Current Sensing Switches (Current Sensing Relays) | NK Technologies

High Performance Current Sensing for Automation Applications

1-800-959-4014 | sales@nktechnologies.com

Our Wide Range of AC or DC Current Sensing Switches Guarantees You’ll Find Exactly What You Need.

To assist in guiding you to the right series for your application please begin your selection here!

NEW! Technical Guide to Motor & Pump Monitoring

DC CURRENT SENSING SWITCH SELECTION

DC Loads, Go-No-Go

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
DS1 SERIES	Trips at 0.75, max. 1000 A for 5 secs. or 500 ADC Continuous	Solid-State Contact	10–28 VDC	0.55″ dia.

AC & DC LOADS, ADJUSTABLE TRIP-POINT

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
DS1-FD SERIES	20–400 ADC, 17–338 AAC	SPDT Relay, Auto-Reset or Latching	24 VAC/DC	1.31" dia.
DS3 SERIES	2–20 A, 10–50 A and 20–100 A, Jumper Selectable	SPDT Relay or Solid-State Contact (depending on model)	24 VAC/DC or 12 VAC/DC (depending on model)	0.75″ dia.

AC CURRENT SENSING SWITCH SELECTION

PLC or DCS Input

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
ASM SERIES	1.5–150 A or 2.8–150 A (depending on model)	Magnetically Isolated Solid-State Relay, 150 mA Max	Self Powered	0.74″ dia., 0.85″ sq. (depending on model)
ASL SERIES	1–10 A, 2–20 A, 10–50 A, 20–50 A, 50–100 A, 100–150 A (depending on model)	Magnetically Isolated Solid-State Relay, 150 mA Max	Self Powered	0.55″ dia., 0.85″ sq. (depending on model)
ASC SERIES	2–150 A, 3–150 A (factory set)	Magnetically Isolated Solid-State Switch	Self Powered	0.74″ dia., 0.85″ sq. (depending on model)
AS3 SERIES	1–6 A, 6–40 A & 40–175 A or 1.75–6 A, 6–40 A & 40–200 A (depending on model)	Isolated Solid-State Relay, 150 mA Max.	Self Powered	0.55″ dia., 0.74″ dia., 0.85″ sq. (depending on model)
AS1 COMPACT SERIES	0.5 A Trip Point	Solid-State Contact, 150 mA Max. AC/DC Load	Self Powered	0.31″ dia.
AS1 SERIES	1–150 A Adjustable; 1.75–150 A Adjustable (depending on model)	Magnetically Isolated Solid-State Switch, 150 mA Max. AC/DC Load	Self Powered	0.55″ dia., 0.74″ dia., 0.85″ sq. (depending on model)

Relay or Contactor Control

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
ASD SERIES	1–50 A or 4–200 A Switch Adjustment (depending on model)	Isolated Solid-State Relay, 1.0 A Max	24 VDC or 24 VAC	0.75″ dia.
AS3 SERIES	1–6 A, 6–40 A & 40–175 A or 1.75–6 A, 6–40 A & 40–200 A (depending on model)	Isolated Solid-State Relay, 1.0 A, 3.0 A or 15 A Max	Self Powered	0.55″ dia., 0.74″ dia., 0.85″ sq. (depending on model)
AS1 NOR-FT-GO SERIES	Go/No-Go Fixed Trip Point	Electromechanical Relay, 5.0 A Max.	Self Powered	0.74″ dia.

Very Low AC Current Detection

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
AS0 SERIES	3–15 mA or 15–350 mA Field Adjustable	Isolated Solid-State Relay	20% +/- of Nominal Voltage of 120 VAC or 24 VAC/DC	0.75″ dia.

Adjustable Delay on Current Rise

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
ASX SERIES	1.5–12 A, 12–55 A, 50–200 A, Jumper Selectable	Isolated Solid-State Relay	Self Powered	0.75″ dia., 0.85″ sq. (depending on model)

Inrush Delay Plus Adjustable Delay on Current Rise

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
ASXP-LS SERIES	200–800 A, 400–1000 A, 600–1200 A, 1000–1600 A (depending on model)	Electromechanical SPDT Relay	24 VAC/DC or 120 VAC (depending on model)	2.3″ x 3.42″
ASXP-MS SERIES	50–200 A, 100–400 A, 150–600 A, 200–800 A (depending on model)	Electromechanical SPDT Relay	24 VAC/DC or 120 VAC (depending on model)	1.19″ x 2.22″
ASXP SERIES	1–20 A, 20–50 A, 50–80 A (depending on model)	Electromechanical SPDT Relay	24 VAC/DC or 120 VAC (depending on model)	0.75″ dia.

Analog Output Plus Limit Alarm Contact

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
ATS SERIES - SWITCH SETPOINT	Switch Selectable 10–1200 A	Electromechanical SPDT Relay, Plus 4 - 20 mA	120 VAC or 24 VDC	1.875" dia.
ATS SERIES - DIGITAL SETPOINT	Switch Adjustment 1–50 A or 4–200 A (depending on model)	Isolated Solid-State Relay, 1.0 A Max Plus 4–20 mA, 0–5 VDC or 0–10 VDC	18–30 VAC/DC	0.75" dia.

Dual Setpoint, Dual SPDT Relay Outputs

MORE INFO	SETPOINT RANGE	OUTPUT SIGNAL	POWER SUPPLY	SENSING APERTURE
ASP-FD SERIES	1-400 A, Six Ranges Available	2-SPDT Relays	24 VAC or DC <2 VA Consumption	1.31" (33.3 mm)

CURRENT SENSING SWITCH SELECTION BY SERIES