Datasheet:

Features:
1, DIN rail mount 8 channel SPDT 10Amp power relay module. Supports control by Raspberry-Pi, Arduino, ESP32, STM32, MCU, DSP, PLC etc. 
2, Each channel has a direct control switch. Even without a controller, the relay can be controlled by these toggle switches. When the switch is set to ON, the relay action. When the switch is set to AUTO, the relay no action. If an external controller is connected, setting the switch to AUTO will accept GPIO control from the external controller.
3, Each channel has a relay status indicator light, and the green PWR indicator light indicates the power supply VCC. This module must be connected to the power supply VCC (version DC 5V, 12V, 24V or 48V), otherwise any control will be invalid.
4, Terminal blocks: Pitch 5.0mm/0.197", Wire range 26AWG - 12AWG / 2.5mm square. Rated current 16 Amp. Strip length 7mm. Screws M2.5
5, High quality fireproof nylon material DIN rail mount carrier, can support width 35mm, 32mm or 15mm rail. 
6, Aluminum top cover and laser marking. If you buy in bulk, we can support marking custom logo and other content.
7, UL CE CQC certified terminal blocks. UL 94-V0 certified PCB, and UL CE certified DIN rail mount carrier.