If you want to switch up to 8 high current / high voltage loads from a micro-controller, this 5V relay board can do it.
It contains 8 x 12V relays rated at 10A/250V AC (DC 30V/10A). Each relay
is switched on/off by an opto-isolated digital input that can be
connected directly to a microcontroller output pin. It only requires a
voltage of approx 1.0V to switch the inputs on but can handle input
voltages up to 5V. This makes it ideal for both 5V and 3.3V devices.
Board Size: 14cm x 5.5cm
A supply voltage of 5V should be connected to the VCC and GND pins.
This is used to power the relay coils when they are switched on. A power
Indicator LED indicates power is supplied.
DO NOT apply power the wrong way round. This can seriously damage the components on the board
Opto-isolated input signals should be supplied between the COM pin
(signal GND) and each input pin. There is a shorting link which links
the signal ground to the power ground. If you want full isolation for
your microcontroller from potentially noisy relays, this link can be
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