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Applications

? RS-422/485 lines

? RTD lines

? T2/E1/J1 lines

Features

? Three stage protection

? Superior to diode or TVS only based designs

? Screw terminal blocks

? Industrial grade weatherproof die cast

aluminum enclosure with mounting

brackets

Description

The ALW-D2-05 is HyperLink’s outdoor version of its HGLN-D2-05 protector. This high

performance 3-stage lightning protector provides superior protection of differential or

balanced digital or analog lines from transients and surges. The units will protect two pairs

of differential data or analog signal/control lines.

The first stage is comprised of a differential gas discharge tube. Stage two is a pair of

current limiting series resistors and the final stage is a low capacitance diode array. The

use of three terminal differential gas discharge tubes provides superior common and

differential mode protection against conducted transients versus the use of lower cost two

terminal tubes. The second stage series resistance limits the power dissipation of the fast

diode clamp array in the third stage. This allows time for the slower but higher power gas tubes to flash over. The diode array

clamps the leading edge of fast transients to safe levels until the high power gas tubes turn on. This eliminates the damaging

leading edge spike that single stage gas tube protectors let leak through. The diode array’s low capacitance assures that the

suppressor will not degrade the high-speed signals. The 3-stage design can handle higher-level transients than a protector that

uses only diodes.

For more complete surge protection of data lines, the use of two units is recommended, one at

each end of the line.

Industrial Grade Weatherproof Enclosure

This protector features an industrial grade die cast aluminum enclosure with gasketed cover

and concealed mounting holes. It includes an aluminum mounting kit and hardware. PG16

cable glands are provided on the enclosure as well as an external ground clamp provided a tie

point for earth ground.