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Ptc Thermistor For Overcurrent And Overload Protection Of Telecom Apparatus Mz2 Series
Posted at: Offers to Sell and Export | Posted on: Friday 27 July 2012 2:21 pm | Poster last visit: Sunday 7 April 2013 |
Product Category: Main
» Electronic Components and Supplies
» Passive discrete components
» Resistors
» Thermistor
» Ptc Thermistor For Overcurrent And Overload Protection Of Telecom Apparatus Mz2 Series
Product Description:
Brief Introduction:
Advanced developments in telephony equipment in rencent years have radically altered
the protection requirements for both exchange and subscriber equipment.The PTC thermistors must protect telephone line circuit against overcurrent, which mainly caused by the following examples:
1)surges due to lighting strikes on or near to the line plant;
2)short-term induction of alternating voltage from adjacent power lines of railway systems, usually caused when these lines or systems occur faults;
3)direct contact between telephone lines and power lines.
Product Application:
They provide reversible, self-resetting protection against overcurrents in：
1.SPC exchange, PBX
2.Distribution frame, main distribution frame (MDF)
3.Security unit
4.Telephone and outdorr telephone
5.Telecom equipment
Working principle:
To provide good protection under such conditions a PTC thermistor is connnected in series with eachline.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 up to 2 KV can occur and in order to withstand short-term power induction the PTC thermistor withstand high voltage.If the line has primary protection, a 220V to 300V PTC thermistor is adequate.Without primary protection, 600V PTC device is necessary.
The restricting overloading protection PTC Thermistor is connected in series in the overloading circuit. when the circuit is in the normal working state, the current flowing through the PTC Thermistor is not high enough to make the temperature exceed the Curie temperature for protection, and the PTC resistor is always in the low resistance state. When the circuit breaks down and the circuit current increases a lot, the resistance of restricting overloading protection PTC Thermistor heating sharply until the circuit is "cut off" relatively to achieve protection purpose. After clearing the circuit trouble, the PTC Thermistor begins to cool and come back to the state of low resistance, and then the circuit enters normal working condition. When the circuit breaks down next time, the PTC Thermistor can enter the state of protection again.
Advantages:
1. Automatic protection, can resume steadily;do not need to be reset after protection
2. Contactless, noiseless and flameless;
3. Reacts fast;
4. With a better performance of withstanding voltage, can operate in 110/230V AC (high resistance state) continuously
5. Low rated current
6. Small steady resistance;
7. Narrow resistance tolerance (resistance matching)
8. Satisfy ITU-T K20 K21 requirement.
--Surge current（10/700µs）
--Induction voltage（600V, 1A, 0.2S）
--Power line contact（230V, 15min.）
9.Long stability
Many specifications for choice, and samples&orders can be custom made per customers' requirement.
Company Contact:
Contact Name: Mary Yeung
Company Name: Shenzhen DXM Technology Co., Ltd
Email:
Tel: 86-755-27522473
Fax: 86-755-27522896
Street Address: Block C, Sanhe
International Science And Technology
Zone, Dalang Street, Baoan District,
Shenzhen, Guangdong 518109 China
Website: http://www.dxmht.com
Member name: DXMresistor
Country: China
Member Since: 27 July 2012
Total Leads: 47 DXMresistor Import Export Business Leads
Business focus: Ptc Thermistor, Ntc Thermistor, Thermal Resistor, Pptc, Sensor, Ptc Heater, Temperature Sensor, Varistor, Capacitor, Sensitive Electronic Components
Verify: Safe Import Export Tips
Advanced developments in telephony equipment in rencent years have radically altered
the protection requirements for both exchange and subscriber equipment.The PTC thermistors must protect telephone line circuit against overcurrent, which mainly caused by the following examples:
1)surges due to lighting strikes on or near to the line plant;
2)short-term induction of alternating voltage from adjacent power lines of railway systems, usually caused when these lines or systems occur faults;
3)direct contact between telephone lines and power lines.
Product Application:
They provide reversible, self-resetting protection against overcurrents in：
1.SPC exchange, PBX
2.Distribution frame, main distribution frame (MDF)
3.Security unit
4.Telephone and outdorr telephone
5.Telecom equipment
Working principle:
To provide good protection under such conditions a PTC thermistor is connnected in series with eachline.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 up to 2 KV can occur and in order to withstand short-term power induction the PTC thermistor withstand high voltage.If the line has primary protection, a 220V to 300V PTC thermistor is adequate.Without primary protection, 600V PTC device is necessary.
The restricting overloading protection PTC Thermistor is connected in series in the overloading circuit. when the circuit is in the normal working state, the current flowing through the PTC Thermistor is not high enough to make the temperature exceed the Curie temperature for protection, and the PTC resistor is always in the low resistance state. When the circuit breaks down and the circuit current increases a lot, the resistance of restricting overloading protection PTC Thermistor heating sharply until the circuit is "cut off" relatively to achieve protection purpose. After clearing the circuit trouble, the PTC Thermistor begins to cool and come back to the state of low resistance, and then the circuit enters normal working condition. When the circuit breaks down next time, the PTC Thermistor can enter the state of protection again.
Advantages:
1. Automatic protection, can resume steadily;do not need to be reset after protection
2. Contactless, noiseless and flameless;
3. Reacts fast;
4. With a better performance of withstanding voltage, can operate in 110/230V AC (high resistance state) continuously
5. Low rated current
6. Small steady resistance;
7. Narrow resistance tolerance (resistance matching)
8. Satisfy ITU-T K20 K21 requirement.
--Surge current（10/700µs）
--Induction voltage（600V, 1A, 0.2S）
--Power line contact（230V, 15min.）
9.Long stability
Many specifications for choice, and samples&orders can be custom made per customers' requirement.
Company Contact:
Contact Name: Mary Yeung
Company Name: Shenzhen DXM Technology Co., Ltd
Email:
Tel: 86-755-27522473
Fax: 86-755-27522896
Street Address: Block C, Sanhe
International Science And Technology
Zone, Dalang Street, Baoan District,
Shenzhen, Guangdong 518109 China
Website: http://www.dxmht.com
Member name: DXMresistor
Country:
ChinaMember Since: 27 July 2012
Total Leads: 47 DXMresistor Import Export Business Leads
Business focus: Ptc Thermistor, Ntc Thermistor, Thermal Resistor, Pptc, Sensor, Ptc Heater, Temperature Sensor, Varistor, Capacitor, Sensitive Electronic Components
Verify: Safe Import Export Tips
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