The Fuse Cutout is connected with the incoming feeder of the distribution transformer or distribution lines. It's mainly used to protect transformers or lines from short circuit and overload and ON/OFF loading current.
The Drop Out Fuse unit is composed of insulator support and a fusion tube, static contacts is fixed on two sides of insulator support and moving contact is installed on two ends of fusion tube. The inside of the fusion tube is the arc-extinguishing tube, the outside is made of phenolic compound paper tube or epoxy glass.Â
Feature
- Low minimum breaking current, low power losses and low arc-voltage;
- High breaking capacity and effective short-circuit prospective current limitation;
- Fuses are the fastest overload protection devices for high short-circuit currents;
- The fuse with the indicator has a safe indication, can show the fusing when the indicator pop-up;
- Superior insulating material, large creepage distance and suitable for different environments;
- The terminal of fusant contacting with the end-plate (or connecting plate) use the technology of spot welding;
- The fusant is made of pure copper strip, the fusion tube is made of high strength china. The extinguishing medium is made of pure quartz sand;
- Compliance to IEC60282-2 standard for full voltage ratings.
Environment Conditions
- Ambient temperature:-40ºC to 40ºC;
- Altitude: ≤1000m altitude(High altitude type≤3000m);
- Relative humidity: Daily average value: ≤95%, Monthly average: ≤90%;
- Wind speed:  ≤35m/s;
- Ice cover thickness: ≤20mm;
- Installation: no explosive and flammable gas, no chemical corrosion and violent vibration place.
Specification
| Model | Rated Voltage (kV) | Rated Current (A) | Breaking current (A) | Impulse voltage BIL (kV) | Power Frequency withstand voltage (kV) | Creepage distance (mm) | Dimension (cm) |
| GKF | 12 | 100 | 6,300 | 110 | 42 | 230 | 38*34*11 |
| 12 | 200 | 8,000 | 110 | 42 | 230 |
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The ONU has two functions: it selectively receives the broadcast sent by the OLT, and responds to the OLT if the data needs to be received; collects and buffers the Ethernet data that the user needs to send, and sends it to the OLT according to the assigned sending window The end sends the buffered data.
The application of ONU can effectively improve the uplink bandwidth utilization of the entire system, and it can also configure the channel bandwidth according to the network application environment and applicable service characteristics to carry as many end users as possible without affecting the communication efficiency and communication quality, and improve the network utilization Rate and reduce user costs.
The concept of Passive Optical Network (PON) has a long history. It has the characteristics of saving optical fiber resources and being transparent to network protocols, and it plays an increasingly important role in optical access networks. At the same time, after 20 years of development, Ethernet technology has almost completely dominated the local area network with its simple, practical, and low-cost characteristics, and in fact has been proved to be the best carrier for carrying IP data packets. As the proportion of IP services in metro and trunk transmission continues to rise, Ethernet is also gradually penetrating access, metro and even backbone networks through improvements in transmission rate and manageability. The combination of Ethernet and PON resulted in the Ethernet Passive Optical Network (EPON). It has the advantages of Ethernet and PON at the same time, and is becoming a popular technology in the field of optical access networks.
EPON is a kind of emerging broadband access technology. It realizes integrated service access of data, voice and video through a single optical fiber access system, and has good economic efficiency. The industry generally believes that FTTH is the ultimate solution for broadband access, and EPON will also become a mainstream broadband access technology. Due to the characteristics of the EPON network structure, the special advantages of broadband access to the home, and the natural organic combination with computer networks, experts all over the world agree that passive optical network is the realization of "three networks in one" and the solution to the information highway The best transmission medium for the "last mile".
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