AC Current Sensing Switch 0-200A Normally Closed Current Sensor Monitoring Relay (NC200)
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AC Current Sensing Switch 0-200A Normally Closed Current Sensor Monitoring Relay (NC200)

4.0/5
Product ID: 502305902
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Details

  • Connector Type
    Surface Mount
  • Contact Material
    Plastic
  • Contact Type
    Normally
  • Current Rating
    5E+1 Amps
  • Mounting Type
    Surface Mount
0.5-200A sensing range
🔒Normally Closed for fail-safe operation
⏱️≤200ms ultra-fast response

Description

⚡ Stay ahead of power surges with lightning-fast, precision sensing!

  • INSTANTANEOUS RESPONSE - Closes contacts within 200ms to ensure real-time protection and control—because every millisecond counts.
  • UNIVERSAL COMPATIBILITY - Solid-state outputs and self-powered design make integration seamless across diverse AC systems.
  • PRECISION CURRENT SENSING - Accurately monitors 0.5 to 200 amps with 1% precision—never miss a beat in your power flow.
  • BUILT IN SECURITY ISOLATION - Mutual inductance design isolates input/output for enhanced safety and reliability in critical environments.
  • INTUITIVE LED STATUS INDICATOR - Visual feedback at a glance—know your switch’s status instantly without guesswork.

The NC200 AC Current Sensing Switch offers a robust 0.5-200A detection range with 1% accuracy, delivering ultra-fast ≤200ms response times. Featuring normally closed contacts for fail-safe operation, it integrates easily with universal solid-state outputs and includes built-in security isolation. Its intuitive LED indicator ensures real-time status monitoring, making it ideal for AC motor overload protection and automated control systems.

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Have a Question? See What Others Asked

My normally closed sensor doesn’t appear to have power when there’s no current so relay doesn’t stay closed. Am I missing something?
ordered 2 of the "NC" units niether one has continuity between the contacts when no currant is flowing. Did i get bad ones or is this somehow normal?>

Reviews

4.0

All from verified purchases

D**E

Works perfectly

Works perfectly. I put this in a double gang deep electrical box in our kitchen with a switch that disconnects the power to our crawl space sump pump. This detects current flow and turns on an indicator LED so I know when the pump is actually RUNNING (when the float switch detects water). A few years ago our old sump pump switch got stuck. That pump ran continuously for days. We found out when a smoke detector detected heavy smoke coming from the old pump - it almost burned our house down! This gives a lot of peace of mind since now I know when the pump is actually running.

B**Y

Works well, helped me diagnose a problem.

Combined it with a 120V pilot lamp to see when my well pump is running and figured out a problem. It'll pay for itself in 2 weeks..

B**L

VS POOLPUMP SALT WATER CLORANATOR UPGRADE (SWCG)

Upgrading a fixed speed poolpump and SWCG to a VS pump requires a means of removing power from the SWCG when the pump internal timer turns the pump off. Using the normally OPEN version to drive a power contactor/relay, controls power to the SWCG. In my application, L1 of the motor supply is passed through the sensor (red #12 wire in photo) to detect when the pump is off, which opens sensor output and relay, removing power from SWCG. The adjustment allows setting trip current for any pump speed. So far this has worked PERFECTLY.

C**N

Useless product. Contacts open at all times regardless of current.

I tried both the 30A and 50A normally-closed relays (NC30 & NC50), and both had relay contacts that never changed state. They just stayed open whether the current threshold had been met or not. Even when disconnected, even straight out of the box, the contact were open on the normally-closed relays. The LED lights would come on when current passed through, but the relay didn't change. So if you want a pretty light that comes on, hey great, but if you need relay action look at some other product.

D**H

Web info is wrong.

This is a initial review, and more will come. There is a problem in this products web listing. I opened my package and used a VOM to be sure that it was a Normally Open relay contact. The website says it is a Normally Closed relay device.

R**O

Microwave Auxiliary In Line Fan Controller

Created a junction box with this current sensor to turn on an inline 6 inch fan whenever the microwave was powered on.

H**.

Amazing product

I’ll buy it again , it works from the very beginning. Description sucks but for smart people it will work

J**G

Works well

The media could not be loaded. Worked well for my needs, to turn one appliance off when another turned on. Be careful with the amperage, can only handle .3 amps on the terminals, needs to be used in conjunction with a contactor.

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Ac Current Sensing Switch 0 200a Normally Closed Current Sensor | Desertcart JORDAN