National Instruments Module NI PXI-8250 - Manual (Page 24)

Chapter 3 Hardware Overview
NI PXI-8250 User Manual 3-8 ni.com
The NI PXI-8250 has self-resetting fuses rated at 1 A/125 V on the front
end and one-blow fuses rated at 4 A/125 V on the back end of the card to
protect the card from excessive current draw. Refer to Figure 3-1 for the
locations of these fuses.
When current is exceeded on any of the rails (the current limits are provided
in Table 3-2), the self-resetting fuses will open the circuit. These fuses are
designed to reset themselves and do not need to be repaired.
As a fail-safe, one blow fuses have also been added to ensure that excessive
current is stopped if a self-resetting fuse fails to operate properly. In the
event that any of the one-blow fuses blow, the board must be returned for
repair.
Table 3-2. Fused Power Output Ratings
Voltage Rail Maximum Allowed Current Draw
+5.0 V 0.75 A
+3.3 V 0.75 A
+12.0 V 0.25 A
–12.0 V 0.25 A