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National Control Devices, LLC

Variable Input Sensor or Contact Closure Activate Relays

Variable Input Sensor or Contact Closure Activate Relays

Reactor Relay Series Controllers

Variable Input Sensor or Contact Closure Activate Relays

Sensor Relay Control

All The Features You Need...

  • Works Without a Computer
  • 8 Analog Inputs Trigger Relays Based on User Configuration
  • 8 Available Timers Offer Time Delay Functions
  • Inputs may Directly Trigger Relays
  • Inputs may Directly Trigger Events Such as Timers
  • 4 Rotation Counters Trigger Relays Based on Counting Values
  • Use a Computer to Take Control of the Reactor Logic or to Return Control to Stand-Alone Operation
  • Built-In Temperature Sensor on 4 & 8 Channel Models

Analog Inputs Trigger Relays
Unique Sensor Activated Switching

The Reactor Relay controllers represent the worlds first relay controller capable of making its own intelligent decisions based on user input.  The Reactor Relay Series controllers are configured using our custom Reactor Configuration Utility.  Once configured, the controller works without a computer connected, allowing analog inputs to trigger relays according to the configuration. The Reactor Relay was developed to address the needs of customers who need a controller capable of making intelligent decisions without a computer.  Once configured, the Reactor will work on its own.  At any time, a remote computer may read analog inputs and take control of the relays.  The remote computer can later return control back to the Reactor logic.

Configuration Software Included!

Reactor controllers trigger relays automatically based on inputs.  Connect sensors and setup relay activation functions using our NCD Configuration Utility Software.  Once configured, Reactor Controllers work with or without a computer!

Other Sensor Relay
Contact Closure Options:

MirC Relay Pair

Contact Closure Relay

Time Delay Relay

Category Link: MirC Relay
  • Sender Controls Receiver Device
      - Contact Closure Inputs on Sender
      - Relay Outputs on Receiver
  • Wired, Wireless & Internet Operation
  • No Programming Required

MirX Relay Pair

Contact Closure Relay

Mir-X Contact Closure Relay

Category Link: MirX Relay
  • Each Device Controls the Other Device
      - Local Inputs Control Remote Relays
      - Remote Inputs Control Local Relays
  • Wired, Wireless & Internet Operation
  • No Programming Required

ProXR Lite Relays

User-Programmable Controller

ProXR Lite User-Programmable Contact Closure Relay

Category Link: ProXR Lite
  • 8 Inputs on Controller
  • Contact Closure Inputs
  • Variable Input Detection
  • Built-In Temperature Sensor
  • Write Your Own Program to Send Commands to Board

N-Button Lite Software

Desktop Contact Closure

N-Button Desktop Contact Closure Reader

Category Link: N-Button Lite Software
  • Read Status of Contact Closure Inputs
  • Meters Measure Variable Input
  • Trigger Rlays with Desktop Button
  • Trigger Multiple Relays per Button
  • Compatible with ProXR Boards

Variable Input Sensor Control

Sensors/Contact Closures Trigger Relays According to Configuration
Time Delay, Rotations & Complex Events can be Configured
No Programming Necessary - Configuration Software Included

Operates Without a Computer

Intelligent Switching without a Computer is the foundation of the Reactor Series relay controllers. The Reactor Series will help you activate a switch when it gets dark outside. If the door has been left open, it will close automatically. When the temperature falls, another switch is triggered. If motion is detected, a light will turn on for a preset time. When soil in the ground is too dry, a switch will be activated that can save your crops, save your energy, save you a trip to the field, and save you money.

Up to 8 timers and 4 rotations can be configured to control up to 8 relays based on 8 separate analog inputs. Programmable Trigger Points can Trigger Timers and Rotation Counters when Analog inputs reach preconfigured levels.

Your Settings can be Saved

Users may load and save reactor settings into individual files.  If you require individual settings for different events, seasons or applications each configuration can be saved to your computer and uploaded when needed.  Your configurations will always be backed up as well.  This saves you time loading configurations to the board.

Configure to Your Needs

The Reactor controller must be configured using a computer and the included software. All decisions are made based on your configuration settings. Configuration settings are created and loaded into the Reactor controller using the NCD Configuration Utility. The Reactor is usually configured using a USB communications module, but may be configured wirelessly. Configuration is a simple Point and Click process, setting parameters to activate relays with user-defined limits.

Once configured, the Reactor CPU is constantly monitoring external sensors using 8 analog inputs. Inputs can be configured to trigger relays, relay timers and relay activation sequences. Complex events can also be configured without any programming. Use the Reactor as a Thermostat, a Motion Activated Light with a Programmable Timer, an Automatic Garage Door Closer, and much more.

The Configuration utility is available as a free download.

Who's Qualified to Use the Reactor Series?

Some computer skills required. The Reactor Relays do not require programming, simply configure the device with the included Configuration Utility.  While programming is not required and simple functions can be done rather easily with basic computer skills, complex events can be configured which will require some understanding and patients.

Easy Board Selection

Find the board you need by using the interactive menu to he right.  Hover over the Button and select the communication protocol and then the number of inputs/relays you would like installed.

Configure Each Input

The Reactor Relay allows users to define the activation of a relay or an event based on the voltage readings of the analog inputs.  An input can trigger a relay directly or an input can trigger an event, such as a timer. If an input triggers a relay, the relay may turn on. If an input triggers a timer event, a timer may be started, but a relay may or may not be turned on based on how you have configured the controller (the time delay may be before the relay triggers).  Triggering an event does not mean you are triggering a relay, it just means you are triggering an internal function. Relays may be associated with this internal function to achieve a large number of possible operations.

Configuration Utility Input Input configuration tab of the included software - view entire screen shot.

Output Configuration

Reactor controllers have up to 8 relays available depending on the actual model selected. Each relay can be assigned to a different input or event.  In the example shown below, Relay 1 is Controlled by Input 1 directly.  Input 1 will turn Relay 1 ON. In order for Relay 1 to activate, it must meet the conditions of the Input 1 configuration using the settings on the Input Configuration tab (see above).

There are many ways to directly control a relay from an input. Relays 1-5 in the below example shows how inputs can turn relays on, off, toggle relay state, set the relay to match the state of the input, or set the relay to NOT equal the state of a input.

In the example below, Relay 6 is controlled by Timer 1. In other words, if Timer 1 is active, the relay will stay ON. Otherwise, the relay will turn off. This is a great way to activate a light for a given period of time. If you are interested in Time Delay Relay, timers will be discussed on our Time Delay Relay Page.

Relay Output Configuration The configuration software makes it easy to configure each relay.  Relays or multiple relays can be can be assigned to each input.

Relay Outputs

Reactor Outputs Reactor 4-Output Screw Terminal with Normally Open, Normally Closed and Common are available for each relay. 20 and 30 amp boards will connect directly to the relays. The 30 amp is a SPST relay and only has Common and normally open.  For more click here
Reactor Controllers have 1, 2, 4, or 8 Relays integrated into the circuit board. A relay is similar to a switch. The only difference between a switch and a relay is the actual mechanism for changing the on/off status of the switch. On a switch, you manually push on a piece of metal or plastic to operate the switch. On a relay, an electric current is used to operate the switch. Relays do NOT provide a voltage output. They provide a contact closure output, exactly like the terminals found on a light switch at your local hardware store. Wiring to a relay will be slightly different depending on the model of Reactor controllers you choose.

Attention: 0 to 5 Volt Input Only

Please Note: Analog inputs can accept voltages from 0 to 5VDC ONLY.  Higher voltages and negative voltages will damage the Reactor controller.  Users must NEVER apply a voltage to an analog input on the Reactor controller when powered down.


    Shop Reactor Relays Here

    Activate Relays when Sensors Reach Limits. Trigger Timers, Counters, and Events.
    Use a Computer to Setup the Reactor, then Let the Reactor Work by itself without a computer.
    Manually Take Control of Relays from Anywhere in the World using a Computer as needed.