Fixed Status Current Switches
Installation and Operation
#NSA-A/CS2, NSA-A/SCS2, NSA-A/SCS2-L
– 11/14/2019
Specifications subject to change without notice.
Catalog No. 11-808-756-01
Page
1
of
7
Overview
The Carrier 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/Off 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 versions which also includes a Patented 35 mm
Din Rail mounting foot for easy installation in panel mount applications. 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 fixed 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.
Applications
: Pump Status, Fan Status, Compressors, Motor Status, Ovens, Industrial Equipment, Lighting Status and
Usage, Electrical Load Status, Local Alarms (Strobes and Audible Alarms)
NOTE
The Fixed Current Switches are not intended to be used in Life / Safety applications or in Hazardous / Classified
locations.
Part Numbers
NSA-A/CS2
NSA-A/SCS2
NSA-A/SCS2-L
Specifications
Monitored Current Type:
AC Current
Maximum AC Voltage:
600 VAC
Operating Frequency Range:
40 to 1 kHz
Core Style:
NSA-A/CS2
: Solid |
NSA-A/SCS2
: Solid |
NSA-A/SCS2-L
: Split
Sensor Power:
Induced from the Monitored Conductor
Amperage Range:
NSA-A/CS2
: 0-250A |
NSA-A/SCS2
: 0-200A |
NSA-A/SCS2-L
: 0-200A
Isolation Voltage:
2200 VAC
Trip Point Style:
Fixed
Trip Point:
NSA-A/CS2
: 0.25A or less |
NSA-A/SCS2
: 1.5A or less
NSA-A/SCS2-L
: 1.5A or less
Contact Type:
Normally open (N/O)
“Status” Contact Rating:
0.2A @ 200 VAC/VDC
“Status” Contact “On” Resistance
“Off” Resistance:
< 10 Ohms (tripped)
> 1 Meg Ohms (Open)
Response Time:
See
Response Time
table below
Status LED Indication
1
:
Red LED (Monitored current is above Trip Point)
Aperture Size:
0.75” (19.05 mm)
Din Rail Size:
35 mm | (U.S. Patent No. 7,416,421)
Operating Temperature Range:
5 to 104ºF (-15 to 40ºC)
Operating Humidity Range:
0 to 95%, non-condensing
Recommended Storage Temp | 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)
