Selection Guide for SiBar Thyristor Surge Protectors
Step 1.
Determine the circuit’s operating parameters.
Fill in the following information about the circuit:
Maximum ambient operating temperature ______________________
Maximum DC supply voltage (V
DC
Max.
.
) ________________________
Maximum ringing (AC) voltage (V
AC
Max.) ______________________
System voltage damage threshold
Maximum fault current and duration
Maximum system operating current
Applicable industry requirements
__________________________
__________________________
__________________________
__________________________
Step 2.
Calculate the maximum operating voltage of your system.
Maximum operating voltage = V
DC
Max. + (1.414 x V
AC
Max.)
Refer to Table V1 to select a SiBar thyristor device with a maximum off-
state voltage (V
DM
) rating that is close to, but greater than, the maxi-
mum operating voltage of your system.
Step 3.
Verify that the system voltage damage threshold is
greater than the rated maximum breakover voltage (V
BO
).
Refer to Table V1 to confirm that the maximum breakover voltage of the
device you selected in Step 2 is less than the system voltage damage
threshold.
4
340
SiBar Thyristor Surge Protectors
Raychem Circuit Protection
MA-COM [ M/A-COM TECHNOLOGY SOLUTIONS, INC. ]
