Guangdong Uchi Electronics Co.,Ltd
Guangdong Uchi Electronics Co.,Ltd Manufactuer of Varistor, Thermistor, Capacitor,Fuse & Resistor since 2006 !
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1k ohm PTC Thermistor
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
1,Symbol for the products
| 1-1,Symbol for the products
MZ11 | Note Company symbols MZ11 Type Number |
2,Specifications of Appearance
2-1,Dimensions (mm)
| Number | Name | Technical Requirements | Leads |
| D | Diameter of Resistance | 11.0max | □Straight
□Axis Formed
■In-Forming |
| T | Thickness of Resistance | 5.0max | |
| L | Length of fuse | Min20 | |
| W | Distance between fuses | 5.0±0.5 | |
| d | Diameter of fuse | 0.6±0.05 |
2-2. Coating
| Coating | Material | Color |
| □No coating ■Coating | ■PF resin □Silicon
| ■Yellow □Green
|
3,Electric Performance
| Number | Items | Technical Requirements | Test Conditions |
| 3-1 | Resistant for Zero Rated Power | 1100Ω±20% | Atmosphere Temperature:25±2℃ Accuracy of the Test:±0.5% |
| 3-2 | Over Voltage Withstanding | ≥1000V ΔR/Rn≤20%
| Starting Current:≥200mA, Starting Voltage:220VAC,hold on for 7s,and then change to high voltage800VAC,for 6s.the is shown as follows: Stay under the conditions of regular temperature and humidity for 4-5 hours, and then check the Rn again. |
| 3-3 | Over Current withstanding
| ≥1000mA ΔR/Rn≤20%
| Starting Current:≥600mA,Voltage 220VAC, switch on the circuit for 1 minute after every 5minutes, switch-off, and repeat this operation for 20 times. Put it under the conditions of regular temperature and humidity for 4-5 hours and then check the Rn again |
| 3-5 | Curie Temperature | 75℃ | Check the temperature at 2 times Rn. |
4,Other Performance
| Number | Items | Technical Requirements | Test Conditions |
| 4-1 | Appearance | No noticeable defect, such as, bubbles and micro holes, etc; NO visible damage that may reduce its performance; the symbol is clear | Visual Check |
| 4-2 | Welding | It's tinned evenly and with smooth welds, and the tinned area 95% | Do the test according GB2423-28 of Ta, put welding aid on the faze end and soaked it into the 230℃ tin solution with only 5mm distance to the PTC body above the solution, and maintain for 3-5s. |
| 4-3 | Heat Resistance | Check the variation rate of resistance before and after the test ΔR/Rn≤20% | Do the test according to GB2423-28 of Tb stsy under the regular temperature and humidity for 4-5 hours, and then check the Rn again.Dipping terminals to a depth of 15mm in a soldering bath of 255℃±10℃,and to the place of 6mm far from PTC boby for 3±0.5s |
| 4-4 | Intensity at Fuse end | Check the variation rate of resistance before and after the test ΔR/Rn≤20% No break out | Do the test according to GB2423-29 of U Test Ua: Fasten the body and apply a force gradually to each lead until 10N and then keep for 10sec.hold the body and apply a force to each lead until 90° slowly at 5N in the direction of lead axis and then keey for 10sec,and do this in the opposite direction repeat for other terminal. |
5.0 Part Numbering
|
MZ 6 B 06D 120C 47R N 265V ① ② ③ ④ ⑤ ⑥ ⑦ ⑧
|
| ① MZ—PTC Thermistors ② Symbol for the products: 6—6mm; 8—≥8mm ③ The product applies scope: A—Prepare a hot start,B—Conduct electricity to flow a protection ,C—Temperature sensor ④ Diameter(mm): 08D—8mm ⑤ Curie Temp(℃): 120C—120℃ ⑥ Resistant for Zero Rated Power(Ω):47R—47Ω；4R7—4.7Ω ⑦ Tolerance of Rn: K±10％; M±20％; N±30％ ⑧ Max. operating voltage(V):Vmax— 265V Over Voltage withstanding(V):265V |
6.0 R-T Curve
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
