PP1800SB(2011) 查看數據表（PDF） - ProTek Devices.
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PP1800SB Datasheet PDF : 9 Pages
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application information
PP0640SA - PP3500SC
figure 1 - ul 1459 & fcc part 68 metallic protection
The TSS (Thyristor Surge Suppressor) device is located across the tip-to-ring after a limiting resistor and fuse combination. RTIP and RRING resistors are optional de-
pending upon the TSS device selection. Without the resistors, the PP3100SB/SC is recommended. However, with a resistance value of 7.5 Ohms for tip and ring, the
PP3100SA is recommended. Digital signals may use a lower TSS device depending upon the total tip to ring voltage range. Selection of the TSS device, either PPxxxx-
SA or SB/SC is based upon the value of the tip and ring resistors. For the National Electric Code (NEC) article 800, it is recommended that at least one fuse be used in
the tip or ring line for metallic surges. Fuses may be replaced with a suitable Positive Temperature Coefficient (PTC) automatic resettable current limiting device.
Fuse
RTip
TIP
To Protected
Equipment
RING
RRing
figure 2 - ul 1459 & fcc part 68 longitudinal protection
There are two TSS devices, one located from tip-to-ground and one ring-to-ground. For standard analog signals, the PP3100SA is recommended with a typical resistor
value for tip and ring of 15 Ohms. The PP3100SB/SC is recommended for resistor values of 7.5 Ohms each. The National Electric Code (NEC) article 800 requires two
fuse elements when connecting to ground. Fuses or a suitable Positive Temperature Coefficient (PTC) automatic resettable current limiting device may be used. The
purpose of this circuit is to limit AC power current from getting on the ground line causing any safety hazard.
RTip
TIP
To Protected
Equipment
RING
RRing
05081.R11 2/11
Page 5
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