250 A 120/208 V 4-Pole eSTS
LayerZero® eSTS keeps mission-critical loads online by transferring between sources in < 4 ms, using fiber-optic based control logic and a voice-guided bypass procedure that reduces operator error. Designed for maximum uptime in mission-critical data centers. Fully serviceable from the front in a 48" x 36" x 90" footprint.
Features and Benefits
Compact Footprint. No Side or Rear Access Required.
Specifications
Electrical Specifications
| Current | 250 A |
|---|---|
| Nominal Input Voltage | 120/208 V |
| Nominal Output Voltage | 120/208 V |
| Poles | 4 |
| Heat Dissipation | 4,800 BTU/hr (1.41 kW) |
Installation & Serviceability
| Front Clearance | 36 in (914 mm) |
|---|---|
| Rear Clearance | 0 in (0 mm) |
| Side Clearance | 0 in (0 mm) |
| Top Clearance | 18 in (457 mm) |
Mechanical Characteristics
| Height | 90 in (2286 mm) |
|---|---|
| Width | 48 in (1219 mm) |
| Depth | 36 in (914 mm) |
| Weight | 1600 lb (725.7 kg) |
Documents & Downloads
A one-line diagram is a symbolic representation of three-phase electric power systems, depicting the paths for power flow between entities of the power distribution system.
A product outline is a technical engineering drawing showing mechanical characteristics of our products.
Guideform specifications include the requirements, specifications, and considerations of installing LayerZero equipment.
Product brochures contain information about the product's features, benefits, and specifications.
Fast, Reliable Transfers
Automatic Source Transfer in <4 ms
eSTS continuously monitors both sources and instantly moves the load when instability is detected. Transfers occur without contact welding or nuisance trips.
Fiber-optic control paths and triple modular redundancy protect continuity even during upstream events.
- < 4 ms typical transfer time
- Triple Modular Redundancy (TMR)
- Fiber-optic signaling
Unlike 3-pole systems, the 4-pole eSTS switches the neutral conductor as well as all phases. This ensures precise isolation between sources, eliminating circulating currents and neutral potential differences - critical for sensitive IT loads and transformer-isolated systems.
360° Spin
Photo Gallery
Manufacturing & Quality Assurance
- Automated machining & robotics
- Serialized tracking of every critical board
- 100% end-of-line testing
- Vertical integration for consistent quality
Talk to LayerZero Sales
Tell us what you are building and we’ll route your request to the right team.