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It is a 4 Channel Isolated 5V 10A Relay Module Opto-coupler, A wide range of microcontrollers such as Arduino, AVR, PIC, ARM and so on can control it. It is also able to control various appliances and other types of equipment with a large current. Relay output maximum contact is AC250V 10A and DC30V 10A. One can connect a microcontroller with standard interface directly to it. Red working status indicator lights are conducive to the safe use. It has a wide range of applications such as all MCU control, industrial sector, PLC control, smart home control. Ready to get switching on your Raspberry Pi?! This neat relay module features 4 x 5V relays rated at 10A/250V each. It is designed to switch up to 4 high currents (10A) or high voltage (250V) loads with the help of microcontroller! Each relay can individually switch on/off by an opto-isolated digital input, which that can connect 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 1.0V to 5V devices.

Features :

One normally closed contact and one normally open contact
Triode drive, increasing relay coil
High impedance controller pin
Pull-down circuit for the avoidance of malfunction
Power supply indicator and Control indicator lamp
Power supply and relay instructions, lit, the disconnect is off;
The input signal, signal, common Terminal and start conducting;
Useful for appliance control;
DC or AC signal, control, you can control the 220V AC load;
There is a normally open and one normally closed contact;
The module is compliant with international safety standards, control and load areas isolation trenches.