6
2.5 .
Reed Relay and Protection Circuit
Inductive Load
Capacitive Load
When there is flow, factory settings of the flow switch is normally closed.
When flow stopped, contact is open.
When reed switch is used for loads such as electromagnetic relay ,contactor or solenoid, reed switch may be exposed to very high
voltage depending on value of inductive load. This causes either failure of switch or shortening its service life. Therefore, it is
recommended to be used as follows depending on used voltage, for the purpose of protection of switch.
When reed switch is used with capacitive load, it may cause that high current passes over reed switch, depending on value of
capacity during Charge '96 Discharge of capacity. So this may cause failure of switch. It is recommended to be used as follows
depending on used voltage, for the purpose of protection of switch.
SPST-NO
Single Pole-Single Throw
Normally Open
SPST-NC
Single Pole-Single Throw
Normally Closed
SPDT-NO/NC
Single Pole-Double Throw
Open / Closed Contact
Glass Tube Contact
Inert Gas Magnetic Reed
Wire
Relay Position
15
35
NONC
Black
Blue
Reed Relay
NC
NO
Inductive Load Inductive Load
Inductive Load
Diod
DC
AC AC
C R Varistor
Neon Lamp
AC
R
AC
C
R
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