delta-enclosure-stp-files.zip
The 1S27 is a high‑speed optical arc fault protection relay designed for air‑insulated metalclad switchgear.
It provides rapid detection and signalling of arc flash events, improving personnel safety and reducing equipment damage.
The relay supports arc‑only or current‑checked protection schemes, allowing flexible integration with existing protection relays. Housed in a compact Delta size 2, 2U enclosure, the 1S27 offers versatile mounting options and plug‑in terminals to simplify installation and retrofit applications.
