This is a 4-Channel Relay interface board. It can be used to control various appliances and other types of equipment with a large current. It can be controlled directly with 3.3V or 5V logic signals from a microcontroller
Specifications and Features:
Trigger mode: High level
Channel: 4 channel
Relay Operating Voltage: 3.3V to 5V
One normally closed contact and one normally open contact
DC or AC signal, control, you can control the 220V AC load;
Triode drive, increasing relay coil
High impedance controller pin
The input signal, signal, common Terminal and start conducting;
Pull-down circuit for the avoidance of malfunction
Power supply indicator and Control indicator lamp
Power supply and relay instructions, lit, a disconnect is off;
Useful for appliance control;
There is a normally open and one normally close contact;
The module is compliant with international safety standards, control, and load areas isolation trenches.