Features
 RS-422 / RS-485 protection
 Protection of two full duplex RS-422 data lines or four half duplex RS-485
data lines
 Screw terminal blocks
 Impact and weather resistant
 Locking hinged cover

Description
High voltage transients caused by lightning strikes have the ability to easily destroy semiconductor
junctions, and thus, cause equipment failure and loss. A lightning strike close to data lines can also
cause induced ground currents that can also do serious damage. The AL-D4W-05 high performance
lightning protector provides superior protection of RS-422, RS485 or other 5-volt data lines these
transients or surges.
The low capacitance diode array assures that the RS-422/485 signals will not be degraded by the
suppressor. This is in comparison to protectors based on high capacitance TVS diodes. The unit will
protect two full duplex RS-422 data line or four half duplex RS-485 data lines. For more complete
protection, two units should be used, one on each end of the line.
The compact weather resistant housing features a lockable hinged cover and break-away holes are provided on the rear of the
enclosure for mounting. The cable grommet may be adjusted to cable size and are removable.