Applications and Features

Applications:
 Protection of Sensors, Control Lines and RS-232 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
Superior Performance
The AL-D2W-12 is HyperLink’s outdoor version of its HGLN-D2-12 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 highspeed 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.