National Control Devices, LLC

World's Largest Manufacturer of Computer Controlled Switching Devices Since 1995.
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Dual Relay Controller Board

Low-Cost 2 Relay Control Board

Large Selection

We offer a large selection of Dual Relay Drivers for applications ranging from low power signal switching to high voltage, high current applications.  If your looking for a two channel relay controller we have a configuration to fit every need.  Our R25/R210 series relay can be controlled at 9600 baud and are compatible with any computer or microcontroller capable of delivering RS-232 data.  Our 2 Channel USB Relay interface mounts as a virtual COM port for easy programming across all major operating systems, ensuring compatibility with all programming languages that support serial connections.  And if your looking for wireless, our 2 Channel 802.15.4 Wireless Relay couldn't be easier!  A 802.15.4 Wireless relay controller offers wireless communications with no special software! 

Latest Advancements

Look for our ProXR series controllers for the latest advancements is signal switching!  Available in USB Relay and 802.15.4 Wireless Relay configurations, the ProXR Series is capable of controlling up to 256 relays.  Whether you need power switching or DPDT 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. For more detailed information and to order, please click on the links below.

2-Channel Relay Boards

R25
2-Channel 5-Amp Latching Relay Board
$59.00
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R210
2-Channel 10-Amp Latching Relay Board
$69.00
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R21DPDT
2-Channel 1-Amp DPDT Small Signal Latching Relay Board
$59.00
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R23DPDT
2-Channel 3-Amp DPDT Signal Latching Relay Board
$64.00
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R25DPDT
2-Channel 5-Amp DPDT High-Current Signal Latching Relay Board
$69.00
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R220
2-Channel 20-Amp SPDT High-Power Latching Relay Board
$79.00
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R230
2-Channel 30-Amp SPST High-Power Latching Relay Board
$89.00
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UADR220PROXR
USB Latching Relay Board 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
$126.00
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UADR230PROXR
USB Latching Relay Board 2-Channel 30 Amp SPST + 8-Channel 8/10-Bit A/D
$136.00
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ADR220PROXR
RS-232 Latching Relay Board 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
$104.00
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ADR230PROXR
RS-232 Latching Relay Board 2-Channel 30 Amp SPST + 8-Channel 8/10-Bit A/D
$114.00
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BTADR220PROXR
Bluetooth Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
$174.00
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BTADR230PROXR
Bluetooth Relay Controller 2-Channel 30 Amp SPST + 8-Channel 8/10-Bit A/D
$184.00
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FOADR220PROXR
Fiber Optic Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
$164.00
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FOADR230PROXR
Fiber Optic Relay Controller 2-Channel 30 Amp SPST + 8-Channel 8/10-Bit A/D
$174.00
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R25RS
Dual Channel 5-Amp SPDT Relay Controller with RS-232 Interface
$69.00
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R210RS
Dual Channel 10-Amp SPDT Relay Controller with RS-232 Interface
$79.00
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R220HPRS
LOW COST Dual Channel 20A SPDT Relay Controller with RS-232 Interface
$34.00
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R220RS
Dual Channel 20A SPDT Relay Controller with RS-232 Interface
$89.00
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R230RS
Dual Channel 30A SPST Relay Controller with RS-232 Interface
$99.00
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R21DPDTCNRS
2-Channel 1-Amp DPDT Relay Controller with RS-232 and Relay Interface
$79.00
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R23DPDTCNRS
2-Channel 3-Amp DPDT Relay Controller with RS-232 and Relay Interface
$84.00
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R25DPDTCNRS
2-Channel 5-Amp DPDT Relay Controller with RS-232 and Relay Interface
$89.00
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ZR21DPDT
2-Channel 1-Amp DPDT 802.15.4 Wireless Relay Controller with Relay Interface
$113.00
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ZR23DPDT
2-Channel 3-Amp DPDT 802.15.4 Wireless Relay Controller with Relay Interface
$118.00
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ZR25DPDT
2-Channel 5-Amp DPDT 802.15.4 Wireless Relay Controller with Relay Interface
$123.00
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ZR25
2-Channel 5-Amp SPDT 802.15.4 Wireless Relay Controller
$93.00
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ZR210
2-Channel 10-Amp SPDT 802.15.4 Wireless Relay Controller
$103.00
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ZR220
2-Channel 20-Amp SPDT 802.15.4 Wireless Relay Controller
$113.00
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ZR230
2-Channel 30-Amp SPST 802.15.4 Wireless Relay Controller
$123.00
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ZR220HP
LOW COST Dual Channel 20A SPDT 802.15.4 Wireless Relay Controller
$58.00
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R21DPDTCN
2-Channel 1-Amp DPDT RS-232 Relay Controller with Relay Interface
$69.00
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R23DPDTCN
2-Channel 3-Amp DPDT RS-232 Relay Controller with Relay Interface
$74.00
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R25DPDTCN
2-Channel 5-Amp DPDT RS-232 Relay Controller with Relay Interface
$79.00
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R220HP
LOW COST Dual Channel 20A SPDT RS-232 Relay Controller
$24.00
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SSR2x
RS-232 2-Channel Solid State Relay Controller
$59.00
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SSR2xRS
RS-232 2-Channel Solid State Relay Controller with RS-232 Interface
$69.00
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ZADR220PROXR
802.15.4 Wireless Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
$139.00
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ZADR220PROXR_ZBMESH
ZB ZigBee Mesh Networking Relay Controller 2-Channel 20 Amp SPDT + 8-Channel 8/10-Bit A/D
$139.00
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ZADR230PROXR
802.15.4 Wireless Relay Controller 2-Channel 30 Amp SPST + 8-Channel 8/10-Bit A/D
$149.00
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ZADR230PROXR_ZBMESH
ZB ZigBee Mesh Networking Relay Controller 2-Channel 30 Amp SPST + 8-Channel 8/10-Bit A/D
$149.00
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ZR210_XSC
XSC Long Range Wireless Controller 2-Channel 10-Amp SPDT
$183.00
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ZR210_ZBMESH
2-Channel 10-Amp SPDT ZB ZigBee Mesh Networking Relay Controller
$103.00
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ZR21DPDT_XSC
XSC Long Range Wireless Controller 2-Channel 1-Amp DPDT
$193.00
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ZR21DPDT_ZBMESH
2-Channel 1-Amp DPDT ZB ZigBee Mesh Networking Relay Controller
$113.00
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ZR220HP_ZBMESH
LOW COST Dual Channel 20A SPDT ZB ZigBee Mesh Networking Relay Controller
$58.00
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ZR220_XSC
XSC Long Range Wireless Controller 2-Channel 20-Amp SPDT
$193.00
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ZR220_ZBMESH
2-Channel 20-Amp SPDT ZB ZigBee Mesh Networking Relay Controller
$113.00
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ZR230_XSC
XSC Long Range Wireless Controller 2-Channel 30-Amp SPST
$203.00
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ZR230_ZBMESH
2-Channel 30-Amp SPST ZB ZigBee Mesh Networking Relay Controller
$123.00
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ZR23DPDT_XSC
XSC Long Range Wireless Controller 2-Channel 3-Amp DPDT
$198.00
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ZR23DPDT_ZBMESH
2-Channel 3-Amp DPDT ZB ZigBee Mesh Networking Relay Controller
$118.00
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ZR25DPDT_XSC
XSC Long Range Wireless Controller 2-Channel 5-Amp DPDT
$203.00
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ZR25DPDT_ZBMESH
2-Channel 5-Amp DPDT ZB ZigBee Mesh Networking Relay Controller
$123.00
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ZR25_XSC
XSC Long Range Wireless Controller 2-Channel 5-Amp SPDT
$173.00
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ZR25_ZBMESH
2-Channel 5-Amp SPDT ZB ZigBee Mesh Networking Relay Controller
$93.00
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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.relaycontrollers.com/