3EQ composite housed surge arresters save money and space, gaining reliability. With 3EQ used as a support, fewer post insulators are required for installation, thus saving both money and space.
The 3EQ composite surge arresters are designed for outdoor high‑voltage use, offering a tube‑type silicone‑rubber housing that provides high mechanical strength, break‑proof performance and reliable pressure‑relief. Their lightweight, space‑saving design allows replacement of traditional post insulators and even mounting on transformers, reducing installation costs and improving reliability.
The document includes detailed technical tables for nominal system voltage, rated voltage, discharge class, long‑duration current capability and other key parameters, as well as a four‑step guide to select the appropriate arrester type (3EQ1, 3EQ3, 3EQ4).
| Maximum long‑duration current (2 ms) | 850 A (3EQ1), 2100 A (3EQ4), 5500 A (3EQ3) |
|---|---|
| Rated short‑circuit current | 50 kA (3EQ1), 65 kA (3EQ4), 80 kA (3EQ3) |
Follow the four‑step process: choose the type (3EQ1, 3EQ3, or 3EQ4), verify the maximum technical data, select the arrester from the tables, and then decide on installation and grounding.