Ceramic PTC Thermistor Disc Ring 10-55 Ohm for Telecom 250V Surge Protection

Disc disk ring shaped ceramic PTC thermistor stone designed for telecom high voltage current surge protection applications.

• Central Office Switching Equipment (C.O): analog and digital line cards, POTS, T1/E1 equipment, xDSL modems and splitters, multiplexers, CSU/DSU, servers
• Primary Protection Modules: MDF (main distribution frame) modules, network interface devices (NIC)
• Custom Premises Equipment/Subscriber Terminal Equipment (T.E.), IT equipment: Modems, phone sets, fax machines, phone wall outlets, alarm systems, answering machines, PBX systems, ADSL Splitters, internet appliances, POS terminals
• Access Network hardware, LAN WAN equipment, Powered Ethernet systems, VoIP equipment, integrated voice data (IVD), Set-top boxes (S.B)
• Landline telephones or FAX machines
• Telephone interface of STB, VoIP equipment
• Any other communication facility equipment with phone line interface

• Compliant with ITU-T K20 K21 K45 standards
• Basic level lightning surges (10/700μs)
• Basic level power induction (600V, 1A, 0.2S)
• Power contact criteria A/B (230V, 15min.)
• Suitable for continuous connection to main voltage 110/230 VAC in tripped condition
• Round leadless disk thermistor available for combined usage with primary protection
• Thermistor disk coated/non-coated construction, diameter 5mm to 10mm
• Typical Resistance @25°C: 10Ω, 12Ω, 18Ω, 20Ω, 25Ω, 50Ω, 55Ω
• Matching available with narrow resistance tolerance
• Tight resistance tolerance maintained after switching
• Negligible resistance drift after soldering or switching

• Rated Zero-power Resistance (R25): Operating temperature range: 25±2°C, within allowable tolerance
• Non-operating Characteristic: Operating temperature range: 40±2°C, in static air for 30min, Max voltage: 60VDC
• Over-current Operating Characteristic: Operating temperature range: 25±2°C, Max voltage: 220Vrms
• Over Voltage Withstanding: Voltage: 250VAC, Initial current: 3A, Energized time: 30min
• Over Current Withstanding: Max voltage: 220VAC, Initial current: 3A, ON 60S, OFF 600S, Cycle: 30 times
• Surge Current Withstanding: Current waves: 10/1000μS, Peak current: 25A, Cycle: 30 times
• Induction Voltage Current Withstanding: Max voltage: 650VAC, Initial current: 1.1A, Cycle: 10 times
• Fail Model: Multiple voltage and current test conditions with energized time: 30min
• Restore Time: Time to return to twice of R25: ≤60S

Note: Standard Resistance @25°C (R25) allowable tolerance +/-20%, if not specified.