PolySwitch devices for telecommunication and 
networking applications were initially designed over ten
years ago to meet the growing demand for resettable
overcurrent protection. These product families help
provide protection against damage caused by power
cross and power induction surges as defined in ITU,
Telcordia GR1089, and UL60950. Available in chip,
surface-mount, and radial-leaded configurations,
PolySwitch devices help improve the reliability of
customer premise and network equipment world wide.
Benefits
• Many product choices give engineers more design
flexibility
• Compatible with high volume electronics assembly
• Assist in meeting regulatory equipment requirements
• Improved line balance
• Applicable for legacy POTS and modern digital
communications equipment
Features
• RoHS compliant
• Resettable overcurrent protection
• Surface-mount, radial-leaded, and chip form factors
• Fast time-to-trip
• Agency recognition: UL, CSA, TÜV
• Resistance sorted and matched devices available
• Low parasitic capacitance/flat impedance with
frequency
Applications
• Modems
• Phone sets
• Fax machines
• Phone wall outlets
• Alarm systems
• PBX systems
• MDF modules
• Analog and digital line cards
• T1/E1 equipment
• xDSL modems and splitters
• Powered Ethernet systems
• VoIP (Voice over IP equipment)
• LAN, WAN equipment
• Customer premise equipment
• Access network hardware
