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This 5V 4 Relay Shield Module is a small current signal control power equipment commonly used electronic module
Enabling high-power single-chip control devices are widely used in SCM system to make smart home project
Can be directly plugged into the compatible the use of various types of motherboards, eliminating the patch cable troubles.
This relay module is 5V active low.
It is a 4-channel relay interface board, which can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM, PLC, etc.
It is also able to control various appliances and other equipment with large current. Standard interface can be directly connected with microcontrollers.
Red working status indicator lights are conducive to the safe use.
Widely used for all MCU control, industrial sector, PLC control, and smart home control.
Working voltage: 5V
Channel: 4 channel
Color: Blue
Item size: approx. 7.1 x 5 x 1.3cm
Net weight: 41.3g

Features:

Standard For Shield interfaces and shape
Can continue to stack other For expansion boards
3 M3 screw positioning holes for easy installation
High Drive (5V or 3.3V) normally open contact closure
Onboard relay indicator (red)
Note: When using the For UNO board connected to it, because UNO USB interface is extremely high, should avoid green terminals are shorted its shell.

Relay Shield Interfaces:

Relay: 5V DC relay, HJR-4102-L-5V, the Relay1 is be behalf of the 1st relay, the same for others.
Power Interface: 5V DC Power Indicator: four lights are red when the relay is driven high , the corresponding indicator will light up.

Relay Terminals:

Terminal high-power , high-current high voltage can be connected to the device .
The 1st foot ( i.e. NOx) is a normally open pin , NCx pin is normally closed , COMx is common, i.e., when the relay is not driven , NOx and COMx open between two pins , NCx and COMx connection ; When the relay (x) control signal pin is high drive relays , NOx and COMx connection open between NCx and COMx.

Package Included: