Main Technical Data
| Main Technical Data | |
| Rated Voltage | 24kV |
| Rated Current | 630/1250A |
| Rated Frequency | 50Hz |
| Rated Short-time power frequency withstand voltage(1min) | 42kV |
| Rated Lighting impulse withstand voltage | 75kv |
| Rated short-circuit breaking current | 25KA |
| Rated short-circuit making current(peak) | 80kA |
| Breaking operations of rated short circuit breaking current | 20 timies |
| Rated sigle capacitor bank breaking current | 630A |
| Rated short-time withstand current | 25kA |
| Rated peak withstand current | 80kA |
| Rated duration of short-circuit | 4s |
| Mechanica life | 20000times |
| Contact closing force due to bellows and atmosphere | 80±40N |
| Counterforce at rated contact stroke | 120±50N |
| Circuit resistance at rated contact force | ≤25μΩ |
| Shelf life | 20 years |
| Contact erosion limit | 3mm |
| Weight of moving parts | ≤1.2kg |
| Mechanical Data Required for matched vacuum switchgear | |
| Rated contact stroke | 10±1mm |
| Average opening speed | 1.0±0.25m/s |
| Average closing speed | 0.65±0.15m/s |
| Added contact force | 2000±100N |
| Contact bouncing duration at closing operation | ≤2ms |
| Contact bouncing bank amplitude of opening operation | ≤2mm |
| Three-pole simultaneity | ≤1ms |
Dimensional Drawing
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A USB HUB is a device that expands a single Universal Serial Bus (USB) port into several so that there are more ports available to connect devices to a host system, similar to a power strip .
USB hubs are often built into equipment such as computers , keyboards , monitors , or printers . When such a device has many USB ports, they all usually stem from one or two internal USB hubs rather than each port having independent USB circuitry.
Physically separate USB hubs come in a wide variety of form factors : from external boxes (looking similar to an Ethernet or network hub ) connectible with a long cable, to small designs that can be directly plugged into a USB port (see the "compact design" picture). In the middle case, there are "short cable" hubs which typically use an integral 6-inch cable to slightly distance a small hub away from physical port congestion and of course increase the number of available ports.
Laptop computers may be equipped with many USB ports, but an external Usb Hub can consolidate several everyday devices (like a mouse and a printer) into a single hub to enable one-step attachment and removal of all the devices.
USB HUB
Usb3.0 Hub,Usb2.0 Hub,Usb-C Hub,Usb3.1 Type-C Hub
HuiDeGui Technology Development Company Ltd. ,