24V 30A Relay Module Optocoupler Isolation High And Low Level Trigger Single Power Features: The relay module is essentially a mechanical switch controlled by an electromagnetic isolation The switch has three ports,normally open,normally closed,and common And has no wires connected to the module's power positive,power negative,and signal terminals It only has the following functions The common and normally open ports are open when the relay is activated And the common and normally closed ports are closed when the relay is activated When the relay is disconnected,the common and normal open are disconnected And the common and normal closed are connected Specification: Product Name:Relay Module Power supply:24V Indicator light:Yes Bolt hole:Yes Product Performance:Strong driving ability, stable Appearance size:about 5.9*4*2.7cm Package includes: 1*24V relay module Note: The product contains a logo,hope you do not mind Dimensions are manually tested and are for reference only Please refer to the actual product,thank you