Relays can used switch circuits off distance remotely.
The energizing circuit, the solenoid, completely separate the switch
contacts and, therefore, the relay can switch high voltage, high power cir-
cuits, from low voltage switching circuit.26
A simple relay.
Normally open
switch connection
Normally closed
switch connection
Solenoid coil
Common switch
connection
NO NC
C
FIGURE 10. This gives the relay many appli-
cations motor control circuits, electronics and instrumentation systems.26 shows simple relay.
.Alternating current theory and electrical machines
217
forces.
Figure 10
