SE8205 Datasheet, PDF (4/9 Pages) Shanghai Leiditech Electronic Technology Co., Ltd – Thyristor Surge Suppressors

Figure 1.E
xamples of protection stages for line cards
Ring
relay
Line
Line
Thyristor Surge Suppressors
P0060~P3500SA_B_C Series
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
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