A relay is an electromagnetic switch. When a small current flows through the coil in a relay, it creates a magnetic field that pulls one switch contact against or away from another. 

Below are some of the relays that we have: 

• Electro-mechanical Relays 
  Type: SPDT, SPST and Mini-PCB Type
• Reed Relays 
  Type: SPST, DPST, SIP and DIP