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When the switch is on (closed) the external voltage must be dropped across the load
(Figure 75).
CAUTION
The load must be designed such that the current in the circuit is
1 A at all times. Some 3rd party devices, such as incandescent
lamps or solenoids, require surge and back EMF protection to limit
current to
1 A.
Figure 75 Simplified Switch Installation Drawing: Correct Configuration
Without a load, when the switch is on (closed) the external voltage would be dropped across
the switch.
This damages the switch
Figure 76 Simplified Switch Installation Drawing:
Configuration Not Allowed
SVI II ESD
Switch Output:
1 V with
switch ON
External
Voltage
Source
LOAD
Load is designed to ensure that voltage across the switch is < 1 V.
If the load is inductive (solenoid, incandescent
lamp, etc.), then install a Freewheel or Flyback di-
ode to prevent switch damaging EMF voltage
spikes.
+
-
SVI II ESD
Switch
Output
External
Voltage
Source
NOT ALLOWED
Full voltage
drop is
occurring
across the
switch (no
current limit
in place)
+
-
Summary of Contents for SVI II ESD
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