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 and you can find them on our Induction Page for their use and setup video.

MirW Relay

We have looked at the interface and the MirW Concept now let's take a look at the board design itself.  These controllers allow you to trigger a relay simply by using a contact closure (no voltage).  All relays are electronically latched, depending on the contact closure input that you are using you can momentarily keep the relay on or use an Alternate Action Switch can trigger relay on then off.  The relay on the receiver boards can also be used as a contact closure input in applications that require a contact closure trigger point.  Fully tested before they leave the production facility each MirW pair 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

MirW Receiver Break-A-Way TabsThe MirW Sender Boards have a great feature where space is a premium - Break-A-Way Tabs.  The Break-A-Way Tabs allow most receiver boards to fit in an optional undrilled plastic enclosure.  Snap off the Break-A-Way Tabs and you have a receiver board with a smaller profile when you need to fit in a tight space.

RoHS Option

Compliance to ROHS StandardsOrder your MirW led free and be RoHS Compliant.  If your requirements are for RoHS compliant parts this board is manufactured with RoHS compliant led free parts and solder.

5-Year Warranty/Money Back Guarantee

MirW controllers are guaranteed against manufacturing and functionality defects for a full 5 years!  Not to mention a 30-day money back guarantee!  If for any reason you are not happy with a relay purchased from National Control Devices, 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 of Relay Cycles

MirW 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 5-year 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 manufacturing facility 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 5 to 7 days production time for your order to ship.

Multi-Point Contact Closure Is Here!

A more streamlined manufacturing process brings a more durable, reliable and better relay board to the market. Here's a lists of great features:

Attention: No Voltage Input

Please Note: Users must NEVER apply any voltage to an input on the Mir-C controller, these inputs are for Contact Closure connections only.

Attention: Relays Provide No Voltage Output

Please Note: 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 controller you choose.
For wiring information see our Relay Logic page.