Advanced Protection TWL - Manual

The TWL Surge Suppressor is probably different than anything you have seen before.
You will save substantial installation time & rework by understanding the intent behind its
design & installation. Each individual installation is likely to approach a custom installation.
There is reasonable chance that a design team configured and ordered the TWL, as well as multiple individual Surge Protective
Devices (SPDs). Please take a few moments to understand the TWL’s function and the application of each individual SPD.
The TWL is a high quality, high energy, surge suppressor hub assembly. Individual SPDs are connected to the TWL. The purpose
of the TWL is to provide a common ground reference point for individual SPDs, thus ensuring maximum protection to the tower
lighting controller. The TWL also provides the most cost effective ground-level surge protection to uptower lighting equipment.
The TWL is designed to use off-the-shelf APT SPDs in a modular manner. Individual SPDs can be replaced, added to, or field
retrofit. APT SPDs are extremely robust and readily available in a broad application range. This avoids one-off units, which
create cost and availability barriers, and avoids obsolescence issues.
Thank you for choosing an APT TWL Surge Protective Device (SPD). Proper installation is important to maximize performance.
Please follow steps outlined herein. These instructions are not intended to replace national or local codes. Follow all applicable
electrical codes to ensure compliance.
TWL may include several different voltage SPDs including AC and DC voltages. Incorrect initial installation may
result in immediate SPD failure upon start up, not covered by warranty, and/or ineffective surge protection.
APT Welcomes Questions & Pre-installation Discussion at 800.237.4567 or [email protected].
TWL Series Installation Guide
Tower Light Controller Protectors
Also See TWL Datasheet and Configuration Sheet
Cover removed
Cover in place Side view
Mounting holes for
additional SPDs.
4 mounting locations
located on opposite side.
For demonstration purposes, the standard TWL pictured above is displayed with one SPDee on left side, AC Power AC XCS inside and with copper ground strap - not included.