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5 4 3 2
Coil
Iron
Normal op6
Deenergized state
Energized state
X
Current does not flow
Current flows
GENERAL
2. SWITCH CONNECTION
This figure illustrates a complex switch. The continuity
between terminals at each position is as indicated in the
table below.
4th stage
CHECKING RELAYS
Cover
1. When current flows through the coil of a relay, its core
Spring
is magnetized to attract the iron piece, closing (ON) the
contact at the tip of the iron piece. When the coil current
Iron
core
is turned off, the iron piece is made to return to its original
position by a spring, opening the contact (OFF).
2.
By using a relay, a heavy current can be turned on and
off by a switch of small capacity. For example, in the circuit
shown here, when the switch is turned on (closed), current
flows to the coil of the relay. Then, its contact is turned
on (closed) and the light comes on. The current flowing
at this time to the switch is the relay coil current only
and is very small.
1
3. The relays may be classified into the normal open type
and the normal close type by their contact construction.
NOTE
The deenergized state means that no current is flowing
through the coil and the energized state means that current
is flowing through the coil.
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