 A broad range of AC
and DC current sensing devices with a variety of AC and DC
contacts. Available with fixed and
adjustable setpoints for underload and overload detection.
|
Model |
Ranges |
Switch Type |
Output |
Data Sheets |
Application, Features
& Specs |
| AS1 Series |
1-150A |
AC Sensing |
N.O. & N.C. |
pdf
|
Specs |
| ASM Series |
1.5 to 0-150A |
AC Sensing |
Self-calibrating
N.O. |
pdf
|
Specs |
| AS3 Series |
1-6 to 40-175A |
AC Sensing |
3 selectable ranges |
pdf
|
One Pole
Specs
Two Pole Specs
|
| ASX Series |
2-12 to 50-200 |
High Performance AC
Sensing |
3 selectable ranges |
pdf
|
Specs |
| ASXP
Series |
1-20 or 20-50 |
High Performance AC
Sensing |
SPST Relay |
pdf |
Specs |
| AM
Series |
1-6 to
100-200 |
Delay
for over or undercurrent conditions |
N.O. &
N.C. |
pdf |
Specs |
| AS0 Series |
3-350 mA |
Low Current
AC Sensing |
N.O. & N.C. |
pdf
|
Specs |
| DS3 Series |
4-20 to 15-100A |
DC Sensing |
Hall effect technology |
pdf
|
Specs |
 ‘AS1’ Current Switches from NK
Technologies combine a current transformer, signal conditioner
and limit alarm into a single package. The AS1 series has an
extended current input range, universal solid-state outputs
and a wide frequency response. Available in a split core case
or two styles of solid core cases.
- Electronic Proof Of Flow
— No need for pipe or duct penetrations.
— More reliable than electromechanical pressure or flow
switches.
- Conveyors
— Detects jams and overloads
— Interlocks multiple conveyor sections
- Lighting Circuits
Easier to install and more accurate than photocells.
- Electric Heaters
Faster response than temperature sensors.
- Universal Output
— Solid state switch N.C. or N.O. works on AC or DC to
240VAC.
— Compatible with any automation system.
— Reduces inventory, installation and engineering costs.
- Self-powered
Cuts installation and operating costs.
- Easily Adjustable Setpoint
Speeds startup
- Solid or Split Core Case
Choose the right version for each installation.
- Built-in Mounting Bracket
Provides the solid installation inspectors want.
- UL, CUL and CE Approval
Accepted worldwide.
| Power Supply |
None — Self-powered |
| Output |
Magnetically Isolated Solid-State
Switch |
| Output Rating |
• N.O. Version: 0.2A @ 240VAC or VDC
• N.C. Version: 0.2A @ 130VAC or VDC
• Not polarity sensitive |
| Off State Leakage |
None |
| Response Time |
0.120 Second
Minimum |
| Setpoint Range |
• Fixed Core: 1–150A
• Split Core: 1.5–150A |
| Hysteresis |
5% of Setpoint |
| Overload |
| Model |
Continuous |
6 Sec |
1 Sec |
| • –GO |
250A |
500A |
1,000A (NOU) |
| • –GO |
150A |
400A |
1,000A (NCU) |
| • All Other |
150A |
400A |
1,000A |
|
| Isolation Voltage |
UL Listed to 1,270VAC, tested to
5,000VAC |
| Frequency Range |
6–100Hz |
| Sensing Aperture |
• –FF Case : 0.55" (14mm) ID.
• –FT Case : 0.75" (19mm) ID.
• –SP Case : 0.85" (21.5mm) sq. |
| Case |
UL 94V-O Flammability rated |
| Environmental |
–58 to 149°F (–50 to 65°C),
0–95% RH, non-condensing |
| Listings |
UL 508 Industrial Control Equipment
(USA & Canada), CE |
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‘ASM’ Current Switches from NK Technologies
combine a current transformer, signal conditioner and
self-calibrating limit alarm into a single package. The ASM
Series has an extended current input range, universal
solid-state outputs and a wide frequency response. Available
in a split core or top terminal solid core case.
- Conveyors (–OL option)
— Detects jams and overloads.
— Interlocks multiple conveyor sections.
- Electronic Proof of Flow (–UL
option)
— No need for pipe or duct penetrations.
— More reliable than electro-mechanical pressure or flow
switches
- Lighting or Heating Circuits (–UL
option)
Fast and easy installation.
- Pump Protection (–OU option)
Provides overload (jams) and underload (suction loss)
indication.
- Self Calibrating Switch
Speeds startup.
- Self-powered
Cuts installation costs.
- Choose the Operating Style that
Matches your Application
- Status alarms on underload, proving
that equipment is running properly.
- Overload protects
against jams and blockages.
- Operating window provides both status and overload in a
single device.
- Universal Output
AC or DC switching means compatibility with any automation
system.
- Compact
Fits in starters and panels.
- UL, CUL and CE Approval
Accepted worldwide.
| Power Supply |
None — Self-powered |
| Output |
Magnetically Isolated
Solid-State Switch |
| Output Rating |
• N.O. Version: 0.2 A @
240VAC or VDC
• Not polarity sensitive |
| Off State Leakage |
<10 microamps
|
| Response Time |
0.2 Second |
| Setpoint Range |
• 2.5–150A (Fixed
Core)
• 2.8–150A (Split Core) |
| Setpoint |
• Overload : +15% of
Load (–OL)
• Underload: –15% of Load (–UL)
• Operating Window: +/–15% of Setpoint |
| Hysteresis |
5% of Setpoint |
| Overload |
Model
|
Continuous |
6 Sec |
1 Sec |
| All |
150A |
500A |
1,000A |
| Isolation Voltage |
UL Listed to 1,270VAC,
tested to 5,000VAC |
| Frequency Range |
6–100Hz |
| Sensing Aperture |
• –FT Case: 0.75"
(19 mm) ID
• –SP Case: 0.85" (21.5mm) sq. |
| Case |
UL 94V-O Flammability
rated |
| Environmental |
–58 to 149°F (–50 to
65°C),
0–95% RH, non-condensing
|
| Listings |
UL 508 Industrial Control
Equipment
(USA & Canada), CE (Pending)
|
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‘AS3’ Current Switches from NK Technologies
combine a current transformer, signal conditioner and a limit
alarm into a single package. The AS3 Series has three jumper
selected current input ranges, solid-state AC or DC output and
a wide frequency range. Available in a split core or front
terminal solid core case.
- Electronic Proof of Flow
— No need for pipe or duct penetrations.
— More reliable than electro-mechanical pressure or flow
switches.
- Conveyors
— Detects jams and overloads.
— Interlocks multiple conveyor sections.
- Lighting Circuits
Easier to install and more accurate than photocells.
- Electric Heaters
Faster response than temperature sensors.
- Choice of Outputs
— Solid state switch N.C. or N.O.
— 1A @ 240VAC or 0.150 A @ 30VDC
— 0.150 A @ 240VAC or DC (NO) 135VAC/DC (NC)
- Self-powered
—Cuts installation and operating costs.
- Adjustable Setpoint
—Speeds startup.
- Solid or Split Core Case
—Choose the right version for each installation.
- Built-in Mounting Bracket
—Provides the solid installation inspectors want.
- UL, CUL and CE Approval
—Accepted worldwide.
| Power Supply |
None — Self-powered |
| Output |
Isolated Solid State Switch |
| Output
Rating Max. |
1.0A @ 240VAC (AC Units),
0.15A@30VDC (DC Units)
15A @ 120VAC, 10A @ 240VAC (–15 Option) |
| Off State Leakage |
• NOAC: <10 microamps NODC
<10 microamps
• NCAC:
2.5mA
NCDC 1.4 mA
• AADC: <10 microamps CCDC 0.3 mA
(NC term) |
| Response Time |
0.04 to 0.120 Second |
| Setpoint Range |
• Fixed Core: 1–6, 6–40 & 40–175A
• Split Core: 1.5–6, 6–40 & 40–200A
Note: -15 option, AADC and CCDC available solid core ONLY |
| Hysteresis |
5% of Setpoint |
| Overload |
| Range |
Continuous |
6 Sec |
1 Sec |
| • 1–6A |
150A |
400A |
600A |
| • 6–40A |
150A |
500A |
800A |
| • 40–175A |
210A |
800A |
1,200A |
|
| Isolation Voltage |
UL listed to 1,270VAC, tested to
5,000VAC |
| Frequency Range |
6–100Hz, works on VFDs |
| Sensing Aperture |
• –FF Case: 0.55" (14mm) ID.
• –SP Case: 0.85" (21.5mm) sq. |
| Case |
UL 94V-O Flammability Rated |
| Environmental |
–58 to 149°F (–50 to 65°C),
0–95% RH, non-condensing |
| Listings |
UL 508 Industrial Control Equipment
(USA & Canada), CE |
| Multi-pole Version (see
below for description): |
| Switch Rating |
0.15A @ 30VDC
|
| Off State Leakage |
• AADC: <10 microamps
• CCDC: 0.3mA (NC terminal only) |
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NK manufactures current switches that are a multi-pole version of the popular
AS3 Series. The AS3 Series combines a current transformer,
signal conditioner and two limit alarms into a single package.
The AS3 Series has three jumper-selected current input ranges,
solid-state DC output and a wide frequency range.
Available in a front terminal solid core case.
- Multi-pole Output, <30VDC control only
—Monitor two setpoints with one sensor.
- Self-powered
—Cuts installation and operating costs.
- Easily Adjustable Setpoints
—Speeds startup.
- Solid Core Case Only
—Choose the right version for each installation.
- Built-in Mounting Bracket
—Provides the solid installation inspectors want.
- UL, CUL and CE Approval
—Accepted worldwide.
- Pump Control
Individually adjustable indication of overload (jam) and
underload (suction loss).
- Dual Alarm
Easy setup for dual level alarms.
| See "AS3
Series" specifications and dimensional drawings
Multi-pole switches are available
solid core only, DC switch capacity only
|
| Switch Rating |
0.15A @ 30VDC |
| Off State Leakage |
• AADC: <10 microamps
• CCDC: 0.3mA (NC terminal only) |
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‘ASX’ Current Switches from NK Technologies
combine the universal output contact of the AS1series, and add
the ability to change ranges with a jumper. The ASX Series is
designed to provide a very precise set point adjustment, with
constant hysteresis. Available in top terminal solid core or
split core housings. Each model has a delay before action
feature, allowing the contact to stay in the
"shelf-state" condition during start up, and during
momentary overload conditions.
- Electronic Proof of Flow
— No need for pipe or duct penetrations.
— More reliable than electro-mechanical pressure or flow
switches.
- Conveyors
— Detects jams and overloads.
— Interlocks multiple conveyor sections.
- Small Motor Loads
Reacts to small changes in current with constant
hysteresis
- Interlocking Machines
Keeps all machines working together without extra wiring,
even during low voltage episodes.
- Choice of Outputs
— Solid state switch N.C. or N.O.
— 1A @ 240VAC or 0.150 A @ 240VAC/DC
- Self-powered
—Cuts installation and operating costs.
- Adjustable Setpoint and Time Delay
—Speeds startup, allows for momentary overcurrent
conditions.
- Solid or Split Core Case
—Choose the right version for each installation.
- Built-in Mounting Bracket
—Provides the solid installation inspectors want.
- UL, CUL and CE Approval
—Accepted worldwide.
| Power Supply |
None — Self-powered |
| Output |
Isolated Solid State Switch |
| Output Rating Max. |
1.0A @ 240VAC (AC Units), or
0.15A@240VAC/DC
|
| Off State Leakage |
• NOAC: <10 microamps
• NCAC: < 10
microamps
• NOU/NCU negligible |
| Response Time |
adjustable 0.2 to 15 Second |
| Setpoint Range |
• Fixed Core: 1.5–12, 12–55
& 50–200A
• Split Core: 2–12, 12–55 & 50–200A
|
| Hysteresis |
5% constant |
| Overload |
| Range |
Continuous |
6 Sec |
1 Sec |
| • 2–12A |
150A |
400A |
600A |
| • 12–55A |
150A |
500A |
800A |
| • 50–200A |
210A |
800A |
1,200A |
|
| Isolation Voltage |
UL listed to 1,270VAC, tested to
5,000VAC |
| Frequency Range |
50-100 Hz |
| Sensing Aperture |
• –FT Case: 0.75" (14mm) ID.
• –SP Case: 0.85" (21.5mm) sq. |
| Case |
UL 94V-O Flammability Rated |
| Environmental |
–58 to 149°F (–50 to 65°C),
0–95% RH, non-condensing |
| Listings |
UL 508 Industrial Control Equipment
(USA & Canada), CE |
‘ASXP’ Current Switches
from NK Technologies take our current operated switch
selection to the next level. The ASXP Series has two
models with different current input ranges. Utilizing a
separate power source, either 120 or 24 VAC or DC, this
product provides an SPST relay output rated at 10 amps. There
is a factory set delay upon initial current inrush, allowing a
simple connection to common controls without sensor actuation.
The trip point can then be adjusted between 1 and 20 amps
(ASXP1) or between 20 and 50 amps (ASXP2). Both models have
adjustable delay before the relay energizes, up to 15 seconds,
to allow for brief periods of over current conditions.
- Conveyors
Use as electronic shear pins
- Overhead Hoists
Alarms when hoist is overloaded
- Machine Operation
Instant status of motors, lamps and other loads.
- Undercurrent Conditions
Alarm when belts or couplings break
- Compact, One-piece Design
—Fits in crowded motor starters, power supplies and
control panels.
- Input Isolation
—Much simpler than CTs, signal conditioners and timing
relays
- Ranges Accommodate Most Common Motors
—Single range can simplify installation
- Tough
—Designed to handle harsh industrial environments.
- Motor Current Inrush Bypass Standard
— Two seconds before switch output changes after initial
startup
- Built-in Mounting Bracket
—Solid, secure mounting that inspectors want to see.
- Dial Indication of Trip Point and
Time Delay Settings
| Output |
Isolated dry contact |
| Output Rating |
• Relay: 10.0A @ 240VAC |
| Off State Leakage |
None - Electromechanical relay |
| Response Time |
• 100mS (10% above Setpoint)
• Adjustable delay to 15 seconds |
| Setpoint Range |
1-20 or 20-50 amps |
| Hysteresis |
5% (Constant) |
| Overload |
• 500 amps (5 seconds) |
| Isolation Voltage |
1.25 kV |
| Frequency Range |
6-100Hz |
| Sensing Aperture |
0.75" (19mm) diameter |
| Power Supply |
120 or 24 VDC or VAC |
| Power Consumption |
3VA |
| Case |
UL 94V-0 Flammability rated |
| Environmental |
• –4 to 122°F (–20 to 50°C), 0–95%
RH, non-condensing |
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‘AM’ Current Switches
from NK Technologies take our current operated switch
selection to a refined level. The AM Series
is available three
models with different current input ranges. Utilizing
the monitored current as a power
source, this
product provides an AC solid state output
rated to one amp, up to 240 VAC; or a solid state output
that can control up to 150 mA, up to 30 VDC.
This sensor series can be
produced so that the output changes only on current increase
over the setpoint, or only on current decrease, or both over and
under current conditions.
With the overload only
models, there
is an adjustable
delay upon initial current inrush, allowing a
simple connection to common controls without sensor actuation.
The sensor output will change when the
monitored circuit rises above a "floor" value of approximately
one amp. The trip point can then be adjusted between 1 and
6 or 6 to 12 amps
(AM1), between 12
and 25 or 25 and 50 amps (AM2) or between
50 and 100 amps
or 100 and 200 amps (AM3).
All models have two
adjustable delays before the
output changes, up to 10 seconds.
The first delays output during initial current inrush, and the
second delays to allow for brief periods of over current conditions.
With the underload only
models, there
is an adjustable
delay upon initial current inrush, allowing a
simple connection to common controls without sensor actuation.
The sensor output will change when the
monitored circuit rises above a "floor" value of
approximately one amp. The trip point can then be adjusted between 1 and
6 or 6 to 12 amps
(AM1), between 12
and 25 or 25 and 50 amps (AM2) or between
50 and 100 amps
or 100 and 200 amps (AM3).
All models have
two adjustable delays
before the output
changes, up to 10 seconds.
The first delays output during initial current inrush, and
the second delays to allow for brief periods of over current conditions.
With the over/under
models, there is one delay adjustable for over current, and
the second for under current conditions.
The sensor output will change when the
monitored circuit current rises above the "low" setpoint,
and will stay in that condition until the current exceeds
the "high" setpoint. The trip points can then be adjusted between 1 and
6 or 6 to 12 amps
(AM1), between 12
and 25 or 25 and 50 amps (AM2) or between
50 and 100 amps
or 100 and 200 amps (AM3).
- Compact, One-piece Design
—Fits in crowded motor starters, power supplies and
control panels.
 -
Input Isolation
—Much simpler than CTs, signal conditioners and timing
relays
- Ranges Accommodate Most Common Motors
—Dual ranges
will allow use
on many loads
- Tough
—Designed to handle harsh industrial environments.
- Motor Current Inrush Bypass Standard
— Adjustable delay before switch output changes after initial
startup
- Built-in Mounting Bracket
—Solid, secure mounting that inspectors want to see.
| Output |
• Isolated
solid state contact |
| Output Rating |
• AC Models: 1.0A @ 240VAC •
DC Models:
0.15A @ 30VDC |
| Off State Leakage |
• AC: 3 ma @
120 VAC •
DC (NO): 1.1 mA @ 30 VDC, (NC) 1.4 mA @ 30 VDC |
| Response Time |
• 120mS (10% above Setpoint)
• Adjustable delay to 10 seconds |
| Setpoint Range |
• 1-6
& 6-12, 12-25 & 25-50 or 50-100
& 100-200 amps |
| Hysteresis |
•5% average across
range |
| Overload |
• 500 amps (5 seconds) |
| Isolation Voltage |
1.25 kV tested to 5
kV |
| Frequency Range |
• 6-100Hz |
| Sensing Aperture |
• 0.75" (19mm) diameter |
| Power Supply |
• self powered from
monitored circuit |
| Overhang time |
• 0.50 seconds
(time contact remains tripped after current decreases) |
| Case |
• UL 94V-0 Flammability rated |
| Environmental |
• –5 to 158°F (–15 to
70°C), 0–95% RH, non-condensing |
| Listings |
• –UL
Listed 508, C-UL and CE Certified |
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‘DS3’ Current Switches from NK Technologies combine
a Hall effect sensor, signal conditioner and a limit alarm
into a single package. The DS3 Series has three jumper
selected current input ranges and frequency response from DC
to 400Hz. Available in a top terminal solid core case with
either a relay output or a universal solid state output.
- Interlocking motor controls without aux.
contacts
- Power Supplies
Signals over-current before equipment
fails.
- Machine Operation
Instant status of motors, lamps and other loads.
- Telecom Sites
Monitors battery output.
- Shunt Wound DC Motors
Monitor the field windings to keep speed regulation under
control
- Compact, One-piece Design
Fits in crowded motor starters, power supplies and control
panels.
- Input Isolation
Much safer than shunt/relay combinations.
- Output Installation
Isolated output greatly simplifies wiring.
- Tough
Designed to handle harsh industrial environments.
- Adaptive Hysteresis
— Hysteresis is 5% of setpoint.
— Allows closer control than fixed hysteresis.
- Reliable
Solid state design, or electromechanical relay output.
- Built-in Mounting Bracket
Solid, secure mounting that inspectors want to see.
| Output |
Isolated dry contact |
| Output Rating |
• Solid State: 0.2A @ 240VAC/DC
(N.O. Only)
• Relay: 5.0A @ 240VAC, 5.0A @ 30VDC (SPDT) |
| Off State Leakage |
<10 microamps (solid state) |
| Response Time |
• 100mS (10% above Setpoint)
• 20mS (100% above Setpoint) |
| Setpoint Range |
4–20, 10–50 and 15–100A (DC)
Jumper select (derate by ÷2 for AC) |
| Hysteresis |
5% of Setpoint |
| Overload |
• Unaffected
by sustained monitored current overloads |
| Isolation Voltage |
3kV |
| Frequency Range |
DC to 400Hz |
| Sensing Aperture |
0.75" (19mm) diameter |
| Power Supply |
20–28VDC or VAC |
| Power Consumption |
3VA |
| Case |
UL 94V-0 Flammability rated |
| Environmental |
• –4 to 122°F (–20 to 50°C), 0–95%
RH, non-condensing
• –40 to 140°F (–40 to 60°C) (Solid State Output
Only) |
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‘AS0’ Current Switches from NK Technologies
can be set to trip at any current level
between 3 mA and 350 mA. NK has also made this sensor
with trip points up to 1000 mA, so if you need a very fast
operating, UL Listed current operated switch, let us know.
This sensor can also be used in Canada as a ground fault
sensor, due to the third party recognition issues with our
AG series. NK makes models with normally open outputs
(closing with current over the set point), and also with
normally closed outputs (opening with current over the set
point. The solid state output can be ordered to control up
to one amp of AC current, up to 240 VAC, or with DC outputs
capable of switching up to 0.15 amp up to 30 VDC.
- Interlocking motor controls without aux.
contacts
- Power Supplies
Signals over-current before equipment
fails.
- Machine Operation
Instant status of motors, lamps and other loads.
- Telecom Sites
Monitors battery output.
- Shunt Wound DC Motors
Monitor the field windings to keep speed regulation under
control
- Compact, One-piece Design
Fits in crowded motor starters, power supplies and control
panels.
- Input Isolation
Much safer than shunt/relay combinations.
- Output Installation
Isolated output greatly simplifies wiring.
- Tough
Designed to handle harsh industrial environments.
- Adaptive Hysteresis
— Hysteresis is 5% of setpoint.
— Allows closer control than fixed hysteresis.
- Reliable
Solid state design, or electromechanical relay output.
- Built-in Mounting Bracket
Solid, secure mounting that inspectors want to see.
| Output |
Isolated dry contact |
| Output Rating |
• Solid State: 0.2A @ 240VAC/DC
(N.O. Only)
• Relay: 5.0A @ 240VAC, 5.0A @ 30VDC (SPDT) |
| Off State Leakage |
<10 microamps (solid state) |
| Response Time |
• 100mS (10% above Setpoint)
• 20mS (100% above Setpoint) |
| Setpoint Range |
4–20, 10–50 and 15–100A (DC)
Jumper select (derate by ÷2 for AC) |
| Hysteresis |
5% of Setpoint |
| Overload |
• Unaffected
by sustained monitored current overloads |
| Isolation Voltage |
3kV |
| Frequency Range |
DC to 400Hz |
| Sensing Aperture |
0.75" (19mm) diameter |
| Power Supply |
20–28VDC or
98-105VAC |
| Power Consumption |
3VA |
| Case |
UL 94V-0 Flammability rated |
| Environmental |
• –4 to 122°F (–20 to 50°C), 0–95%
RH, non-condensing
• –40 to 140°F (–40 to 60°C) (Solid State Output
Only) |
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