P6002ACMC datasheet(177/212 Pages) TECCOR

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Overcurrent Protection

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Advantages include:

• Elimination of series line resistance enabling longer loop lengths

• Precise longitudinal balance allowing better transmission quality

• Robust surge performance which eliminates costly down time due to nuisance blows

• Greater surge ratings than resettable devices, ensuring regulatory compliance

• Non-degenerative performance

• Available in surface mount packaging which uses less Printed Circuit Board (PCB) real

estate, eliminates mixed technologies, and reduces manufacturing costs

Weaknesses

Because a fuse does not reset, consideration should be given to its use in applications

where multiple fault occurrences are likely. For example, AC strip protectors and ground

fault interrupting circuits (GFIC) are applications in which an alternative solution might be

more prudent.

Applications

Telecommunications equipment best suited for a fuse is equipment that requires surface

mount technology, accurate longitudinal balance, and regulatory compliance without the

use of additional series line impedance.

Selection Criteria

For circuits that do not require additional series resistance, the surge current rating (IPP) of

the TeleLink SM fuse should be greater than or equal to the surge currents associated with

the lightning immunity tests of the applicable regulatory requirement (IPK).

IPP

³ IPK

For circuits that use additional series resistance, the surge current rating (IPP) of the

TeleLink SM fuse should be greater than or equal to the available surge currents associated

with the lightning immunity tests of the applicable regulatory requirement (IPK (available)).

IPP

³ IPK (available)

The maximum available surge current is calculated by dividing the peak surge voltage (VPK)

by the total circuit resistance (RTOTAL).

IPP

³ IPK (available) = VPK/RTOTAL

For longitudinal surges (Tip-Ground, Ring-Ground), RTOTAL is calculated for both Tip and

Ring.

RTOTAL = RTIP + RSOURCE

RTOTAL = RRING + RSOURCE

For metallic surges (Tip-Ring):

RTOTAL = RTIP + RRING + RSOURCE

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