.
Applications
: Overload Conditions, Under Load Conditions, Normal Load Conditions, Broken Belts, Belt Slippage, Locked
Rotors, Electrical Failure, Load Status, Local Alarms such as Strobes/Audible Alarms, Pumps, Fans, Compressors,
Lighting Status and Usage Information, Ovens, Process Control, Industrial Equipment, Equipment Maintenance, OEM
Part Numbers
NSA-A/MCS-A
NSA-A/MSCS-A
Specifications
Monitored Current Type:
AC Current
Maximum AC Voltage:
600 VAC
Operating Frequency Range:
50/60 Hz
Core Style:
NSA-A/MCS-A
: Solid |
NSA-A/MSCS-A
: Split
Sensor Power:
Induced from the Monitored Conductor (Insulated Conductors only)
Amperage Range:
Max Sensing Current Voltage: 600 VAC | Max Continuous Current: 158 A
Max Current for 6 Seconds: 204 A | Max Current for 1 Second: 600 A
Isolation Voltage:
2200 VAC
Output Switch Rating
1.00 Amp @ 36 VAC/VDC
Trip Point Style | Adjustable Trip Point Range:
Adjustable Trip Point |
NSA-A/MCS-A
: 0.32
– 150 A
NSA-A/MSCS-A
: 0.70 - 150 A
Hysteresis:
10% Trip Point, typical
Contact Type:
Normally-
Open “N/O”
Contact Rating:
1A Continuous @ 36 VAC/VDC
Contact “On” Resistance | “Off” Resistance:
< 0.5 Ohms (tripped) | > 1 Meg Ohms (Open)
Response Time:
NSA-A/MCS-A
: < 90 mS, typical |
NSA-A/MSCS-A
: < 45 mS typical
Status LED Indication
1
:
Red LED (Current above trip point) | Blue LED (Current below trip point)
Aperture Size (Diameter):
0.53” (13.46 mm)
Operating Temperature Range:
-22 to 140ºF (-30 to 60ºC)
Operating Humidity Range:
0 to 95%, non-condensing
Recommended Storage Temperature | RH Range:
41 to 95°F (5 to 35°C) | 40% to 85% RH, non-condensing
Enclosure Material | Flammability Rating:
PC/ABS (Polycarbonate/ABS Blend) | UL94-V0
Wiring Connections:
2 Position Screw Terminal Block (Not Polarity Sensitive)
Wire Size:
16 to 22 AWG (1.31 mm
2
to 0.33 mm
2
) Copper Wires only
Terminal Block Torque Rating:
4.43 to 5.31 in-lbs. (0.5 to 0.6 Nm)
