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, 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), Set-top box (S.B), etc.
Telecom PTC Thermistor Features
Compliant with ITU-T K20 K21 K45
Basic level lightning surges (10/700ª¦s)
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.
Supplier: 1) plastic injection molded parts
2) mould design and development
3) automotive plastic parts
4) auto electrical parts
5) industrial/automotive battery parts
6) plastic household products
7) gear moulding
8) over moulding
9) insert moulding
Buyer: 1) copper plated/tin plated terminals for auto electrical parts.
Supplier: Japanese quality switchgear components, breakers, magnetic contactors, switches, pilot lights, pushbuttons, panel instrumentations, power management meter, protection relays, transformers, inverters, ups.
Liquid Cooled Charging Cables are electric vehicle charging cables that utilize liquid cooling to achieve high-speed charging. These cables feature a 500A current rating and a 1000V voltage rating for charging speeds up to 500KW.
Application :- The XLPE (Cross Link Poly Ethylene) Power Cables are used under ground as well as over head transmission of power in power plants, industries, projects and all other electrical installations. Features :- Manufactured from bright annealed 99.97% pure bare copper & aluminum conductors. These cables are insulated with XLPE compound. Taped/Extruded inner sheath. Round steel wire / flat galvanised steel grip armoured. The outer sheaths can be PVC, HR PVC, FRLS or FR depending upon the application and requirement. Technical Advantage of XLPE Insulation :- Higher current rating, higher short circuit rating (approx 1.2 times that of PVC), thermosetting in nature, higher insulation resistance (1000 times more than PVC cables), higher moisture resistance, better resistance to surge currents, low dielectric losses, better resistance to chemicals and corrosion, longer service life. Comparatively higher cable operating temperature 90�°C and short circuit temperature 250�°C. Technical Data :- Working Voltage : Up to 1100 V Temperature Range : -15�°C to +90�°C Power Cable Sizes : 1.50 Sq. mm to 400.00 Sq. mm in 2, 3, 3 Copper Control Cable Sizes : 1.50 Sq. mm, 2.50 Sq. mm up to 24 cores. Color Codes : 2 Core Cables - Red, Black 3 Core Cables - Red, Yellow & Blue 3 Core Cables - Red, Yellow, Blue & Black (for Neutral) 4 Core Cables - Red, Yellow, Blue & Black 5 Core Cables - Red, Yellow, Blue, Black & Grey 6 Core Cables & above - Adjacent cores are blue for reference and yellow for direction in each lay Black outer sheath Specification : IS:7098 (Part-1) Packing : 500 / 1000 meters on drums
Application :- These single core flexible cables are used for wiring in control panels, machines and various electrical installations In small, medium and large industries. Features :- Manufactured from bright annealed 99.97% pure bare copper conductors, these cables have low conductor resistance. These wires are insulated with a special grade PVC compound formulated and manufactured in-house which is impervious to water, oil, grease, acids, etc. and are tough to protect from any mechanical abuses. Technical Data :- Working Voltage : Up to 1100 V Temperature Range : -15�°C to +70�°C Sizes : 0.50 to 50.00 Sq. mm with ISI mark & 70.0 to 40.0 Sq. mm generally conforming to IS:694 Color Codes : Red, Yellow, Blue, Black, Grey, White, Pink, Green, Violet, Brown, Orange Specification : IS:694 Packing : In 90 meter coils, higher sizes in drums.
Application :- These multi core flexible cables are used for wiring in control panels, machines and various electrical installations in dry and damp interiors specially under typical industrial environmental conditions. Features :- Manufactured from bright annealed 99.97% pure bare copper conductors, these cables offer low conductor resistance. These wires are insulated with a special grade PVC compound formulated and manufactured in-house. The tough robust outer PVC jacket protects it from oils, greases and various chemicals and abrasions, thereby giving long life and electrical safety. Technical Data :- Working Voltage : Up to 1100 V Temperature Range : -15�°C to +70�°C Sizes : 0.50 to 4.00 Sq. mm in 2 core to 19 cores & 6.00 to 120.00 Sq. mm in 3 core and 4 core. Color Codes : Black and Grey Outer Sheath 2 Core Cables - Red, Black 3 Core Cables - Red, Black & Green (for Earth) 4 Core Cables - Red, Yellow, Blue & Green (for Earth) 5 Core Cables - Red, Yellow, Blue, Black & Grey Specification : IS:694 Packing : In 90 meter coils, higher sizes in drums.
Application :- The Power Cables are used under ground as well as over head transmission of power in power plants, industries, projects and all other electrical installations. Features :- Manufactured from bright annealed 99.97% pure bare copper & aluminum conductors. These cables are insulated with PVC compound. Taped/Extruded inner sheath. Round steel wire / flat galvanised steel grip armoured. The inner & outer sheaths can be PVC, HR PVC, FRLS, HR-FRLS or FR depending upon the application and requirement. Technical Data :- Working Voltage : Up to 1100 V Temperature Range : -15�°C to +70�°C or +85�°C in HR PVC Power Cable Sizes : 1.50 Sq. mm to 400.00 Sq. mm in 2, 3, 3 & 4 core. Copper Control Cable Sizes : 1.50 Sq. mm, 2.50 Sq. mm up to 24 cores. Color Codes : 2 Core Cables - Red, Black 3 Core Cables - Red, Yellow & Blue 3 Core Cables - Red, Yellow, Blue & Black (for Neutral) 4 Core Cables - Red, Yellow, Blue & Black 5 Core Cables - Red, Yellow, Blue, Black & Grey 6 Core Cables & above - Adjacent cores are blue for reference and yellow for direction in each lay Black outer sheath Specification : IS:1554 (Part-1) Packing : 500 / 1000 meters on drums
PTC thermistors current protector, also called PTC thermistor resettable fuses, protect load against over-current, overload, short circuit. No need for replacement, resume protective function after a short cooling-down time. Ceramic PTC (positive temperature coefficient) thermistors are used instead of conventional fuses to protect load, such as motors, transformers, or electronic circuit, against overcurrent for circuit protection. PTC thermistor protector not only respond to inadmissibly high currents but also if a preset temperature limit is exceeded. PTC thermistor over-current protector limits the power dissipation of the whole circuit by increasing their resistance and thus reducing the current to a harmless residual value. In contrast to conventional fuses, PTC thermistor resettable fuses do not have to be replaced after elimination of the fault but resume their protective function immediately after a short cooling-down time. PTC Thermistor Over-current Protector Application It applies in the over-current overload and short circuit protection of transformers, battery charger, switches, switch power supply, adaptor, meter, instrumentation, apparatus, electronic coils, control panels, air conditioner, automotive electron, etc. Operating Principle of PTC Thermistor for Overload Over-current Protection The operating principle is as indicated in the following. When a circuit is in the normal status, the current through PTC is lower than the rated current and PTC thermistor protector is in the normal state with small resistance value, which will not affect the normal operation of the protected circuit. In case of some fault in the circuit and the current is greater than the rated current, the PTC thermistor protector will become hot quickly and present a high resistance state, which sets the circuit relatively "off" to protect the circuit from damage. After the fault is removed, PTC thermistor protector will automatically restore its low resistance state and the circuit will resume normal operation. Normally, when PTC thermistor is used as an overcurrent protection component, it is preferred to select maximum operating current, maximum operating voltage and proper specifications. Furthermore such factors should be taken into consideration as the dimensions of the components, rated zero-power resistance, operating temperature range, etc.
PTC thermistors current protector, also called PTC thermistor resettable fuses, protect load against over-current, overload, short circuit. No need for replacement, resume protective function after a short cooling-down time. Ceramic PTC (positive temperature coefficient) thermistors are used instead of conventional fuses to protect load, such as motors, transformers, or electronic circuit, against overcurrent for circuit protection. PTC thermistor protector not only respond to inadmissibly high currents but also if a preset temperature limit is exceeded. PTC thermistor over-current protector limits the power dissipation of the whole circuit by increasing their resistance and thus reducing the current to a harmless residual value. In contrast to conventional fuses, PTC thermistor resettable fuses do not have to be replaced after elimination of the fault but resume their protective function immediately after a short cooling-down time. PTC Thermistor Over-current Protector Application It applies in the over-current overload and short circuit protection of transformers, battery charger, switches, switch power supply, adaptor, meter, instrumentation, apparatus, electronic coils, control panels, air conditioner, automotive electron, etc. Operating Principle of PTC Thermistor for Overload Over-current Protection The operating principle is as indicated in the following. When a circuit is in the normal status, the current through PTC is lower than the rated current and PTC thermistor protector is in the normal state with small resistance value, which will not affect the normal operation of the protected circuit. In case of some fault in the circuit and the current is greater than the rated current, the PTC thermistor protector will become hot quickly and present a high resistance state, which sets the circuit relatively "off" to protect the circuit from damage. After the fault is removed, PTC thermistor protector will automatically restore its low resistance state and the circuit will resume normal operation. Normally, when PTC thermistor is used as an overcurrent protection component, it is preferred to select maximum operating current, maximum operating voltage and proper specifications. Furthermore such factors should be taken into consideration as the dimensions of the components, rated zero-power resistance, operating temperature range, etc.
