The 1 Channel Relay Module is much more than just a plain relay, it contains components that make switching and connection easier and act as indicators to show if the module is powered and if the relay is active.
First is the screw terminal block. This is the part of the module that is in contact with mains so a reliable connection is needed. Adding screw terminals makes it easier to connect thick mains cables, which might be difficult to solder directly. The three connections on the terminal block are connect to the normally open, normally closed, and common terminals of the relay.
The second is the relay itself, which, in this case, is a blue plastic case. Lots of information can be glean from the markings on the relay itself. The part number of the relay on the bottom says “05VDC”, which means that the relay coil is activate at 5V minimum – any voltage lower than this will not be able to reliably close the contacts of the relay. There are also voltage and current markings, which represent the maximum voltage and current, the relay can switch. For example, the top left marking says “10A 250VAC”, which means the relay can switch a maximum load of 10A when connected to a 250V mains circuit. The bottom left rating says “10A 30VDC”, meaning the relay can switch a maximum current of 10A DC before the contacts get damage.
The ‘relay status LED’ turns on whenever the relay is active and provides an indication of current flowing through the relay coil.
The power LED is connect to VCC and turns on whenever the module is powered.
Single-Channel Relay Module Applications
- Mains switching
- High current switching
- Isolated power delivery
- Home automation
1 x 1 Channel Relay Module
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