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    $39.99
    Sainsmart 16-Channel 9-36V USB Relay Module
    Amazon.com
    Free shipping
    $39.99
    Sainsmart 16-Channel 9-36V USB Relay Module
    Amazon.com
    Free shipping
    $100.95
    $105.95
    Kussmaul Relay Board 4
    Fire Safety USA
    30-day returns (most items)
    $100.95
    $105.95
    Kussmaul Relay Board 4
    Fire Safety USA
    30-day returns
    $234.37
    Pump Relay Board - 2 Or 6 Stations - Triggers Integrated
    Citimarine
    $234.37
    Pump Relay Board - 2 Or 6 Stations - Triggers Integrated
    Citimarine
    $15.99
    Dafurui 5V Relay Module8pack 1 Channel Relay Module 5V Relays Board With Optocoupler Support High/Low Level Trigger For Arduino Relays
    Amazon.com
    75
    $15.99
    Dafurui 5V Relay Module8pack 1 Channel Relay Module 5V Relays Board With Optocoupler Support High/Low Level Trigger For Arduino Relays
    Amazon.com
    75
    $31.64
    LAN Ethernet 2 Way Relay Board Delay Switch TCP/UDP Controller Module WEB Server Great Value
    Aliexpress
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    $31.64
    LAN Ethernet 2 Way Relay Board Delay Switch TCP/UDP Controller Module WEB Server Great Value
    Aliexpress
    Free shipping
    $310.89
    018362831 8 Channel Relay Board - CR1, OF
    Industrial Air Centers
    30-day returns (most items)
    $310.89
    018362831 8 Channel Relay Board - CR1, OF
    Industrial Air Centers
    30-day returns
    $1.65
    $3.27
    DC 5V 12V 24V 1/2/4/6/8 Channel Relay Module Board With Optocoupler Relay Output High- And Low-Level
    Aliexpress
    49% off
    $1.65
    $3.27
    DC 5V 12V 24V 1/2/4/6/8 Channel Relay Module Board With Optocoupler Relay Output High- And Low-Level
    Aliexpress
    $1.33
    5V 12V 1 2 4 6 8 Way Relay Module For Arduino 1 2 4 6 8 Channel Relay Module With Optocoupler Relay
    Aliexpress
    $1.33
    5V 12V 1 2 4 6 8 Way Relay Module For Arduino 1 2 4 6 8 Channel Relay Module With Optocoupler Relay
    Aliexpress
    $9.61
    $13.33
    ESP32 4 Way Relay Module AC 220V 30A ESP32E Module Onboard Supports Development Wi-Fi Bluetooth 4
    Aliexpress
    27% off
    $9.61
    $13.33
    ESP32 4 Way Relay Module AC 220V 30A ESP32E Module Onboard Supports Development Wi-Fi Bluetooth 4
    Aliexpress
    $4.00
    $4.44
    Intermediate Relay Module Trigger Relay Output Control Board Module Relay Module 4/8/10/12/16 Way
    Aliexpress
    Free shipping
    $4.00
    $4.44
    Intermediate Relay Module Trigger Relay Output Control Board Module Relay Module 4/8/10/12/16 Way
    Aliexpress
    Free shipping
    $61.95
    $79.99
    Genuine Nutone 120V Relay Board
    Central Vacuum Direct
    22% off
    $61.95
    $79.99
    Genuine Nutone 120V Relay Board
    Central Vacuum Direct
    $2.96
    1-5PCS 4 Channel Relay Board AVR 51 PIC 5V 12V 4-Channel Relay Module With Optocoupler Relay 4 Way
    Aliexpress
    $2.96
    1-5PCS 4 Channel Relay Board AVR 51 PIC 5V 12V 4-Channel Relay Module With Optocoupler Relay 4 Way
    Aliexpress
    $128.76
    $265.10
    FUNCTIONAL DEVICES, INC. | Seq Board, 4 Relay 24VAC, 0-5/10VDC | RIBMN24Q4C
    Building Controls & Solutions
    30-day returns (most items)
    51% off
    $128.76
    $265.10
    FUNCTIONAL DEVICES, INC. | Seq Board, 4 Relay 24VAC, 0-5/10VDC | RIBMN24Q4C
    Building Controls & Solutions
    30-day returns
    $1.99
    4 Channel Relay Module 4-Channel Relay Control Board With Optocoupler. Relay Output 4 Way Relay
    Aliexpress
    $1.99
    4 Channel Relay Module 4-Channel Relay Control Board With Optocoupler. Relay Output 4 Way Relay
    Aliexpress