Mitsubishi MOTORS Laser 1991, Руководство по обслуживанию, Страница: 19 / 320

Coil
Iron
piece
Cover
Spring
Iron
core
Contact
Power supply
I I
Current does not flow
Normal
open
Energized
state
Current flows
This figure illustrates a complex switch. The continuity
between terminals at each position is as indicated in the
table below.
NOTE
denotes continuity between terminals.
1. When current flows through
the coil of a relay, its core is
magnetized to attract the iron piece, closing (ON) the contact
at the
tip
of
the iron piece. When
the coil current 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.
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.