Relay is a common controllable switch, in the electrical control inside is very widely used, today we will understand its classification, common classification for three kinds: general relay, control relay, protection relay.
electromagnetic relay
First, the general relay has the role of switch, and protection function, common electromagnetic relay and solid state relay.Electromagnetic relay is actually a kind of electromagnetic relay generally has a coil, through the electromagnetic principle, coil electricity to produce a magnetic field, armature is attracted by the magnetic field, drive the contact action.The common effect is: often open contact closed, often close contact disconnected, when the coil power off, armature under the action of the spring, often open and often closed contact also reset.
solid state relay
Solid state relays are contact switches with electronic circuits inside.As can be seen from the figure above figure, one end is the input end, and the other end is the output end. The output end is a switch. Through the adjustment or control of the input end, the output end is turned and turned on and off.
Two, the common control relay are: intermediate relay, time relay, speed relay, pressure relay and so on
time relay
Intermediate relays are most common and can directly control the load or indirectly the high power load of the AC contactor.Time relays are generally used for delay circuits, such as the common star triangle voltage start, autocoupling transformer voltage start, etc.Speed relay is often used in the reverse braking of the motor, the motor in the braking state speed is approaching zero, cut off the power supply and stop.The pressure relay is pressure sensitive, and the contact moves when the pressure of the liquid reaches a set point.
Three, the protection relay is: thermal overload relay, current relay, voltage relay, temperature relay, etc
Post time: May-20-2022
