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4 Channel Relay Module Kit, Compact Size 4 Channel Relay Module Receiver Set PCB ABS With Internal Battery For Circuit 5V,12V,24V - Walmart.com
SparkFun Qwiic Quad Solid State Relay Kit - Attach 4 Solid State relays to a Single PCB - Control Some serious Power All from The Easy-to-use Qwiic Connect System - configurable I2C:
ERK - Electronic Relay Kit - Tube Amp Kits & Book - London Power
Temperature Control Switch Module | Relay Control Sensor Pcb Board | Relay Temperature - Relays - Aliexpress
Gen III Replacement Control Board (PCB) Kit for DPI 48V Relay Chargers | Diversified Power International, LLC
4Pin/5PIN Relay Socket For 40A JD Series Auto Relay - Lego Type Socket With Connectors Kit/ With 14+16 AWG Wires/ PCB - Buy 4Pin/5PIN Relay Socket For 40A JD Series Auto Relay -