Visit one of our
other great web sites:

Visit Ozarks AV for the best in AV Equipment

Visit for the best in Agricultural Switching

We Accept:

KLRR15_XSC Key Fob Relay

Key Fob Relay with XSC Interface
1-Channel 5-Amp SPDT Relay Installed

KLRR15_XSC Key Fob Relay Control
KLRR15_XSC Key Fob Relay Controller
The KLRR15_XSC triggers relays From a Key Fob or automatically based on sensor inputs.

802.15.4 Key Fob at a Glance

  • Key Fob or Sensor Input Triggers Relays
  • Accurate Surface Mount Machine-Manufactured
  • Configure Board with Wireless Connection
      - 2-Mile Range
         (from computer to board NOT key fob)
      - Requires XSC Modem
      - Send Configurations Wirelessly
      - Modem mounts as a virtual COM port
      - Different Connection Than Key Fob
  • Programmable Key Fob
     - Distance 200 to 300 Feet
     - Multiple Buttons for Different Functions
     - Multiple Functions for Each Button
  • Key Fob Options
     - Multiple Key Fobs Per Board
     - Multiple Boards Per Key Fob
  • A/D Input 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
  • Use a Computer to Take Control of the Reactor and Return Control to Stand-Alone Operation
Key Fob Relay
Key Fob Relay with Wireless Interface

The KLRR15_XSC is equipped with firmware built into the board that will allow a Key Fob or attached sensors to trigger relays at a predetermined setting.   The KLRR15_XSC Key Fob Relay can allow you to switch when a sensor leval is reached, contact closure triggered or from a Key Fob you hold in your hand.

KLRR15_XSC The Ideal Choice
The KLRR15_XSC Key Fob 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!  The computer is needed to configure the buttons of the key fob - you determine what the relays will do when the button is pushed.  Momentary or toggle switching as well as delays can be configured into each button.  Multiple buttons can activate one relay in different ways, one key fob can control multiple boards or multiple key fobs can control one board.  Making this the ideal choice for controlling relays using a key fob or sensor!

Long Range Wireless Interface & Key Fob Control
The KLRR15_XSC has a XSC interface that is for uploading the key fob configuration to the board and taking manual computer control of the board.  This should not be confused with the key fob control that is wireless and seperate from XSC control.  This wireless board is used in situations where the board may be located in an out of the way place making configurations changes difficult.

Content on this page requires a newer version of Adobe Flash Player.

Get Adobe Flash player

Key Fob Controlled Relay
The KLRR15_XSC includes an XSC interface
for easy configuration and controlling the relays.
Extremely Powerful, Very Reliable Key Fob Relay!


Here's Where to Order:

Ratings AC DC
Voltage 240 24
Key Fob Relay with XSC Interface
1-Channel 5-Amp SPDT Relay Installed
Part#: KLRR15_XSC $237.00

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

Enclosures Available

TFL Enclosures
The TFL Enclosure is an undrilled, non-waterproof enclosure and is available at checkout for this controller.
Stock#: ENC-TFL $19/ea

Key Fobs Available

Additional Key Fobs

Key Fobs
Use more than one key fob to control this board.
Available Key Fobs
Key Fobs can be purchased individually
or in money saving 5-Packs or 10-Packs
options available at checkout

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

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
Credit Cards Accepted
PayPal Logo

Shipping and Payment Information
Warranty Information
Order Online or Call Us At:
Fax Purchase Orders To

Key Fob Controlled Relay

Configure Trigger Points Wirelessly
Once Configured the Computer is No Longer Needed!
Key Fob Control

Long Range Wireless Configuration

The Key Fob Reactor controller must be configured using a computer and the included Base Station Software.  Once configured, the Key Fob 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.

Take Manual Control of Board

At any time, a computer may monitor the Key Fob 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.

How It works:

The first thing you need to do is plug XSC modem into the USB port of your computer, this will wirelessly send the configuration to the board.  For more information on drivers and assigning a COM port see the XSC Quick Start Guide.  Next, the Reactor controller must be configured using a computer running a Windows Based operating system.  All Key Fob/Relay Control decisions are made based on your configuration settings.  Configuration settings are created and loaded into the Reactor controller using the Base Station Software.  Configuration is a simple Point and Click process, setting parameters to activate relays with user-defined limits, see Reactor Start Guide for more in configuring the board .  Configuration files can be saved onto your computer and into the controller.  This configuration system simply tells the Reactor Key Fob how the buttons should interact with the relays.  Once you are satisfied with the operation of the Key Fob configuration, you can disconnect the board from the computer and it will operate on it's own

Once Configured

Once configured, the Reactor CPU is constantly monitoring your Key Fob button presses using 8 analog inputs.  You can use all 8 analog input channels for to monitor your Key Fob buttons, or you can trade a few buttons and use External sensors which may be used for more complex decision making tasks.  Key Fob Buttons and Sensors 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 using sensors.

Take Manual Control of Reactor

At any time, a computer may monitor the Reactor, trigger events, activate relays, or change configuration settings.  This Ethernet version will allow easy access to the board as long as it's plugged into a router or hub.  A computer can take over a Reactor or a Reactor can operate autonomously (without a computer).

Customizable Key Fob Control

Use a button to activate a Relay, use another button to deactivate a relay.  Use another button to toggle a relay.  Use another button as a momentary switch.  Key Fob Reactor Relay Controllers allow you to configure your Key Fob Buttons to control relays in just about any way you can think of.  Use a single button to control 8 relays using a Rotation.  Use a single button to activate a light for a pre-configured time period.  Step the number of active relays up and down using only 2 buttons, or trigger relays in binary sequences for simple 1-button controlled lighting effects.  Add sensors to your Reactor controller to make intelligent decisions!

Key Fobs

Key Fobs are available in 6 sizes from a 1-button through 8-button models.  The key fobs are paired with the controllers using dip switches located on the board and key fob.  This way you can set multiple key fobs to one board or have one key fob control multiple boards.  The options are endless, plus the key fobs are relatively inexpensive so everyone in the office can have one.  See all the Available Key Fobs.
Configuration Utility Input Key Fobs are available in 6 sizes from
1-button through 8-button models
Available Key Fobs

Key Fob Range

The antenna that is included with the board provides between 200 and 300 feet of reliable operation within Line of Sight using 418 MHz RF frequency.  We paired a Reactor controller with a small integrated "Whip" antenna and tested usable range.  The installation environment was typical.  Not direct line of site, some trees, masonry, and vehicles nearby.  We were able to receive signals from these small Key Fob remotes RELIABLY (working nearly 100% of the time) at 200 feet with 50% reliability at 300 feet.

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 Suppression

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 Ethernet devices, customers may experience loss of communications until the device is reconnected.  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.

1 Sensor Input Available

Reactor Inputs play a vital role in the use of a Reactor controller.  The key fob itself takes up seven inputs, this board also includes an eighth input that can be used for a external sensor.  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 the single analog input 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.  This Key Fob Reactor controller has 1 input for external sensors.  The input is capable of reading a separate voltage from 0 to 5 VDC, provided all voltages can share a common ground.

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 Key Fob 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 eventbased on the voltage readings of the analog inputs or pressing a key fob button.  The buttons on the key fob are assigned an input, the number of inputs will depend on the number of buttons on the key fob you choose, with some left over for external sensors.  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). 

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 and button on the key fob.  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).  Remember, depending on which key fob button you choose will deturmine how many inputs you have available.

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 or key fob button.

Many More Options

We have just touched on the many ways the Key Fob 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 Key Fob 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 Key Fob Reactor boards 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

This board is led free and RoHS Compliant.  If your requirements are for RoHS compliant parts this board is manufactured with RoHS compliant led free parts and solder.

Removable Communication Module

Once configured, the Reactor controller can operate on its own, without a computer. The Reactor will never lose its settings. In fact, the communication module can be removed from the Reactor controller and used to configure another Reactor controller. This helps keep costs down. If you choose to leave the communication module installed on the Reactor, your computer can monitor inputs and relays, even take control of relays, and even use to control the relays from anywhere in the world.

Computer Controlled Relays

Software developers who need remote access to a Reactor controller will find themselves at home. The Reactor supports a very powerful computer-based command set, so it is possible for a computer to operate the relays and read sensor input. The computer can over-ride the Reactor decision logic, trigger events, and return control of the relays back to the Reactor Logic. Configuration settings are stored in files that can be loaded into the Reactor controller.

30-Day Warranty/Money Back Guarantee

Key Fob Reactor 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 NCD, 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. 

Millions of Relay Cycles

Reactor series controllers are designed for long life, you should expect to get years of service from your controller and literally 1 to 2 million 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!


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.

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