UL 497B
voltage after being subjected to 500 discharges from a 0.001 µF capacitor charged to
10,000 V dc. The discharges are applied in five-second intervals between one side of the
protector and Ground. Upon completion of the discharge tests, protectors are once again
required to meet the strike voltage requirement. (Figure 4.13)
Note: The epoxy used to construct a SIDACtor device body meets UL 94V-0 requirements
for flammability.
R1
R2
10 Ω
5 W
50,000 Ω
25 W
C1
V
Test
Specimen
Variable DC Supply
0-1000 V
Figure 4.12 UL 497B Strike Voltage Breakdown Test
Variable
R2
10 Ω
5 W
R1
5 MΩ
50 W
DC Supply *
Spot
Switch
0-12,000 V
C1
V
Test
Specimen
*Or Voltage Capability Necessary to
Develop 10,000 V Across Capacitor
Figure 4.13 UL 497B Discharge Test
© 2002 Teccor Electronics
4 - 31
http://www.teccor.com
+1 972-580-7777
®
SIDACtor Data Book and Design Guide
TECCOR [ TECCOR ELECTRONICS ]
