Key Device Selection Citeria
Faster Cooler Surface SiBar Thyristor
Application Specification Time-To-Open Temperature Surge Protectors*
Customer premises equipment, IT equipment UL 60950 FT600-0500 FT600-2000 TVBxxxSC-L
Analog modems, V.90 modems, TIA-968-A FT600-1250
ISDN modems, xDSL modems,
ADSL splitters, phone sets, fax machines,
answering machines, caller ID, internet
appliances, PBX systems, POS terminals, wall plugs
Access network equipment Telcordia GR-1089 FT600-1250 FT600-2000 TVBxxxSC-L
Remote terminals, line repeaters, multiplexers, TIA-968-A
cross-connects, WAN equipment
Central office switching equipment Telcordia GR-1089 FT600-1250 FT600-2000 TVBxxxSC-L
Analog/POTS linecards, ISDN linecards, xDSL modems, TIA-968-A
ADSL/VDSL splitters, T1/E1 linecards,
multiplexers, CSU/DSU, servers
Notes: This list is not exhaustive. Raychem Circuit Protection welcomes our customers’ input for additional application ideas for overcurrent protection of telecom applications.
* For more information on Raychem Circuit Protection SiBar thyristor surge protectors.
To use this guide, follow the steps below:
1. Select your equipment type from the guide below.
2. Use the Key Device Selection Criteria (time-to-open, surface temperature) to determine best suitability for your application.
3. Use Agency Specification / Selection Guide on the next page to select a specific part number for each application based on the agency requirements.
Figure FT1 - Thermal Derating Curve (Normalized) for FT600 Devices
70
80
90
100
110
120
130
-70 -50 -30 -10 10 30 50 70 90 110 130
% of Current Rating
Ambient Temperature °C
Protection Application Guide for Telecommunications and Networking Devices
Family Product Lightning Power Cross
FT600 FT600-0500 TIA-968-A (formerly FCC Part 68) - Type A & B UL60950, 3rd Ed. – 600VAC, 40A
FT600-1250 Telcordia GR-1089 – Level 1 and 2 Telcordia GR-1089 – 600 VAC, 40A
FT600-2000 TIA-968-A UL60950
Use the guide below to select FT600 devices appropriate for use in your application. The following pages contain specifications for part numbers
recommended below. FT600 devices enable telecommunication equipment to meet the applicable protection requirements of these industry
specifications. Refer to individual agency specifications for test procedures and circuit schematics. Users should independently evaluate the suitability
of, and test each product for their application.
Note: FT600-1250 and FT600-2000 are designed to assist equipment in complying with Telcordia GR-1089 specifications. In-circuit testing is strongly recommended.
The FT600-0500, FT600-1250 and FT600-2000 are designed to meet the UL60950 Power Cross and FCC TIA-968-A 68 lightning surge requirements. Note that Type A tests allow for an overcurrent protection
component to fuse open during the surge.
Agency Specification/Selection Guide for FT600 Devices
Part Ampere Rating Voltage Rating Typical Resistance Typical I2t
Number (A)(
V)(
Ω)(
A2S)*
FT600-0500 0.50 250 0.5 1
FT600-1250 1.25 250 0.1 16
FT600-2000 2.00 250 0.05 18
The FT600-xxxx devices are designed to carry 100% of rated current for 4 hours minimum and 250% of rated current for 1 second minimum, 120 seconds maximum.
Resistance measured at 10% of rated current.
*I2t is calculated at 10 ms or less.
Interrupt Voltage and Current Ratings for FT600 Devices
Telecom Fuses
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