-
- Trade Leads
- Trade Services
- B2B Directories
- Trade Connections
- Misc
- Contact Us
A free import export trade leads B2B marketplace since 1996 for manufacturers, suppliers, exporters, importers, buyers, sellers, wholesalers, freight forwarders, shippers, trade shows, exhibits, and export management.
Hello visitor from
USA - 146 visiting from 137 USA 
3 UK 
2 Germany 
2 Singapore 
1 Canada 
1 Sweden
Hello visitor from
USA - 146 visiting from 137 USA 3 UK 2 Germany 2 Singapore 1 Canada 1 Sweden
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
Chat:
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
Chat:
Verify: Safe Import Export Tips
Similar Suppliers And Manufacturers Import Export Trade Leads
Glass Thermistor Resistor Ntc Thermistor Manufacturers - By jecelectroniccomponents - On Friday 23 September 2022 8:50 am: protection of rechargeable battery packs and chargers
5 temperature compensation for instrument coils integrated circuits quartz crystal oscillato....
Electric Blanket Switches With 3 Heat Settings Led Indicator Overcurrent - By bjrheatingproducts - On Wednesday 13 September 2023 6:59 am: protection system
feature
1 two “off “ function you can turn off the controller from the two sides very convenient
2 blind spot design even....
Lightning Protection Varistor For Sale 120vac - By jecelectroniccomponents - On Friday 23 September 2022 8:53 am: protection against overvoltage transients such as lightning power contact and power induction these 7mm 10mm 14mm and 20mm radial leaded varistors....
Clear Tpu Paint Protection Film - By UPPF - On Thursday 21 December 2023 2:19 am: clear tpu paint protection film
clear ppf with coating technology platicoat™ for stain-resistance is specifically serving our customer besides clear ppf is a transparent adhesive....
Black Protection Full Face Shield Supplier - By Tsafety - On Tuesday 25 October 2022 6:02 am: protection the protective face shield is available in a variety of materials for the bracket and face shield high-impact steel mesh face shield with....
Perma Battery Packs Made Of Panasonic Ncr18650ga And Protection Pcm - By PERMATech - On Thursday 2 March 2023 2:24 am: protection pcm
custom battery pack solutions that can be hand crafted to meet the specific needs and goals of your organization our battery pack ex....
Rechargeable Perma Battery Pack Made Of Panasonic Ncr18650ga And Protection Pcm - By PERMATech - On Thursday 2 March 2023 2:30 am: protection
the battery protection pcm is essential to the safety and performance of a battery pack to protect the battery cells from damage prolong....
Perma Battery Packs Made Of Sanyo18650 And Protection Pcm Leading Connector - By PERMATech - On Thursday 2 March 2023 2:46 am: protection pcm leading connector
custom battery pack solutions that can be hand crafted to meet the specific needs and goals of your organization o.... Import Export Startup Stories
Share Your Story & Get Listed at StartImportExport.com- Nanchang Joyncleon Co Ltd: Lark Chou Of Nanchang Joyncleon Clothing From China
Thermistor Classification Navigation
Main - Electronic Components and Supplies - Passive discrete components - Resistors - Thermistor [75]
TradersCity.com shall not be held liable for any user posted/submitted content including but not limited to trade leads, profiles, images, and any other data. TradersCity.com does not and did not verify any of users posted/submitted data nor is implicitly or explicitly recommending these business offers. TradersCity does not verify truthfulness, accuracy, completeness, nor legality of any businesses, services, and leads posted here. TradersCity does not represent Sellers or Buyers in any transaction between users of the website and is unable to make any opinion in regard to their performance in any transaction. TradersCity neither guarantees nor undertakes in any dispute between sellers and buyers. Protect your business from fraud by trading safely