SHDSL line external protection unit
SHDSL line external protection unit is designed to protect one two-wire line interface of data communication equipment “Stream-2” from overvoltages and dangerous overcurrents caused by lightning and high voltage power line effects. The external protection unit is installed instead of U links in the long-distance BM boxes. The installation direction from the trunk cable connection to the protected equipment is indicated on the unit case. The unit is connected to the grounding bus by the wire supplied with each protection unit. Chain interconnection of ground wires is prohibited.
|Maximum operating current, at 20°C||250 mA|
|Ambient temperature||-40 to +85°С|
|Added resistance in every core||maximum 7 Ohm|
|Protection operating voltage||550 to 880 V|
|Protection operating time at 3 A||0.8 to 6 sec|