Contact Closure to Multi-Point Relay 2-Channel 10-Amp
MIRMR210
~~MirM Operations Have Changed~~
Please Note: There two 2 dry contact inputs on the MIRMR210 sender board and 2 relays on each of the receiver boards. Input 1 will control Relay 1 on all the receiver boards, Input 2 will control Relay 2 on all the receiver boards.Contact Closure to Multi-Point Relay
The MirMR210 Contact Closure to Multi-Point Relay allows you to control relays in multiple locations from a contact closure (no voltage) input. Inputs on the sender board control relays on multiple remote boards. There is 2 dry contact inputs on the sender board and 2 relays on each of the remote locations. When the contact closure circuit is closed on the input board all the corresponding relays on the remote boards will energize.
Contact Closure to Multi-Point Relay 2-Channel 10-Amp
MIRMR210MirMR210 At a Glance
- 2 10-Amp Relays Installed
- Single Pole Double Throw (SPDT) Relay
- Temperature Rating -40° C to 85° C - Sold in Groups
- 2 Contact Closure Inputs on Sender Board
- 2 Relays on Each Receiver Board
- 2 Minimum Remote Locations
- Contact Closure (No Voltage) Input
- 2 Inputs on Senter Board
- Input 1 Controls Relay 1 on all Boards
- Input 2 Controls Relay 2 on all Boards - Wireless Operation up to 2 Miles (3.2 kilometers)
- Line-of-Sight Operation - No Computer, No Programming, No Set-Up
- Works Together Right Out of the Box!
Wireless Range
MirM boards operate reliably and efficiently when the antennas can “see“ each other. Obstructions like walls, buildings and even trees and hills can diminish the signal or prevent communication altogether. Metal being the worst for any wireless signal to penetrate with stone and brick and being a close second. Positioning the antennas for line-of-site operation will greatly increase reliability.
Wireless Relay to Multiple Locations
The MIRMR210 has contact closure (no voltage) inputs(s) on the sender boards that will control relays on the receiver boards. When the contact closure circuit on the sender board is closed the relays on the remote boards will be energized. The relays will remain energized until the contact closure circuit opens. When the circuit opens the relay will turn off.XBee-PRO 900 RF Module

Line-Of-Site Operation

Extension Cable

Multiple MirM Sets
Multiple sets of the MirM boardss can be used within range of each other. The boards are married together using the serial numbers of the wireless modules installed, meaning multiple pairs will not interfere with each other! Please note: When there are large numbers of devices using the same channels, there will be interference that can cause dropped communications. There are ways to combat this interference, there are a few things that can be done. Contact us if you are quoting a large job for more information.Attention: No Voltage Input
Please Note: Users must NEVER apply any voltage to an input on the MirM Sender Board, these inputs are for
Dry Contact Connections ONLY.
MirM Relay
MirM controllers are a point to Multi-point set of boards that allow you to control relays by using a contact closure (no voltage). Inputs on the sender board controls relays on multiple remote boards. The relays will remain energized as long as the contact closure input is closed, when the input opens the relay will turn off. Depending on the contact closure input that you are using you can momentarily keep the relay on or use an toggle switch can trigger relay on then off. The relays provide no voltage and can be used as a dry contact output if needed.
Sender Boards
The MirM sender board is basically a contact closure (no voltage) input board. The board will have as many inputs as there are relays on the receiver board. The inputs will control the relays on the receiver boards. Input 1 will control all relay 1's on the receiver boards. Input will control all the relay 2's and so on.No Voltage Inputs
Contact closure inputs such as buttons, switches or other electronic devices (no voltage) attached to inputs on the sender board will trigger relays on the remote locations. The Sender has inputs while the Receivers have relays. When an input on the Sender is tripped by a contact closure a relay on a Receiver board is energized and will remain energized until the contact closure is released.Receiver Boards

2-Million Cycles
MirW series controllers are designed for long life, you should expect to get years of service from your controller and literally 2-million cycles from the relays on board. With a 5-year warranty and a money back guarantee you have nothing to loose! Place your order now, while everything is in front of you.SPDT Relay Installed

Break-A-Way Tabs for a Smaller Design

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 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.This Board is RoHS Compliant

Shipping
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.Who’s Qualified to Use the MirM Series?
Anyone! The MirM Series Controllers are very consumer-friendly devices that are married together through software and only require some wiring by the end user. Whether an electronics engineer or a home hobbyist, almost anyone is qualified to use the MirM Series controllers.Induction Capacitors

Induction Video
Building a Power Budget
The operating range of the board is between 9 & 14 VDC, any power outside this range and the board can become unreliable. Use the tables below to build a power budget for the board you have based on the module you have and the anticipated time the relay will be active.
Power & More
SPDT Relay Controller Specifications
This table covers all NCD SPDT Relay Controllers. All ratings assume 12VDC operation at 70°F (21°C). Please note that most ratings are estimated and may be subject to periodic revision. Some ratings represent stock controller settings without performance enhancement optimizations. The estimated processing time can be impacted by background services and choice of commands. Standby power consumption assume no communications module is installed and no relays are active on the controller. Please add the power consumption of the activated relays and communications module to obtain a better estimation of power consumption.Specs of NCD SPDT Relay Boards | Minimum | Nominal | Maximum | Notes |
Operational Voltages | 10VDC | 12VDC | 15VDC | |
Standby Power Consumption | 35mA | 100mA | 200mA | No Active Relays, No Com Module |
Relay Power Consumption | 28mA | 35mA | 60mA | Consumption of Each Activated Relay |
Operational Temperature Range | -40°F (-40°C) | 70°F (21°C) | 185°F (85°C) | Theoretical Component Limits Shown |
Storage Temperature Range | -67°F (-55°C) | 70°F (21°C) | 185°F (85°C) |
Theoretical Component Limits Shown |
Operational Ambient Air Humidity | 0% | 50% | 70% | Non-Condensing Humidity Values Shown |
Relay Activation Time | 4ms | 5ms | 10ms | Needs Further Validation |
Relay Deactivation Time | 5mS | 10mS | 15mS | Needs Further Validation |
SPDT Relay Installed

2-Million Cycles
ProXR series controllers are designed for long life, you should expect to get years of service from your controller and literally 2-million cycles from the relays on board. With a 5-year warranty and a money back guarantee you have nothing to loose! Place your order now, while everything is in front of you.Communication Module Specifications
This table covers all NCD Communication Modules. While NCD communication modules operate at 3.3VDC, the ratings below highlight the effect they will have on the master controller operating at 12VDC at 70°F (21°C). Maximum ratings should be used for power budget planning purposes and may reflect short term absolute maximum peak current consumption. Some ratings are estimated and subject to periodic revision.Specs of NCD Communication Modules | Minimum | Nominal | Maximum | Notes |
Operational Temperature Range | -40°F (-40°C) | 70°F (21°C) | 185°F (85°C) | Theoretical Component Limits Shown |
Storage Temperature Range | -67°F (-55°C) | 70°F (21°C) | 185°F (85°C) | Theoretical Component Limits Shown |
Operational Ambient Air Humidity | 0% | 50% | 70% | Non-Condensing Humidity Values Shown |
USB Module Power Consumption | N/A | N/A | N/A |
USB Modules are Powered by the USB Port Do Not Consume Device Current |
RS-232 Module Power Consumption | 10mA | 20mA |
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Ethernet Module Power Consumption | 58mA | 82mA | 100mA | |
WiFi Bluetooth USB Module Power Consumption | 37mA | 50mA | 100mA | Up to 300 Foot Indoor Wireless Range, Unobstructed. Up to 50 Foot Range Through Walls |
900MHz Wireless Module Power Consumption | 13mA | 30mA | 50mA | Up to 1,000 Foot Indoor Wireless Range, up to 2 Mile Outdoor Wireless Range using Included Antennas. Up to 28 Miles Outdoor Wireless Range using High-Gain Antennas. |
KFX Wireless Key Fob | 11mA | 15mA | 25mA | Up to 200 Feet Outdoor Wireless Range using 1, 2, 3, 4, or 5 Button Key Fobs. Up to 700 Feet Outdoor Wireless Range using 8-Button Remotes |
AD8 Analog Input Usage Notice
Analog Inputs should not have a voltage present when powered down. Use a 220 Ohm current limiting resistor on each input to prevent damage to the controller if voltage will be present on the analog input when this controller is powered down. Do not exceed 0 to 5VDC on any analog input or the on-board CPU will be damaged. Most analog inputs include a 10K Pull Up/Down resistor to help keep the inputs quiet when not in use. This 10K resistor may slightly bias the readings of some sensors.Power Supply Available

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Enclosure Available

SFL Spec Sheet
CAD Drawing: SFL CAD Drawing
3D Model: SFL_3D
Induction Suppression

What Is Relay Logic?
Relay logic consists of relays wired together in a particular configuration to perform the desired switching operations. Relay Logic is all about wiring up Relays for Logical Switching applications. Get a printout of this page
Relay Logic
Relay Logic Samples
This page demonstrates several simple ways to wire a relay or multiple relays for various applications. We use the example of switching a light but the light can be swapped for a gate control, security system, dry contact output and other devices. These examples show different ways to wire to a relay or multiple relays to produce a desired effect.Get a printout of this page
SPDT Wiring


SPST Wiring
SPST Single Pole Single Throw Relays have two connections - Common and Normally Open. The Common (COM) is the moving part of the relay that comes in contact with the Normally Open (NO) when the coil to the relay is energized. The only SPST relay we sell on this site is the 30-Amp relays, The wiring examples below can be used with the 30-Amp relays as long as the example doesn't use the Normally Closed position.DPDT Wiring


Relay Logic Examples

Example 1 - Simple Off/On
This example demonstrates how a relay can be used to activate a light bulb. When the relay turns on, the light comes on. Only one power wire is switched with this example using the COM (common) and NO (normally open) connections of a relay. This is the simplest of the examples, switching a light in this example or any device on when the relay is energized.
Example 2 - Simple On/Off
This example demonstrates how a relay can be used to turn a light bulb OFF. When the relay is energized the light turns off, when the relay is off the light will be ON. Only one power wire is switched in this sample using the COM (common) and NC (normally closed) connections of a relay. Not commonly used but great for applications where the device is on most of the time so the relay doesn't have to be energized to to keep the device on. Power cycling a device can be a typical use for this wiring, when the relay turns on the device is powered off.Example 3 - 2 Relays to Activate

MirC/MirX Users: Two contact closure inputs in the sender board required to control a device. Use this wiring when you require two outputs to close before you switch the relay.
Example 4 - 3 Relays to Activate

Example 5 - Override Function

MirC/MirX Users: Add a manual button or switch to control the third relay to manually control the light if you have sensors that control the other relays.
Reactor Users: Add a manual button or switch to control the third relay to manually control the light if you have sensors that control the other relays.
Example 6 - Either Relay Activates

MirC/MirX Users: Two contact closure inputs in the sender board and either of the inputs can control one light or device.
Example 7 - 3-Way Switch

Example 8 - Motor Control

- Relay 1 Off Relay 2 Off = Motor Brake to +
- Relay 1 On Relay 2 Off = Motor Forward
- Relay 1 Off Relay 2 On = Motor Backward
- Relay 1 On Relay 2 On = Motor Brake to -
- Induction Capacitor Should Be located by relay
- Filter Capacitor Should be Located Near Motor
- Additional Capacitors May be Desirable for Some Motors
Inductive loads typically require 2-3 times the runtime voltage or amperage when power is first applied to the device. For instance, a motor rate at 5 Amps, 125 VAC will often require 10-15 amps just to get the shaft of the motor in motion. Once in motion, the the motor may consume no more than 5 amps. When driving these types of loads, choose a relay that exceeds the initial requirement of the motor. In this case, a 20-30 Amp relay should be used for best relay life.