Phase-Over-Phase Switches

Reduced installation time and improved reliability

Southern States’ patented foldable-frame transmission switch installs faster and delivers long-term dependability.

The Southern States ES-1 side break switch simplifies field installation and long-term operation by combining a foldable, pre-assembled design with an intuitive contact mechanism that eliminates common sources of operator error. Available in one-way, two-way, and three-way configurations, the ES-1 reduces average installation time by 50%, thanks to a collapsible frame that ships fully assembled on insulators and unfolds easily in the field.

Engineered with a non-rotational blade and enhanced contact geometry, the ES-1 ensures consistent jaw seating regardless of closing speed or operator technique. By drawing from the proven design principles of the EC-1 center break switch — while expanding contact surface area — the ES-1 provides reliable performance even in challenging conditions such as ice, galloping lines, and long-term mechanical wear. With fewer adjustments required at installation and over time, it’s a robust, lower-maintenance solution for modern transmission applications.

Key Benefits:

1. Faster, simpler installation with a collapsible frame that ships fully assembled on insulators
2. Reliable performance in all conditions thanks to non-rotational blade and stable contact geometry
3. Low-maintenance design with maintenance-free bearings and fewer adjustment points over time
4. Flexible mounting options including horizontal upright, phase-over-phase, or phase-opposite-phase
5. High-conductivity components like silver-to-silver jaw contacts and rigid aluminum blades
6. Customizable base and interruption options including single- or double-channel base and arc horns, whips, or LLS® interrupters
7. Standardized terminal interface with 4-hole NEMA tin-plated copper pads
8. Backed by Southern States' 24/7 after-sales support and long-life engineering