Categories | PTC Thermistor |
---|---|
Place of Origin: | Dongguan,Guangdong,China |
Brand Name: | UCHI |
Certification: | UL,SGS,ROHS |
Model Number: | PTC Thermistor for Telecom Over-current Protection |
MOQ: | 5000PCS |
Price: | Negotiable |
Packaging Details: | Bulk |
Delivery Time: | 7 working days |
Payment Terms: | T/T,Paypal,Western Union,Money gram |
Supply Ability: | 600,000,000PCS Per Month |
Company Info. |
Guangdong Uchi Electronics Co.,Ltd |
Verified Supplier |
View Contact Details |
Product List |
Positive Temperature Coefficient Thermistor For Telecom Over-current Protection
Quick Details
Compliant with ITU-T K20 K21 K45
--Basic level lightning surges (10/700μs)Suitable for continuous connection to main voltage 110/230 VAC in tripped (high ohmic) condition.
--Basic level power Induction (600V,1A,0.2S)
--Power contact criteria A/B (230V,15min.)
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.
Application
Specification
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.
Typical Resistance @25C (R25) 10 ohm, 12 ohm, 18 ohm, 20 ohm, 25
ohm, 50 ohm, 55 ohm.
Matching available with narrow resistance tolerance.
Tight resistance tolerance maintained after switching.
Negligible resistance drift after soldering or switching.
PTC Thermistors Electrical Performances
Rated zero-power Resistance(R25) |
Non-operating characteristic |
Over-current operating characteristic |
Over voltage withstanding (Power line contact) |
Over current withstanding |
Surge current withstanding |
Induction voltage current withstanding (Only for maximum voltage
more than 600V) |
Fail Model |
Restore time |
Telecom PTC Thermistor Outline and Dimensions (unit:mm)
Fig.1 | Fig.2 | Fig.3 | Fig.4 |
Fig.5 |
PTC Thermistor for Telecom Line Card Protection Application
Part number | Resistance @25C (Ohm) | Non-trip current Int(mA) | Trip current It (mA) | Tripping time at max current (Sec) | Max. current (A) | Max. voltage (V) | Fail model | Dimension (mm) | |||
@25C | @40C | Dmax | Tmax | Φd | |||||||
MZ23-10RM130 | 10 ohm | 130mA | 100mA | 260mA | <0.2s | 1.0A | 250V | 250V/10A | 7.5 | 4.0 | 0.6 |
MZ23-10RM150 | 10 ohm | 150mA | 100mA | 260mA | <0.3s | 2.0A | 250V | 250V/10A | 9.0 | 5.0 | 0.6 |
MZ23-12RM130 | 12 ohm | 130mA | 100mA | 260mA | <0.3s | 2.0A | 250V | 250V/10A | 9.0 | 5.0 | 0.6 |
MZ23-12RM090 | 12 ohm | 90mA | 60mA | 160mA | <0.2s | 2.0A | 250V | 250V/10A | 9.0 | 5.0 | 0.6 |
MZ23-20RM100 | 20 ohm | 100mA | 80mA | 200mA | <0.2s | 3.0A | 250V | 250V/10A | 9.0 | 4.0 | 0.6 |
MZ23-35RM090 | 35 ohm | 90mA | 75mA | 180mA | <0.2s | 3.0A | 250V | 250V/5A | 9.0 | 5.0 | 0.6 |
MZ23-40RM080 | 40 ohm | 80mA | 70mA | 160mA | <0.2s | 3.0A | 250V | 250V/5A | 9.0 | 5.0 | 0.6 |
MZ23-50RM070 | 50 ohm | 70mA | 60mA | 150mA | <0.2s | 3.0A | 250V | 250V/5A | 9.0 | 5.0 | 0.6 |
MZ23-50RM075 | 50 ohm | 75mA | 60mA | 150mA | <0.2s | 3.0A | 650V | 650V/10A | 9.5 | 5.0 | 0.6 |
MZ23-55RM070 | 55 ohm | 70mA | 60mA | 150mA | <0.2s | 3.0A | 650V | 650V/10A | 9.5 | 5.0 | 0.6 |
MZ25-9R0M160 | 9 ohm | 160mA | 130mA | 330mA | <0.8s | 3.0A | 250V | 250V/10A | 10.5 | 4.5 | 0.6 |
MZ25-25RM100 | 25 ohm | 100mA | 80mA | 220mA | <0.2s | 3.0A | 250V | 250V/10A | 6.6 | 4.0 | 0.6 |
MZ25-25RM120 | 25 ohm | 120mA | 100mA | 300mA | <0.4s | 3.0A | 250V | 250V/10A | 8.2 | 4.0 | 0.6 |
MZ26-10RM180SMD | 10 ohm | 180mA | 140mA | 360mA | <5.0s | 1.0A | 250V | 250V/10A | / | / | / |
MZ26-25RM130SMD | 25 ohm | 130mA | 100mA | 270mA | <0.3s | 3.0A | 250V | 250V/10A | / | / | / |
MZ26-50RM090SMD | 50 ohm | 90mA | 70mA | 190mA | <0.2s | 3.0A | 250V | 250V/5A | / | / | / |
MZ26-20RM100SMD | 20 ohm | 100mA | 80mA | 200mA | <0.2s | 3.0A | 250V | 250V/10A | / | / | / |
Note: Standard Resistance @25C (R25) allowable tolerance +/-20%, if not specified.
Part number | Resistance @25C (Ohm) | Non-trip current (mA) | Trip current @25C (mA) | Tripping time at max current (Sec) | Max. current (A) | Max. voltage (V) | Dimension (mm) | |||
@25C | @40C | Dmax | Tmax | Φd | ||||||
MZ21-18RM110 | 18 ohm | 110mA | 90mA | 220mA | <0.15s | 3A | 250V | 5.5 | 1.5 | / |
MZ21-18RM125 | 18 ohm | 125mA | 110mA | 250mA | <0.18s | 3A | 250V | 5.5 | 2.0 | / |
MZ21-18RM130 | 18 ohm | 130mA | 110mA | 260mA | <0.18s | 3A | 250V | 6.2 | 2.0 | / |
MZ21-20RM085 | 20 ohm | 85mA | 70mA | 170mA | <0.18s | 3A | 250V | 6.2 | 2.0 | / |
MZ21-18RM135 | 18 ohm | 135mA | 110mA | 270mA | <0.2s | 3A | 250V | 6.6 | 2.0 | / |
MZ21-10RM150 | 10 ohm | 150mA | 130mA | 350mA | <4.0s | 3A | 230V | 7.2 | 1.5 | / |
MZ25-25RM055 | 25 ohm | 55mA | 45mA | 110mA | <0.4s | 1A | 230V | 5.3 | 4.0 | 0.6 |
MZ25-25RM060 | 25 ohm | 60mA | 50mA | 120mA | <0.4s | 1A | 230V | 5.3 | 4.0 | 0.6 |
MZ25-20RM145 | 20 ohm | 145mA | 100mA | 250mA | <0.2s | 3A | 250V | 6.6 | 4.0 | 0.6 |
MZ25-10RM130 | 10 ohm | 130mA | 110mA | 260mA | <4.0s | 1A | 230V | 6.6 | 4.0 | 0.6 |
MZ25-10RM150 | 10 ohm | 150mA | 135mA | 300mA | <7.0s | 1A | 230V | 8.2 | 4.0 | 0.6 |
MZ25-18RM125 | 18 ohm | 125mA | 110mA | 250mA | <1.0s | 1A | 230V | 5.5 | 4.0 | 0.6 |
MZ23-18RM135 | 18 ohm | 135mA | 110mA | 270mA | <0.2s | 3A | 250V | 7.5 | 4.5 | 0.6 |
MZ23-18RM110 | 18 ohm | 110mA | 90mA | 220mA | <0.2s | 3A | 250V | 9.0 | 4.5 | 0.6 |
MZ23-20RM100 | 20 ohm | 100mA | 80mA | 200mA | <0.2s | 3A | 250V | 9.0 | 4.5 | 0.6 |
MZ23-25RM085 | 25 ohm | 85mA | 75mA | 170mA | <0.7s | 1A | 230V | 6.5 | 5.0 | 0.6 |
MZ23-25RM090 | 25 ohm | 90mA | 70mA | 180mA | <0.2s | 3A | 250V | 9.0 | 4.5 | 0.6 |
Note: Standard Resistance @25C (R25) allowable tolerance +/-20%, if not specified.
Competitive Advantage:
Factory supply directly
Completed certificates such as UL,VDE,SGS,etc and high quality available
Quick delivery
Best after-sales services
OEM & ODM available