Its 12V DC 15A Relay, 12V 15A is a general-purpose relay mostly relays are used to perform switching operations without manual touch use to control the flow of current. a general purpose Relays are primarily used as a control circuit (relay sequence) for automated machinery employed at various industrial sites as well as for other control systems including lighting, air conditioning, and water treatment in buildings.

Applications: 

• When galvanic isolation is desired, relays are employed whenever it is necessary to control a high-power or high-voltage circuit with a low-power circuit.
• Lighting control systems.
• Industrial process controllers.
• Traffic control.
• Motor drives control.
• Protection systems of electrical power system.