National Control Devices

National Control Devices, LLC

World's Largest Manufacturer of Computer Controlled Switching Devices Since 1995.
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Due to the US Labor Day holiday, there will be no shipments on Monday, September 6th. Our sales, customer service, and technical teams will not be available. Orders placed on Monday, September 6th, will be processed on Tuesday, September 7th. Please allow one additional day for delivery.

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Dual SPDT Relay

2 Channel SPDT Controller Board

SPDT Single Pole Double Throw Relay

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.

Large Selection

We offer a large selection of Two Channel SPDT Relay Boards for applications ranging from small signal switching to high voltage, high current applications.  If your looking for a 802.15.4 Wireless SPDT Relay, USB SPDT Relay or Bluetooth SPDT Relay we have the largest connection options around.

Latest Advancements

Look for our ProXR series controllers for the latest advancements in signal switching!  The ProXR Series is capable of controlling up to 256 relays.  Control one relay at a time or all 256 relays at once with manual and automatic refreshing command set!  With our SPDT signal switching, the ProXR Series are built from the ground up with Expansion in mind.  Simply Chain the XR Expansion Modules, one after another, to meet your computer controlled switching requirements.  Your system will grow as your needs grow by simply plugging in modules as needed.  All boards in the ProXR Series will have the ProXR suffix in the part number.    For more detailed information and to order, please click on the links below.

2-Channel SPDT Relay Controller Boards

ADR220PROXR
RS-232 Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
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$104.00
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BTADR220PROXR
Bluetooth Wireless Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
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$174.00
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FOADR220PROXR
Fiber Optic Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
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$164.00
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KLRR210_802154
Key Fob Relay 2-Channel 10-Amp SPDT + 1-Channel 8-Bit A/D with 802.15.4 Interface
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$166.00
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KLRR210_USB
Key Fob Relay 2-Channel 10-Amp SPDT + 1-Channel 8-Bit A/D with USB Interface
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$177.00
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KLRR210_XSC
Key Fob Relay 2-Channel 10-Amp SPDT + 1-Channel 8-Bit A/D with XSC Interface
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$231.00
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KLRR210_ZBMESH
Key Fob Relay 2-Channel 10-Amp SPDT + 1-Channel 8-Bit A/D with ZB ZigBee Interface
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$166.00
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KLRR210_ZETH-ME
Ethernet Key Fob Relay 2-Channel 10-Amp SPDT + 1-Channel 8-Bit A/D with ME Firmware
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$216.00
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KLRR210_ZETH-NET
Ethernet Key Fob Relay 2-Channel 10-Amp SPDT + 1-Channel 8-Bit A/D with Web-Browser Interface
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$236.00
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KLRR220_802154
Key Fob Relay 2-Channel 20-Amp SPDT + 1-Channel 8-Bit A/D with 802.15.4 Interface
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$176.00
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KLRR220_USB
Key Fob Relay 2-Channel 20-Amp SPDT + 1-Channel 8-Bit A/D with USB Interface
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$187.00
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KLRR220_XSC
Key Fob Relay 2-Channel 20-Amp SPDT + 1-Channel 8-Bit A/D with XSC Interface
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$241.00
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KLRR220_ZBMESH
Key Fob Relay 2-Channel 20-Amp SPDT + 1-Channel 8-Bit A/D with ZB ZigBee Interface
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$176.00
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KLRR220_ZETH-ME
Ethernet Key Fob Relay 2-Channel 20-Amp SPDT + 1-Channel 8-Bit A/D with ME Firmware
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$226.00
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KLRR220_ZETH-NET
Ethernet Key Fob Relay 2-Channel 20-Amp SPDT + 1-Channel 8-Bit A/D with Web-Browser Interface
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$246.00
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KLRR25_802154
Key Fob Relay 2-Channel 5-Amp SPDT + 1-Channel 8-Bit A/D with 802.15.4 Interface
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$156.00
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KLRR25_USB
Key Fob Relay 2-Channel 5-Amp SPDT + 1-Channel 8-Bit A/D with USB Interface
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$167.00
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KLRR25_XSC
Key Fob Relay 2-Channel 5-Amp SPDT + 1-Channel 8-Bit A/D with XSC Interface
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$221.00
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KLRR25_ZBMESH
Key Fob Relay 2-Channel 5-Amp SPDT + 1-Channel 8-Bit A/D with ZB ZigBee Interface
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$156.00
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KLRR25_ZETH-ME
Ethernet Key Fob Relay 2-Channel 5-Amp SPDT + 1-Channel 8-Bit A/D with ME Firmware
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$206.00
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KLRR25_ZETH-NET
Ethernet Key Fob Relay 2-Channel 5-Amp SPDT + 1-Channel 8-Bit A/D with Web-Browser Interface
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$226.00
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LRR210_ZETH-ME
Ethernet Reactor Relay 2-Channel 10-Amp SPDT + 8-Channel 8-Bit A/D with ME Firmware
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$178.00
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LRR210_ZETH-NET
Ethernet Reactor Relay 2-Channel 10-Amp SPDT + 8-Channel 8-Bit A/D with Web-Browser Interface
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$198.00
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LRR220_ZETH-ME
Ethernet Reactor Relay 2-Channel 20-Amp SPDT + 8-Channel 8-Bit A/D with ME Firmware
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$188.00
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LRR220_ZETH-NET
Ethernet Reactor Relay 2-Channel 20-Amp SPDT + 8-Channel 8-Bit A/D with Web-Browser Interface
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$208.00
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LRR25_ZETH-ME
Ethernet Reactor Relay 2-Channel 5-Amp SPDT + 8-Channel 8-Bit A/D with ME Firmware
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$168.00
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LRR25_ZETH-NET
Ethernet Reactor Relay 2-Channel 5-Amp SPDT + 8-Channel 8-Bit A/D with Web-Browser Interface
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$287.00
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MIRCR210
Wireless Relay Mirror Pair with 2 Contact Closure Inputs and Receiver with 2 Relay 10-Amp SPDT
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$180.00
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MirCR210_MCNET
2-Way LAN and Internet Pair with 2 Contact Closure Sender and Receiver with 2 10-Amp SPDT Relays
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$342.00
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MIRCR220
Wireless Relay Mirror Pair with 2 Contact Closure Inputs and Receiver with 2 Relay 20-Amp SPDT
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$190.00
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MirCR220_MCNET
2-Way LAN and Internet Pair with 2 Contact Closure Sender and Receiver with 2 20-Amp SPDT Relays
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$352.00
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MIRCR25
Wireless Relay Mirror Pair with 2 Contact Closure Inputs and Receiver with 2 Relay 5-Amp SPDT
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$170.00
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MirCR25_MCNET
2-Way LAN and Internet Pair with 2 Contact Closure Sender and Receiver with 2 5-Amp SPDT Relays
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$332.00
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MirXR210
Relay Mirror Pair 2-Controllers Each with Two 10-Amp SPDT Relay and 2 Contact Closure Inputs
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$206.00
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MirXR210_MXNET
2-Way LAN and Internet Communications Enabled Pair with Two 10-Amp Relay + 2 Contact Closure Inputs
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$368.00
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MirXR220
Relay Mirror Pair 2-Controllers Each with Two 20-Amp SPDT Relay and 2 Contact Closure Inputs
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$226.00
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MirXR220_MXNET
2-Way LAN and Internet Communications Enabled Pair with Two 20-Amp Relay + 2 Contact Closure Inputs
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$388.00
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MirXR25
Relay Mirror Pair 2-Controllers Each with Two 5-Amp SPDT Relay and 2 Contact Closure Inputs
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$186.00
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MirXR25_MXNET
2-Way LAN and Internet Communications Enabled Pair with Two 5-Amp Relay + 2 Contact Closure Inputs
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$348.00
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R210
RS-232 2-Channel 10-Amp SPDT Relay Controller Board
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$69.00
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R210PL_802154
ProXR Lite Relay 2-Channel 10-Amp SPDT with 802.15.4 Interface
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$103.00
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R210PL_USB
ProXR Lite Relay 2-Channel 10-Amp SPDT with USB Interface
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$114.00
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R210PL_XSC
ProXR Lite Relay 2-Channel 10-Amp SPDT with XSC Interface
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$123.00
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R210PL_ZBMESH
ProXR Lite Relay 2-Channel 10-Amp SPDT with ZB ZigBee Interface
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$103.00
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R210PL_ZETH-ME
Ethernet ProXR Lite Relay 2-Channel 10-Amp SPDT with ME Firmware
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$153.00
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R210RS
2-Channel RS-232 10-Amp SPDT Relay Controller with RS-232 Interface
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$79.00
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R220
2-Channel RS-232 20-Amp SPDT High-Power Relay Controller Board
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$79.00
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R220HP
LOW COST 2-Channel 20A SPDT RS-232 Relay Controller
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$24.00
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R220HPRS
LOW COST 2-Channel 20A SPDT Relay Controller with RS-232 Interface
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$34.00
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R220PL_802154
ProXR Lite Relay 2-Channel 20-Amp SPDT with 802.15.4 Interface
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$113.00
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R220PL_USB
ProXR Lite Relay 2-Channel 20-Amp SPDT with USB Interface
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$124.00
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R220PL_XSC
ProXR Lite Relay 2-Channel 20-Amp SPDT with XSC Interface
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$133.00
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R220PL_ZBMESH
ProXR Lite Relay 2-Channel 20-Amp SPDT with ZB ZigBee Interface
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$113.00
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R220PL_ZETH-ME
Ethernet ProXR Lite Relay 2-Channel 20-Amp SPDT with ME Firmware
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$163.00
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R220RS
2-Channel 20A SPDT Relay Controller with RS-232 Interface
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$89.00
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R230RS
2-Channel 30A SPST Relay Controller with RS-232 Interface
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$99.00
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R25
RS-232 2-Channel 5-Amp SPDT Relay Controller Board
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$59.00
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R25PL_802154
ProXR Lite Relay 2-Channel 5-Amp SPDT with 802.15.4 Interface
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$93.00
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R25PL_USB
ProXR Lite Relay 2-Channel 5-Amp SPDT with USB Interface
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$104.00
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R25PL_XSC
ProXR Lite Relay 2-Channel 5-Amp SPDT with XSC Interface
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$113.00
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R25PL_ZBMESH
ProXR Lite Relay 2-Channel 5-Amp SPDT with ZB ZigBee Interface
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$93.00
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R25PL_ZETH-ME
Ethernet ProXR Lite Relay 2-Channel 5-Amp SPDT with ME Firmware
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$143.00
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R25RS
RS-232 2-Channel 5-Amp SPDT Relay Controller with RS-232 Interface
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$69.00
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TLR210_802154
Time Activated Relay 2-Channel 10-Amp SPDT with 802.15.4 Interface
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$203.00
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TLR210_USB
Time Activated Relay 2-Channel 10-Amp SPDT with USB Interface
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$214.00
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TLR210_XSC
Time Activated Relay 2-Channel 10-Amp SPDT with XSC Interface
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$223.00
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TLR210_ZBMESH
Time Activated Relay 2-Channel 10-Amp SPDT with ZB ZigBee Interface
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$203.00
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TLR210_ZETH-ME
Ethernet Time Activated Relay 2-Channel 10-Amp SPDT with ME Firmware
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$153.00
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TLR210_ZETH-NET
Ethernet Time Activated Relay 2-Channel 10-Amp SPDT with Web-Browser Interface
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$173.00
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TLR220_802154
Time Activated Relay 2-Channel 20-Amp SPDT with 802.15.4 Interface
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$213.00
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TLR220_USB
Time Activated Relay 2-Channel 20-Amp SPDT with USB Interface
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$224.00
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TLR220_XSC
Time Activated Relay 2-Channel 20-Amp SPDT with XSC Interface
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$233.00
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TLR220_ZBMESH
Time Activated Relay 2-Channel 20-Amp SPDT with ZB ZigBee Interface
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$213.00
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TLR220_ZETH-ME
Ethernet Time Activated Relay 2-Channel 20-Amp SPDT with ME Firmware
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$163.00
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TLR220_ZETH-NET
Ethernet Time Activated Relay 2-Channel 20-Amp SPDT with Web-Browser Interface
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$183.00
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TLR25_802154
Time Activated Relay 2-Channel 5-Amp SPDT with 802.15.4 Interface
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$193.00
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TLR25_USB
Time Activated Relay 2-Channel 5-Amp SPDT with USB Interface
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$204.00
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TLR25_XSC
Time Activated Relay 2-Channel 5-Amp SPDT with XSC Interface
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$213.00
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TLR25_ZBMESH
Time Activated Relay 2-Channel 5-Amp SPDT with ZB ZigBee Interface
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$193.00
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TLR25_ZETH-ME
Ethernet Time Activated Relay 2-Channel 5-Amp SPDT with ME Firmware
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$143.00
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TLR25_ZETH-NET
Ethernet Time Activated Relay 2-Channel 5-Amp SPDT with Web-Browser Interface
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$163.00
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UADR220PROXR
USB Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
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$126.00
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ZADR220PROXR
802.15.4 Wireless Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
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$139.00
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ZADR220PROXR_ZBMESH
ZB ZigBee Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
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$139.00
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Customer Support
About National Control Devices
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National Control Devices, LLC

PO Box 455 - Osceola - MO - 64776
Phone: 417.646.5644 - Fax: 866.562.0406
Open 9AM-4PM Central Standard Time
http://www.controlanything.com/