General Relay

A general-purpose relay can also be called the electromagnetic relay. 

The difference between electromagnetic relay and electrical relay is 

that electronic relays rely on the delayed energization of the resistance-capacitance 

elements to control the contact on and off of the relay action. Electromagnetic relays 

make the airbag inflating or deflating the process of driving the contacts on and off through 

the coil energization or power-off release.