ICP-S Technical Manual
Overcurrent Protection Elements
Rev.A
4/13
4. Selection Flowchart
Type of steady-state current?
DC
No
Yes
No
No
Yes
Yes
Pulse
Surge current
included
Inrush current
included
Check with the I
2
t characteristics graph.
Change the ICP model
to satisfy the condition.
Lower the
open-circuit voltage.
Change the ICP model to
satisfy the condition.
Does the steady-state
current not exceed the rated
current of the ICP?
Is the rated voltage (i.e., the
open-circuit voltage when the ICP
breaks the current) 50 V or below?
Is the breaking current (the maximum
abnormal current) within a range
of 2x to 10x of the ICP's rated current?
The selection is OK.
ICP-S0.5
ICP-S0.7
ICP-S1.0
ICP-S1.2
0.5
0.7
1.0
1.2
1.0 to 5.0
1.4 to 7.0
2.0 to 10.0
2.4 to 12.0
TYPE
Rated current (A)
Breaking current (A)
List of ICP-S Models
The I
2
t-t characteristic graph (i.e., the Joule integral sheet) provides necessary data used to check
how the life of the ICP-S is influenced by heat cycling or mechanical fatigue caused by repetitive
current pulses.
