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4 Channel Relay board

4 Channel Relay

Conveniently Small Size

Our 4 Channel Relay Controller offers a conveniently small size with the integrated power of our standardized PRO relay command set. Quad relay controllers are ideal for computer control applications where small size and high functionality are required.  We offer a large selection of 4 Relay Drivers for applications ranging from low power signal switching to high voltage, high current applications and 4 channel dpdt relay. 

Configurations To Fit Every Need

If your looking for a four channel relay controller we have a configuration to fit every need.  RS-232 Relay controllers allow computer controlled switching using the Serial port of your computer.  Our 4 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 4 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 in signal switching!  Available in USB Relay, 802.15.4 Wireless Relay and RS-232 Relay configurations, the ProXR Series is capable of controlling up to 256 relays.  Whether you need power switching or 4 channel DPDT relay, 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.

4 Channel Relay Controller Boards

Displaying 1 - 50 of 213 Products in this Category.
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ADR410PROXR
Discontinued - See Product description for details
  • 4 Relays - 10 Amp SPDT
  • Serial Communications
  • Ideal Use: Power Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $212.00               Full Description
ADR45PROXR
Discontinued - See Product description for details
  • 4 Relays - 5 Amp SPDT
  • Serial Communications
  • Ideal Use: Power Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $201.00               Full Description
ADSSR4xPROXR
Discontinued - See Product description for details
  • 4 Relays - Optional Amp Solid-State
  • Serial Communications
  • Ideal Use: SS Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $143.00               Full Description
ADSSR4xPROXR_MIX
Discontinued - See Product description for details
  • 4 Relays - Optional Amp Solid-State
  • Serial Communications
  • Ideal Use: SS Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $143.00               Full Description
BTADR410PROXR
Discontinued - This item has been replaced by a new Item, see product description for details
  • 4 Relays - 10 Amp SPDT
  • Bluetooth Communications
  • Range: 328 ft.
  • Ideal Use: Power Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $293.00               Full Description
BTADR45PROXR
Discontinued - This item has been replaced by a new Item, see product description for details
  • 4 Relays - 5 Amp SPDT
  • Bluetooth Communications
  • Range: 328 ft.
  • Ideal Use: Power Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $281.00               Full Description
BTADSSR4xPROXR
Discontinued - This item has been replaced by a new Item, see product description for details
  • 4 Relays - Optional Amp Solid-State
  • Bluetooth Communications
  • Range: 328 ft.
  • Ideal Use: SS Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $281.00               Full Description
BTADSSR4xPROXR_MIX
Discontinued - This item has been replaced by a new Item, see product description for details
  • 4 Relays - Optional Amp Solid-State
  • Bluetooth Communications
  • Range: 328 ft.
  • Ideal Use: SS Switching
  • ProXR Series
  • 8 A/D Inputs
  • XR Expansion Port
           $281.00               Full Description
BTUXPSSR4xPROXR
Discontinued - This item has been replaced by a new Item, see product description for details
  • 4 Relays - Optional Amp Solid-State
  • Bluetooth Communications
  • Range: 328 ft.
  • Ideal Use: SS Switching
  • ProXR Series
  • XR and UXP Expansion Ports
           $281.00               Full Description
BTUXPSSR4xPROXR_MIX
Discontinued - This item has been replaced by a new Item, see product description for details
  • 4 Relays - Optional Amp Solid-State
  • Bluetooth Communications
  • Range: 328 ft.
  • Ideal Use: SS Switching
  • ProXR Series
  • XR and UXP Expansion Ports
           $281.00               Full Description
FOADR410PROXR
Fiber Optic Relay Controller 4-Channel 10 Amp SPDT + 8-Channel 8/10-Bit A/D
  • 4 Relays - 10 Amp SPDT
  • Fiber-Optic Communications
  • Ideal Use: Power Switching
  • ProXR Series
           $224.00               Full Description
FOADR45PROXR
Fiber Optic Relay Controller 4-Channel 5 Amp SPDT + 8-Channel 8/10-Bit A/D
  • 4 Relays - 5 Amp SPDT
  • Fiber-Optic Communications
  • Ideal Use: Power Switching
  • ProXR Series
           $212.00               Full Description
FOADSSR4xPROXR
Fiber Optic 4-Channel Solid State Relay Controller + 8-Channel 8/10-Bit A/D
  • 4 Relays - Optional Amp Solid-State
  • Fiber-Optic Communications
  • Ideal Use: SS Switching
  • ProXR Series
           $212.00               Full Description
FOADSSR4xPROXR_MIX
Fiber Optic 4-Channel Solid State Mixed SSR Relay Controller + 8-Channel 8/10-Bit A/D
  • 4 Relays - Optional Amp Solid-State
  • Fiber-Optic Communications
  • Ideal Use: SS Switching
  • ProXR Series
           $212.00               Full Description
FOUXPSSR4xPROXR
Fiber Optic 4-Channel Solid State Relay Controller + UXP Expansion Port
  • 4 Relays - Optional Amp Solid-State
  • Fiber-Optic Communications
  • Ideal Use: SS Switching
  • ProXR Series
  • XR and UXP Expansion Ports
           $212.00               Full Description
FOUXPSSR4xPROXR_MIX
Fiber Optic 4-Channel Solid State Mixed SSR Relay Controller + UXP Expansion Port
  • 4 Relays - Optional Amp Solid-State
  • Fiber-Optic Communications
  • Ideal Use: SS Switching
  • ProXR Series
  • XR and UXP Expansion Ports
           $212.00               Full Description
KLRR410_802154
Key Fob Relay 4-Channel 10-Amp SPDT + 3-Channel 8-Bit A/D with 802.15.4 Interface
  • 4 Relays - 10 Amp SPDT
  • 802.15.4 Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $282.00               Full Description
KLRR410_USB
Key Fob Relay 4-Channel 10-Amp SPDT + 3-Channel 8-Bit A/D with USB Interface
  • 4 Relays - 10 Amp SPDT
  • USB Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $295.00               Full Description
KLRR410_XSC
Key Fob Relay 4-Channel 10-Amp SPDT + 3-Channel 8-Bit A/D with XSC Interface
  • 4 Relays - 10 Amp SPDT
  • XSC Communications
  • Range: 1 mi. to 15 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $357.00               Full Description
KLRR410_ZBMESH
Key Fob Relay 4-Channel 10-Amp SPDT + 3-Channel 8-Bit A/D with ZB ZigBee Interface
  • 4 Relays - 10 Amp SPDT
  • ZigBee Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $282.00               Full Description
KLRR410_ZBT
Key Fob Relay 4-Channel 10-Amp SPDT + 3-Channel 8-Bit A/D with Bluetooth Interface
  • 4 Relays - 10 Amp SPDT
  • Bluetooth Communications
  • Range: 300 ft.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $347.00               Full Description
KLRR410_ZRS
Key Fob Relay 4-Channel 10-Amp SPDT + 3-Channel 8-Bit A/D with Serial Interface
  • 4 Relays - 10 Amp SPDT
  • Serial Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $294.00               Full Description
KLRR420_802154
Key Fob Relay 4-Channel 20-Amp SPDT + 3-Channel 8-Bit A/D with 802.15.4 Interface
  • 4 Relays - 20 Amp SPDT
  • 802.15.4 Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $328.00               Full Description
KLRR420_USB
Key Fob Relay 4-Channel 20-Amp SPDT + 3-Channel 8-Bit A/D with USB Interface
  • 4 Relays - 20 Amp SPDT
  • USB Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $341.00               Full Description
KLRR420_XSC
Key Fob Relay 4-Channel 20-Amp SPDT + 3-Channel 8-Bit A/D with XSC Interface
  • 4 Relays - 20 Amp SPDT
  • XSC Communications
  • Range: 1 mi. to 15 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $403.00               Full Description
KLRR420_ZBMESH
Key Fob Relay 4-Channel 20-Amp SPDT + 3-Channel 8-Bit A/D with ZB ZigBee Interface
  • 4 Relays - 20 Amp SPDT
  • ZigBee Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $328.00               Full Description
KLRR420_ZBT
Key Fob Relay 4-Channel 20-Amp SPDT + 3-Channel 8-Bit A/D with Bluetooth Interface
  • 4 Relays - 20 Amp SPDT
  • Bluetooth Communications
  • Range: 300 ft.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $393.00               Full Description
KLRR420_ZRS
Key Fob Relay 4-Channel 20-Amp SPDT + 3-Channel 8-Bit A/D with Serial Interface
  • 4 Relays - 20 Amp SPDT
  • Serial Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $340.00               Full Description
KLRR430_802154
Key Fob Relay 4-Channel 30-Amp SPST + 3-Channel 8-Bit A/D with 802.15.4 Interface
  • 4 Relays - 30 Amp SPST
  • 802.15.4 Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $341.00               Full Description
KLRR430_USB
Key Fob Relay 4-Channel 30-Amp SPST + 3-Channel 8-Bit A/D with USB Interface
  • 4 Relays - 30 Amp SPST
  • USB Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $354.00               Full Description
KLRR430_XSC
Key Fob Relay 4-Channel 30-Amp SPST + 3-Channel 8-Bit A/D with XSC Interface
  • 4 Relays - 30 Amp SPST
  • XSC Communications
  • Range: 1 mi. to 15 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $416.00               Full Description
KLRR430_ZBMESH
Key Fob Relay 4-Channel 30-Amp SPST + 3-Channel 8-Bit A/D with ZB ZigBee Interface
  • 4 Relays - 30 Amp SPST
  • ZigBee Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $341.00               Full Description
KLRR430_ZBT
Key Fob Relay 4-Channel 30-Amp SPST + 3-Channel 8-Bit A/D with Bluetooth Interface
  • 4 Relays - 30 Amp SPST
  • Bluetooth Communications
  • Range: 300 ft.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $405.00               Full Description
KLRR430_ZRS
Key Fob Relay 4-Channel 30-Amp SPST + 3-Channel 8-Bit A/D with Serial Interface
  • 4 Relays - 30 Amp SPST
  • Serial Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $352.00               Full Description
KLRR45_802154
Key Fob Relay 4-Channel 5-Amp SPDT + 3-Channel 8-Bit A/D with 802.15.4 Interface
  • 4 Relays - 5 Amp SPDT
  • 802.15.4 Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $271.00               Full Description
KLRR45_USB
Key Fob Relay 4-Channel 5-Amp SPDT + 3-Channel 8-Bit A/D with USB Interface
  • 4 Relays - 5 Amp SPDT
  • USB Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $283.00               Full Description
KLRR45_XSC
Key Fob Relay 4-Channel 5-Amp SPDT + 3-Channel 8-Bit A/D with XSC Interface
  • 4 Relays - 5 Amp SPDT
  • XSC Communications
  • Range: 1 mi. to 15 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $345.00               Full Description
KLRR45_ZBMESH
Key Fob Relay 4-Channel 5-Amp SPDT + 3-Channel 8-Bit A/D with ZB ZigBee Interface
  • 4 Relays - 5 Amp SPDT
  • ZigBee Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $271.00               Full Description
KLRR45_ZBT
Key Fob Relay 4-Channel 5-Amp SPDT + 3-Channel 8-Bit A/D with Bluetooth Interface
  • 4 Relays - 5 Amp SPDT
  • Bluetooth Communications
  • Range: 300 ft.
  • Ideal Use: Power Switching
  • Key-Fob Series
           $335.00               Full Description
KLRR45_ZRS
Key Fob Relay 4-Channel 5-Amp SPDT + 3-Channel 8-Bit A/D with Serial Interface
  • 4 Relays - 5 Amp SPDT
  • Serial Communications
  • Ideal Use: Power Switching
  • Key-Fob Series
           $282.00               Full Description
KLRSSR4x_802154
Key Fob Relay 4-Channel Solid State + 3-Channel 8-Bit A/D with 802.15.4 Interface
  • 4 Relays - Optional Amp Solid-State
  • 802.15.4 Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $271.00               Full Description
KLRSSR4x_802154_MIX
Key Fob Relay 4-Channel Solid State Mix + 3-Channel 8-Bit A/D with 802.15.4 Interface
  • 4 Relays - Optional Amp Solid-State
  • 802.15.4 Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $271.00               Full Description
KLRSSR4x_USB
Key Fob Relay 4-Channel Solid State + 3-Channel 8-Bit A/D with USB Interface
  • 4 Relays - Optional Amp Solid-State
  • USB Communications
  • Ideal Use: SS Switching
  • Key-Fob Series
           $283.00               Full Description
KLRSSR4x_USB_MIX
Key Fob Relay 4-Channel Solid State Mix + 3-Channel 8-Bit A/D with USB Interface
  • 4 Relays - Optional Amp Solid-State
  • USB Communications
  • Ideal Use: SS Switching
  • Key-Fob Series
           $283.00               Full Description
KLRSSR4x_XSC
Key Fob Relay 4-Channel Solid State + 3-Channel 8-Bit A/D with XSC Interface
  • 4 Relays - Optional Amp Solid-State
  • XSC Communications
  • Range: 1 mi. to 15 mi.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $345.00               Full Description
KLRSSR4x_XSC_MIX
Key Fob Relay 4-Channel Solid State Mix + 3-Channel 8-Bit A/D with XSC Interface
  • 4 Relays - Optional Amp Solid-State
  • XSC Communications
  • Range: 1 mi. to 15 mi.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $345.00               Full Description
KLRSSR4x_ZBMESH
Key Fob Relay 4-Channel Solid State + 3-Channel 8-Bit A/D with ZB ZigBee Interface
  • 4 Relays - Optional Amp Solid-State
  • ZigBee Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $271.00               Full Description
KLRSSR4x_ZBMESH_MIX
Key Fob Relay 4-Channel Solid State Mix + 3-Channel 8-Bit A/D with ZB ZigBee Interface
  • 4 Relays - Optional Amp Solid-State
  • ZigBee Communications
  • Range: 300 ft. to 1 mi.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $271.00               Full Description
KLRSSR4x_ZBT
Key Fob Relay 4-Channel Solid State + 3-Channel 8-Bit A/D with Bluetooth Interface
  • 4 Relays - Optional Amp Solid-State
  • Bluetooth Communications
  • Range: 300 ft.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $335.00               Full Description
KLRSSR4x_ZBT_MIX
Key Fob Relay 4-Channel Solid State Mix + 3-Channel 8-Bit A/D with Bluetooth Interface
  • 4 Relays - Optional Amp Solid-State
  • Bluetooth Communications
  • Range: 300 ft.
  • Ideal Use: SS Switching
  • Key-Fob Series
           $335.00               Full Description
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