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  6. 250 A 120/208 V 3-Pole eSTS

250 A 208 V 3-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.

Rating 250 A
Voltage 208 V
Poles 3-Pole
Transfer < 4 ms
Service Access Front-Only
Fiber-Optic Controls
Signal paths immune to EMI/RFI
UL 1008S / ETL Listed
Verified transfer performance
Machined Hardware
Connections maintain clamp force over life
Seismic AC156
Shake-table tested
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Black Finish
Gray Finish

Features and Benefits

High-speed transfer
High-Speed Transfer
< 4 ms
3-pole switching
3-Pole Switching
Solid Grounding Continuity
Convection cooling
Convection Cooling
Physics-Driven Reliability
Waveform capture
Waveform Capture
See real-time events
Front-only install
Front-Only Install
No rear or side access required
VDAT plotting
VDAT / ITIC
Disturbance analysis
Seismic rating
Seismic AC156
Shake-table tested
Touchscreen guided bypass
Touchscreen UI
Voice-guided bypass

Compact Footprint. No Side or Rear Access Required.

LayerZero® 120–208V 3-pole eSTS cabinet showing 88-inch height, 48-inch width, and 37-inch depth LayerZero® Series 70 eSTS web-enabled Static Transfer Switch LayerZero eSTS touchscreen displaying system status and bypass controls

Specifications

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Electrical Specifications

Current250 A
Nominal Input Voltage120/208 V
Nominal Output Voltage120/208 V
Poles3
Wires4
Frequency60 Hz
Withstand65 kAIC
Heat Dissipation3,200 BTU/hr (938 W)

Installation & Serviceability

System Mounting TypeFloor / Freestanding
Access SideFront
Front Clearance42 in (1067 mm)
Rear Clearance0 in (0 mm)
Side Clearance0 in (0 mm)
Top Clearance18 in (457 mm)

Mechanical Characteristics

Height80 in (2032 mm)
Width36 in (914 mm)
Depth36 in (914 mm)
Weight1350 lb (612.3 kg)

Documents & Downloads

Static Transfer Switch power system one-line diagram icon showing phase and neutral switching
One-Line Diagram

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.

Outline icon representing a static transfer switch used in mission-critical power systems
Product Outline

A product outline is a technical engineering drawing showing mechanical characteristics of our products.

Guideform specifications icon representing technical requirements for mission-critical power equipment
Guideform Specification

Guideform specifications include the requirements, specifications, and considerations of installing LayerZero equipment.

LayerZero Power Systems brochure cover for mission-critical power solutions
Product Brochure

Product brochures contain information about the product's features, benefits, and specifications.

Fast, Reliable Transfers

Switch to S1
Switch to S2
Tap a source to simulate transfer between redundant feeds.

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

360° Spin

Manufacturing & Quality Assurance

  • Automated machining & robotics
  • Serialized tracking of every critical board
  • 100% end-of-line testing
  • Vertical integration for consistent quality

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