Applications and Features

Applications:
 Protection of RS-422/485, RTDs and T1/E1/J1 Lines

Features:
 Three-Stage Protection
 Superior to diode or TVS only based
designs
 Impact and weather resistant enclosure
with locking hinged cover
 Screw Terminal Blocks

Description
The AL-D2W-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.
Outdoor Use
The compact weather resistant housing features a lockable hinged cover and mounting holes are provided on the rear of the
enclosure for mounting. The two cable grommets may be adjusted to cable size and are removable.
Application Note:
Not for use with T1 line with Ring or DC Power.