SONGLE Relay module one channel 5V 250VAC 2 LED Chip for Arduino

SONGLE Relay module one channel 5V 250VAC 2 LED Chip for Arduino

A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations. A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "protective relays".

On its body, you can see these characters and numbers:

• 10A 250VAC
• 10A 125VAC
• 10A 30VDC
• 10A 28VDC
• SRD-05VDC-SL-C
  
  

This is what they mean:

• 10A 250VAC: The max current intensity of connection, where voltage is equal or less than 250V (AC), is 10A and so on
• SRD-05VDC-SL-C: Voltage of signal to control circuit is 5V

State of relay:

It is a switch so it has two main states: close and open

• State open: While opening, it interrupts circuit and current doesn’t work in circuit
• State closed: While closing, it keeps current in circuit

Relay's connections:

There are six connections. Three of these control the state of relay, the others connect to circuit (to make circuit close or open).

How can i connect to Arduino?

For any further information, please visit the following link