This Module is based on the G3MB SSR relay which can control up to 2A at 240VAC. This is an 8 Channel SSR relay module, each relay channel has 3 separate terminals, NO (Normal Open), COM (Common), NC (Normal Closed).
A Solid State Relay is similar to a mechanic relay where it can be controlled through a digital signal. Solid State Relay generates no noise and has a much longer lifespan in compared to the traditional mechanic relay.
When the input logic voltage is applied to the coil, the NC will disconnect from the COM breaking the conductivity between the two. At the same time, the NO will connect with the COM allowing conductivity between them. Depending on your wiring this will turn on or off the connected load.
It Can be directly controlled by Arduino and other microcontrollers It is Eight channels relay interface board able to control various appliances and equipment with large current.

Features
Channel: 8 channel 2A Solid State Relay board
Control Voltage: 5V
Working Current: 90mA (Max)
Trigger Voltage: 0 ~ 2.5V (Low level)
Trigger Current: 2mA
Size: 130mm x 60mm x 15mm

Output Rating:
SSR model: G3MB-202P
Isolation: Phototriac
Zero crosses: Yes
Rated load voltage: 100V ~ 240V AC
Load current: 0.10A ~ 2A

Input parts:
DC+: connect positive power.
DC-: connect negative power.
CH1: relay module signal trigger point (effective low-level trigger)
CH2: relay module signal trigger point (effective low-level trigger)
CH3: relay module signal trigger point (effective low-level trigger)
CH4: relay module signal trigger point (effective low-level trigger)
CH5: 5-way relay module signal triggering end (low-level trigger valid)
CH6: 6-way relay module signal triggering end (low-level trigger valid)
CH7: 7-way relay module signal triggering end (low-level trigger valid)
CH8: 8-channel relay module signal triggering end (low-level trigger valid)