Overcurrent Protection
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2002 Teccor Electronics
SIDACtor
Data Book and Design Guide
To select the most appropriate combination of
TeleLink
SM fuse
and
SIDACtor
device,
decide the regulatory requirement your equipment must meet:
For applications that do not require agency approval or multiple listings, contact the factory.
Power/Line Feed Resistors
Typically manufactured with a ceramic case or substrate, power and line feed resistors
have the ability to sink a great deal of energy and are capable of withstanding both lightning
and power cross conditions.
Advantages
Power and line feed resistors are available with very tight resistive tolerances, making them
appropriate for applications that require precise longitudinal balance.
Restrictions
Because power and line feed resistors are typically very large and are not available in a
surface mount configuration, these devices are less than desirable from a manufacturing
point of view. Also, because a thermal link is typically not provided, power and line feed
resistors may require either a fuse or a PTC to act as the fusing element during a power
cross condition.
Applications
Power and line feed resistors are typically found on line cards that use overvoltage
protectors that cannot withstand the surge currents associated with applicable regulatory
requirements.
Flameproof Resistors
For cost-sensitive designs, small (1/8 W - 1/4 W), flameproof metal film resistors are often
used in lieu of PTCs, fuses, and power or line feed resistors. During a transient condition,
flameproof resistors open when the resultant energy is great enough to melt the metal used
in the device.
Advantages
Flameproof resistors are inexpensive and plentiful.
Regulatory Requirement
TeleLink
SM Fuse
SIDACtor
Device
GR 1089
F1250T
C Series
TIA-968, Type A
F1250T
B Series
TIA-968, Type B
F0500T
A Series
ITU K.20
F1250T
A Series
ITU K.21 Basic/Enhanced
F1250T
A Series
UL 60950
All
All