5V 4-Channel Relay Module Low Level Trigger with Optocoupler for Arduino / Raspberry Pi

Package Includes:

1x4-Channel Relay Module

The module complies with international safety standards, the control area and the load area has isolation slot;
Using double-sided FR-4 circuit board design, high-end chip production process;
With power and relay action instructions. relay pull, light bright; relay off , light does not bright;
When the signal input low-level signal, the COM and NO will conduct;
Relay can directly control a variety of devices and loads DC 30V 10A / AC 250VV 10A;
There are 4-NC and 4-NO;
Module Size: 72x41x18.5mm(LxWxH);
Net weight: About 56g;
Module Interface:
1. Input section:
VCC: Connect to the positive terminal of the power supply (it needs to be the same as the nominal voltage of the relay).
GND: Connect the negative power supply
IN1: 1-Channel relay module signal trigger terminal;
IN2: 2-Channe relay module signal trigger terminal;
IN3: 3-Channe relay module signal trigger terminal;
IN4: 4-Channe relay module signal trigger terminal;
2. Output section (relay output):
NO1-4: relay normally open interface;
COM1-4: relay common interface;
NC1-4: Relay normally closed interface;
Trigger side requirements:
When the signal trigger terminal is connected with other modules, it is necessary to connect the ground wire (negative terminal of the power supply) of the two modules together before being effective. 
If the common power source is used, a single signal line can be connected separately.