ITEM NAME:30A Large Current Switch Transfer Board Relay Board Relay Module Internet O N7C2 30A Large Current Switch Transfer Board Relay Board Relay Module Internet O N7C2 The interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient. The Module can be set by jumper high or low trigger. Fault-tolerant design, even if the control line is broken, the relay will not move. 30A high current adapter board, input voltage: DC 12V; control voltage: maximum 250V; control current: maximum 30A. Working principle: The relay is the core of the module, which is equivalent to an electromagnetically controlled switch, and the 12v power supply terminal controls the on and off of the electrical appliance. Material: Electronic Component Color:Black Size: Length x width x height: 55x46.5x22mm/2.17x1.83x0.87inch Package contents:1* Large Current Switch Transfer Board Relay Board