High quality 8-channel module. Consists of eight switching relays, each of which can switch current up to 10A at 220 volts AC or DC.
The relay coils are powered from 12 volts DC, which allows it to be used in a car.
Overall dimensions 138x56mm, height with leads 20mm. Distances between the centers of the mounting holes: 132 and 50 mm. Hole diameter 3 mm.
The module contains transistor switches, due to which it can be connected directly to microcontrollers (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic), while providing galvanic isolation from the control circuit. The control signal is logical zero.
Diagram of one channel and pinout of the board: