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8 relay module with ports " NC " means " Usually connected to COM " and ports "NO" means " Usually open to COM ".
ESP8266 WiFi Remote Control Module with 220V Relay
In/Out Shield for your Arduino, Velleman.
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.
DFRobot Relay Shield V2.1 is a completely new design which is capable of controlling 4 relays at a time.
The Hexa base rotation kit is perfect for rotating a large mass. It can easily support 5kg . It is injection molded from ultra strong ABS plastic .
Shield of relays for Arduino, with 2 channel mechanical relays and with 2 channel MOS switch , providing an easy way for applications low and high voltage control.