Thyristor Surge Suppressors
P0080~P3500TA Serise
Figure 1.Examples of protection stages for line cards
Ring
relay
Line
Line
Ex. Analog line card
Ex. xDSL line card or terminal
In such a stage, parallel function is assumed by one or several Trisil, and is used to protect
against short duration surge (lightning). During this kind of surges the Trisil limits the voltage
across the device to be protected at its break over value and then fires. The fuse assumes
the series function, and is used to protect the module against long duration or very high
current mains disturbances (50/60Hz). It acts by safe circuit opening. Lightning surge and
mains disturbance surges are defined by standards like GR1089, FCC part 68, ITU-T K20.
Figure 2. Typical circuits
Fuse TCP 1.25A
Fuse TCP 1.25A
Tip L
T1
Gnd
T2
Fuse TCP 1.25A
Ring L
Tip S
Gnd
Ring S
Typical circuit for subscriber side
Typical circuit for central office side
Figure 3.Test circuit 1 for Dynamic I BO and V BO parameter s
100V/µ s, di /dt< 10 A/ µs, Ipp= XXXA
2
U 10 µF
45
66 470
83
0.36 nF
46 µH
KeyTek 'System 2' generatorw ithP N246I module
1k V/ µs, di /dt< 10 A/ µs, Ipp= 10 A
26 µH
250 47
U 60 µF 12
46 µH
KeyTek 'System 2' generatorw ithP N246I module
TSS 04
All data are subject to changes,Please check our data sheets at www.21Leading.com for updates.