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Relay, as its name implies, implements a relay function. The relay can be used as a switch operated electrically through the coil to mechanically operate a switch, where it is sometimes necessary to control a circuit of another voltage and current load through a separate low power signal, such as a digital signal emitted by a mircoprocessor. Up to 30V DC and 220V AC.
Mini Relay with 6V Output, Dual Channel.
Light Sensitivity Switch Kit, Velleman.
A Universal Relay Board Kit with 16 Relays and Connectors included! Transformer included. The 12V DC output can be used as a power supply for other kits. Each outlet can be equipped with a noise suppressor.
In/Out Shield for your Arduino, Velleman.
ESP8266 WiFi Remote Control Module with 220V Relay
8 relay module with ports " NC " means " Usually connected to COM " and ports "NO" means " Usually open to COM ".