National Instruments NI PXI-1042 - Manual (Page 6)

NI PXI-1042 Power Supply Shuttle User Guide 6 ni.com
Over-voltage protection
3.3 V and 5 V...................................Clamped at 20 to 30% above
nominal output voltage
+12 V and –12 V .............................Clamped at 26 to 29 V difference
between +12 and –12 V outputs
Power supply shuttle MTTR...................Replacement in under 5 minutes