Littelfuse PolySwitch TR Series Radial Leaded PPTCs deliver resettable circuit protection for telecom and networking systems. These devices interrupt overcurrent faults caused by power cross and induction surges per ITU, GR1089, and IEC 62368-1 requirements. The TR series offers fast tripping times, flat frequency impedance, and matched-resistance variants. These components operate at 250VAC to 600VAC with hold currents from 55mA to 400mA, trip currents to 1A, and resistance values between 0.8Ω and 35Ω. The TR series carries UL 1434 recognition and withstands from -40°C to +85°C ambient temperatures. These devices suit applications including analog/digital line cards, VoIP gateways, PBX equipment, and xDSL modems.
Littelfuse TR Series Radial Leaded PPTCs
Features
- ±0.5Ω matched resistance bins
- -40°C to +85°C operating temperature range
- 0.055A to 0.4A hold current
- 0.8Ω to 35Ω resistance ranges
- 250VAC to 600VAC interrupt ratings
- Fast time-to-time performance
Resettable functionality
RoHS-compliant models
UL, CSA, and TÜV approvals
Applications
- Networking machine systems:
- Access network hardware
- Alarm system
- Analog and digital line card
- Customer premise equipment
- Fax machine
- MDF module
- Modem
- PBX system
- Phone set
- Phone wall outlet
- Powered Ethernet system
- T1/E1 equipment
- VoIP (Voice over Internet Protocol)
- xDSL modem and splitter