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LRR25_XSC Reactor Relay

2-Channel 5-Amp Relay with XSC Interface
Sensor Activated Relay Control w/8 Inputs

LRR25_XSC Reactor Relay
LRR25_XSC Reactor Relay Controller
The LRR25_XSC triggers relays automatically based on inputs.  Connect sensors and setup relay activation functions using Base Station Software.  Once configured, Reactor Controllers work with or without a computer!

Reactor Series at a Glance

  • 8 Analog Inputs Trigger Relays
  • Configure Board with Wireless Connection
  • Configuration options
      - 256 Different Trigger Points
      - 8 Background Timers Available
      - 4 Rotation Counters Available
      - Configure Activation Sequences
  • Base Station Software
      - Point & Click Interface
      - Use to Configure Board
      - Read Sensor Levels
      - Read Status of Relays
      - Manually Trigger Relays
  • Operates With or Without a Computer
  • Use a Computer to Take Control of the Reactor or to Return Control to Stand-Alone Operation Wirelessly!
Sensor Controlled Relay
Reactor Relay with Wireless Interface

The LRR25_XSC is equipped with firmware built into the board that will allow attached sensors to trigger relays at a predetermined setting.   The LRR25_XSC Reactor Relay can allow you to switch when a sensor leval is reached or contact closure triggered.

LRR25_XSC The Ideal Choice
The LRR25_XSC Reactor Relay uses an XSC Long Range wireless interface that connects to a modem on your computer to configure the board.  Wireless access to the board when it may be located out of reach!  Making this the ideal choice for wirelessly accessing and controlling relays using a sensor or contact closure!

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Variable Input Sensor Controlled Relay
The LRR25_XSC includes a wireless interface
for easy configuration and controlling the relays.
Extremely Powerful, Very Reliable Sensor Relay!


Here's Where to Order:

Ratings AC DC
Voltage 240 24
2-Channel 5-Amp Relay with XSC Interface
Sensor Activated Relay Control w/8 Inputs
Part#: LRR25_XSC $211.00

Power Supply Available

PWR12 Power Supply
The PWR12 is regulated power supply providing clean power necessary for the performance of these boards
Power Supplies $24/ea

Modem Required

Short Range Modem
The short range UXSCMSR_ZIGMO modem has a range of 2 miles line of site!

at checkout
Stock#: UXSCMSR_ZIGMO $120

Enclosure Available

SFL Enclosures
The SFL Enclosure is an undrilled, non-waterproof enclosure and is available at checkout for this controller.
Stock#: ENC-SFL $17/ea

Induction Supression

Induction Capacitors
Add years to the lifespan of the relay by adding an Induction Capacitor to the line when switching inductive loads. 
Induction Suppression $1.99 - $4.89 ea
Available at Checkout
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Sensor Controlled Relay

Configure Trigger Points Wirelessly
Once Configured the Computer is No Longer Needed!
Board Triggers Relay Based on Configured Sensor Points

Wireless Configuration

The Reactor controller must be configured using a computer and the included Base Station Software.  Once configured, a Reactor will operate without a computer.  By choosing the XSC Long Range Wireless version you will communicate to the board wirelessly through a modem connected to the USB port of your computer.  The wireless option is perfect for applications where the board may be mounted where it's difficult to reach.  Wireless will allow you to access the board to make configuration changes or to take manual control of the board.

Take Manual Control of Reactor

At any time, a computer may monitor the Reactor, trigger events, activate relays, or change configuration settings.  This wireless version will allow easy access to the board even if it's installed in an out of the way location.  A computer can take over a Reactor or a Reactor can operate autonomously (without a computer).  The Reactor Configuration Utility (part of Base Station) provides over 100 pre-set configurations that will help you understand the capabilities of the Reactor and provide you a starting point for your own application.

2-Mile Wireless Relay

XSC is not one of the most widely known wireless technologies but it is easy to setup and capable of transmitting up to 2-miles very reliably.  An XSC modem plugs into your USB port of your computer (available at checkout) and will transmit to the XSC relay with a standard range of 2-mile and up to 15 miles.  We have tested the 2-mile range and it's very reliable, anything over this will require a rooftop antenna to extend the range to 15 miles (untested).  You can choose module installed in the modem and board at checkout.

XSC Wireless Modules

XSC Long Range wireless ModuleThis board is equipped with an XSC Module.  The XSC communications module adds long range wireless communications to the board.  The module is powered from the board.  The board itself will require 12 volts of power and can be hard wired or you can purchase a "wall wart" type transformer at checkout.

Line-Of-Site Operation

As with any wireless technologies, for optimal performance it needs to be line-of-sight.  In other words the antennas of the board and modem must "see" each other to get the optimal range or even be able to communicate at all.  Mounting slots on the modem make it easy to attach to a wall to allow for line-of-site operation.

Standard Range Antenna

The XSC900SR Standard Range Antenna (distance of 2 miles) is included with the price of the controller.  The antenna has a short pig tail that connects to a button on the XSC module.

XSC Long Range AntennaLong Range Antenna

An outside antenna will need to be installed in order to reach the 15 mile limit of these devices.  When you choose this optional antenna we will include everything you will need to install this except for the pole.  Included will be the Cushcraft PC9013 antenna, 20 feet of cable (longer cables are not recommended) and the connector to connect the board to the cable.  Purchase a pole to mount the antenna from your local home improvement store and install the antenna.  Connect the board to the antenna via the provided cable and start sending commands.

XSC Wireless Modem

802.15.4 ModemPlug the UXSCMSR_ZIGMO standard range modem (2-miles) or UXSCMLR_ZIGMO long range modem into the USB Port of your computer.  The modem will mount as a COM port on your PC.  Open the COM port and start sending data to the modem.  The modem will forward your data to all Wireless XSC compliant devices within range (it is also possible to speak to a specific device when other controllers are in range).  Look for the modem option at checkout.

Once Configured

Once a Reactor is configured, the Reactor monitors inputs. When inputs reach user-defined limits, relays can turn on or off.  Reactors allow much more than simple relay control.  Reactor inputs can trigger timers and rotations.  A timer allows a relay to activate over a duration of time.  A rotation is a simple counter, in which relays can be assigned to each "count".  This allows powerful functions such as relay activation sequencing, flashing, and stepping.  Event Piping allows timers and rotations to trigger other timers and rotations.  This is very powerful for setting up complex relay activation sequences.

8 Inputs Available

Reactor Inputs play a vital role in the use of a Reactor controller.  Analog inputs are simply inputs that are sensitive to voltages.  Analog Inputs are capable of reading switches and sensors operating in the 0 to 5VDC range.  Once configured, the Reactor CPU is constantly monitoring external sensors using 8 analog inputs that can read switches, resistance changes, or voltages from 0 to 5VDC.  Inputs can be configured to trigger relays, relay timers and relay activation sequences.

Input Voltage Changes

Analog Inputs are very special in that they are sensitive to voltage changes.  In the case of a Reactor controller, analog inputs have an 8-bit resolution, meaning the voltage input (from 0 to 5VDC) is interpreted as a value from 0 to 255.

    For Example
  • A voltage input of 0 Volts is interpreted as a value of 0
  • A voltage input of 2.5 Volts is interpreted as a value of 128
  • A voltage input of 5 Volts is interpreted as a value of 255

So if you divide 5 Volts by 256 possible steps (0-255 for 8-Bit resolution), the Reactor controller is sensitive to voltage changes as small as 0.0195 Volts.  A Reactor controller has 8 inputs.  Each input is capable of reading a separate voltage from 0 to 5 VDC, provided all voltages can share a common ground.

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 Base Station Software.  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 patience.

Induction Capacitors

Induction CapacitorPerhaps the most overlooked aspect of relay control is proper handling of inductive loads. Inductive loads can best be defined as anything with a magnetic coil, such as a motor, solenoid, or a transformer.  Controlling a inductive load using this relay controller requires the use of induction suppression capacitors.  The purpose of this capacitor is to absorb the high voltages generated by inductive loads, blocking them from the contacts of the relay.  Without this capacitor, the lifespan of the relay will be greatly reduced.  Induction can be so severe that it electrically interferes with the microprocessor logic of our controllers, causing relay banks to shut themselves down unexpectedly.  In the case of USB devices, customers may experience loss of communications until the device is reconnected to the USB port.  Capacitors that we offer are available at checkout, for more information view our Induction Suppression Video.

SPDT Relay Controller

SPDT RelayThis device has SPDT relays installed.  SPDT Single Pole Double Throw Relays have three connections - Common, Normally Open, and Normally Closed.  When the relay is off, the common is connected to the normally closed connection of the relay.  When the relay coil is energized, the Common swings over to the Normally Open Connection of the Relay.  You can wire the device you are switching to either the Normally Open or the Normally Closed position.  For more information on selecting the correct relay amperage for your application see Choosing a Proper Amperage.

Base Station Software

Base StationBase Station will assist you in learning how this device functions and is the ultimate reference tool for configuring, testing and controlling this device.  Base Station software supports every feature of this device - no other controller manufacturer even comes close to offering this type of software.  Base Station works by communicating with your controller to identify the model and provides the appropriate graphical user interface for setting up and testing the identified device.  All Reactor configurations will be made through Base Station and an overview will be discussed below.  To help you get started and learn this controller Quick Start Guides are available for just about every feature.  As you discover a feature in Base Station a link is provided where you can easily download the Quick Start Guide.

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.

Using Input Values

Input Value
Reading from Left to right, the settings above indicate Input 1 will trigger a relay when Analog Input 1 is above 200.  We have defined that a relay will turn on when the input level is defined by a value of 200.

Input Value
In the above example, a relay is triggered when an analog input is inside a set range between 100 and 202.  By defining two limits, you can further narrow the parameters for the activation of a relay.  The limits can also be assigned to set the relay to be activated outside two set limits.

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.

Many More Options

We have just touched on the many ways the Reactor board can be configured.  The applications that this board can be use in are extensive.  For a more detailed look at the configuration and setup you can look at the Reactor Series Quick Start Guide.

Reactor Relay

We've looked at the interface and the configuration now let's take a look at the board design itself.  The Reactor series controllers are machine manufactured for a highly accurate and reliable design.  Fully tested before they leave the production facility each Reactor controller is ready to stand up to rigorous demands from heat, cold or vibration.  The best test of all is the numerous boards in the field from customers all over the world in all sorts of conditions.  Take it from us, these controllers will hold up!

Break-A-Way Tabs for a Smaller Design

The ProXR Lite relays have a great feature where space is a premium - Break-A-Way Tabs. The Break-A-Way Tabs allow most boards to fit in an optional undrilled plastic enclosure.  Snap off the Break-A-Way Tabs and you have a controller with a smaller profile when you need to fit in a tight space.

Not Expandable

The Reactor Series controllers are not expandable.

Compliance to ROHS StandardsRoHS Option

Order your board lead free and be RoHS Compliant.  If your requirements are for RoHS compliant parts this board can be ordered to be manufactured with RoHS compliant lead free parts and solder.  Just look for the RoHS option at checkout.

30-Day Warranty/Money Back Guarantee

ProXR Lite series controllers are guaranteed against manufacturing and functionality defects for a full 30 days!  Not to mention a 30-day money back guarantee!  If for any reason you are not happy with a relay purchased from Relay Pros, simply return it within 30 days and we will give you your money back!  Controllers that are damaged by our customers will not of course be warranted under any circumstances. 

Thousands or Relay Cycles

ProXR Lite series controllers are designed for long life, you should expect to get years of service from your controller and literally thousands of cycles from the relay(s) onboard.  With a 30-day warranty and a money back guarantee you have nothing to loose!  Place your order now, while everything is in front of you.


The boards sold are brand new units shipped from our office conveniently located in Missouri.  These boards are completely tested before they are released for shipping  With so many boards on our site it is impossible to stock boards, please allow two to three days production time for your order to ship.  If you have any questions please feel free to call our office at 800-960-4287 or e-mail us at

Sensor Control Is Here!

Trigger relays with a sensor with and configure with included Base Station software.  Here's a lists of great features:

    User Friendly Software
  • Point & Click Interface - No Programming Knowledge Required
  • Override Sensor When Computer is Connected to Board
  • Read Sensor Levels in Base Station
  • Read Status of Relays in Base Station

    User Friendly Board Design
  • 8 Analog Sensor Inputs Available (0 to 5 Volt Only)
  • Break-A-Way Tabs lets you decide the board's size
  • Screw terminal or direct relay connections make connecting to the relays easy

  • 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.


Part 1: An Overview of Reactor Series Relay Controllers.


Part 2: All about Reactor Series Controller Inputs.


Part 3: All about Reactor Series Controller Events.


Part 4: All about Reactor Series Controller Outputs.


Part 5: Learn how to use the NCD Configuration Utility to Setup your Reactor Controller.


This video will show you what Induction is and how to use Capacitors to Suppress it.
Also read our Article on Induction Suppression.


Test of the range of our Wireless Communication Options


Test of the range of our IEE 802.15.4 Wireless Communication Options


Test of the range of our Wireless Key Fob Communication Options


Test of the range of our XSC Wireless Communication Options