|
|
Offer
From Non Premium Member |
|
|
|
Type: |
Sell |
Subject: |
AMWEI PTC Thermistor for Telecom Over-current Protection |
Description: |
Telecom PTC Thermistor Description This series of ceramic PTC (positive temperature coefficient ) thermistors help provide protection against power cross, power induction surges and lighting surge defined in ITU, Telcordia, UL. Available in chip, radial-leaded coated and non-coated, SMD, twin vertical surface mount configuration. PTC thermistor overcurrent protector provides reversible, self-resetting protection against over-currents of telecommunication line protector units, improve the reliability of custom premises and network equipment. Ceramic PTC thermistors can be found providing re-settable line protection at the exchange, monitoring hot spots and protecting ringers, battery feeds, transformers and relay circuits. Also used extensively to protect the mobile phone's battery pack against overcharging in land-based and radio mobile communications. Advanced developments in telecom equipment in recent years have radically altered the protection requirements of both exchange and subscriber equipment. The PTC thermistor must protect the telephone line circuit against overcurrent, which may be caused by the following examples: Surges due to lighting strikes on or near to the line plant. Short-term induction of alternating voltage from adjactent power lines or railway systems, usually caused when these lines or systems develop faults Direct contact between telephone lines and power lines. To provide good protection under such conditions, a PTC thermistor is connected in series with each line, usually as secondary protection; However, even with primary line protection (usually a gas discharge tube), the PTC thermistor must fulfill severe requirements. Surge pulses of upto 2KV can occur and in order to withstand short term power induction, the PTC thermistor must withstand high voltages. If the line has primary protection, a 220V to 300V PTC thermistor is adequate. Without primary protection, 600V PTC device is necessary. We can manufacture a series of PTC thermistor fulfilling both requirements. Typical Application of PTC Thermistor in Telecommunication Protection 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, also known as subscriber terminal equipment (T.E.), IT equipment: Modem, phone sets, fax machines, phone wall outlet (plugs), alarm systems, answering machine, PBX systems, ADSL Splitters, internet appliance, POS terminals. Access Network hardware, LAN WAN equipment, Powered Ethernet systems, VoIP (voice over IP equipment), integrated voice data (IVD), Set-top box (S.B), etc. Telecom PTC Thermistor Features Compliant with ITU-T K20 K21 K45 --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 (high ohmic) condition. Round leadless disk thermistor availble for combined usage of PTC and primary protection, e.g gas arrestor. Matching available with narrow resistance tolerance. Tight resistance tolerance maintained after switching. Negligible resistance drift after soldering or switching. |
Placement Date: |
Jan 30, 2012 |
Expiration Date: |
Jan 28, 2017 |
|
|
|
|
|
|
Company Name: |
AMWEI Thermistor |
Contact Person: |
Rosa |
City: |
Shenzhen |
Country: |
China
|
Local Time: |
|
E-mail: |
Premium
Membership Required (Join Free Today) |
|
Introduction: |
AMWEI Thermistor, professional manufacturer of PTC & NTC thermistors (THERMally sensitive resistors) and thermistor temperature sensors probe. PTC thermistors application cover over-current & overload protection, telecom, lighting switching, motor starting, temperature sensing & protection, self-regulation heating, linear PTC thermistor, silicon temperature sensor, NTC thermistors application cover power thermistor for inrush current suppressing limiting, NTC thermistor for temperature measurement, indicator, temperature compensation, temperature control, in either radial leaded, axial leaded. Can also make custom made thermistor temperature sensor probe assembly, in ring terminal, copper, ABS, Al, stainless steel tube or threaded,to suit screw-in-place, surface, screw thread, chassis, Pipe clip, water liquid immersion temperature measurement application. |
Business Type: |
Exporter, Manufacturer |
Areas of Interest: |
1. Electronics & Electricals/Cables & Wire 2. Electronics & Electricals/Components 3. Electronics & Electricals/Electronic Instruments
|
|