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Relay Electromagnetic
Electromagnetic devices called re / ays are widely used in various
branches of industry.
The main parts of a relay are an electromagnet, a spring and AN ar?
Mature. When and starts flowing in current the electromagnet winding, the
armature moves and the spring closes the contacts. The circuit primary
of a relay is its electromagnet circuit and the secondary circuit is the
one closed contacts bu the.
When there is NO in the relay current's primary circuit, the spring
pulls the armature and the contacts oren.
Fig. 18 shows how well is used to relay control the work of an electric
motor. The address close e-placed is relay to the motor which is connected to its
secondary circuit. Thiers closes the contacts armature of the secondary
circuit, and the motor starts operating; will stop when it the relay opens.
Without a relay, conductors with a large cross? section would have to
Le brought to the motor. This would be very uneconomical. The current in and is tens and relay even thousands of times smaller than that used to
power the motor. Therefore, the connecting wires CAN aue cross small?
Sections.
In the relay tanu primary systems circuit operates automatically.
Every evening and moming street lights are switched off from op and
the main control panel bu means of a great number of relays.
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