Features: Support all microcontroller control. Industrial field; PLC control; home intelligent control. Adopts high current relay, AC250V 10A DC30V 10A. The parts of the contacts are independently wired, safe and reliable. Standard interface for expansion on various development boards. Fixed screw holes for easy installation and suitable for various platforms such as 51/AVR/ARM. This module complies with international safety standards, and the control area and the load area have isolation slots. The use of double-sided FR-4 circuit board design, high-end patch production. With relay action indication, the suction is bright, the disconnection is not bright. When the signal input terminal has a low level signal, the common terminal and the normally open terminal will be turned on. The relay can directly control various equipment and load. There are 8 normally open and 8 normally closed contacts. The blue KF301 terminal is more convenient to connect to the control line. Specification: Voltage: 5V/12V(Optional ) Module Size:138 x 56 x 18.5mm / 5.43 x 2.2 x 0.73in Weight: 115g/4.06oz Hole Diameter: 3.1mm / 0.12in Hole Interval Length:131 x 49.5mm / 5.16 x 1.95in Wiring Diagram: VCC: Connected to the positive pole of 12V power supply. GND: Connect the negative pole of 12V power supply. IN1-IN8: Signal trigger terminal, active low level. Relay output: 12-line interface, all interfaces can be directly connected to facilitate user access. NO1--NO8: Relay normally open interface, the relay is suspended before the suction, short-circuit with COM after the suction. COM1--COM8: Relay common interface. NC1--NC8: Relay normally closed interface, short-circuit with COM before the pull-in of the relay, and float after the suction. Package List: 1 x Module