HPS-iSTS-B4 Rack Mounted Static Transfer Switch 250A max

Brand: Static Power

This product is available globally.
  • 1-Phase/2-Pole or 3-Phase/3-Pole or 3-Phase/4-Pole
  • Very high MTBF (>800,000 hours)
  • Integrated maintenance bypass
  • Integrated webserver
  • UPS Eco-Mode compatible



Single & Three Phase Rack Mounted Static Transfer Switch

The iSTS B4 is a high-power capacity rack-mount solid-state Static Transfer Switch – STS – with a hot-socket field-replaceable power module.This STS is ideal for high power installations with the convenience of fitting into a standard 19” rack, perfectly adapted to a large power surge or motor and transformer startup.

Main Features

  • Advanced Automatic Transfer Switch – ATS – functionality
  • Rack-mount 4RU Design
  • Built-in transient voltage protection
  • UPS Eco-Mode compatible
  • Safe asynchronous source transfers
  • Very high MTBF (>800,000 hours)
  • LED mimic decal with graphic OLED interface
  • One-touch transfers
  • Visual and sound alarm
  • Integrated webserver
  • Remote operation
  • High-level interface – MODBUS, SNMP
  • Email alerts
  • Clock synchronisation with NTP
  • Incoming source isolator switches
  • Integrated maintenance bypass with hot socket field-replaceable power module
  • Fixed wiring to input & output terminals for cable up to 70mm²
  • 5 x Voltage free contacts & remote input



  • Back feed protection contactors up to 125A
  • Wall mount bracket

Specifications Table

Current rating1Ph: 250A max 3Ph: 160A max
Voltage ratingAll region-specific voltages selectable ±10%
Type1-Phase/2-Pole, 3-Phase/3-Pole or 3-Phase/4-Pole
Frequency50Hz and 60Hz, ±10% – Auto detection
Transfer typeBreak-Before-Make zero current transfer by Thyristors / SCR
Synchronous break time<1ms – asynchronous break time up to ¼ cycle
MTBF>800,000 hours
Maintenance bypassCradle with 3-position overlapping, no-break CAM switch
IsolationIncoming sources isolator switches
DisplayBi-colour LED mimic decal with graphic OLED display and information interface
InterfacePreferred supply selection, Source transfer selection and Alarm cancel button
Contact2 Self wetting transfer control inputs
5 Voltage free change-over status indicators, Form C
Input optionsFixed wiring to terminals up to 70mm² cables via glands
Output optionsFixed wiring to terminals up to 70mm² cables via glands
Dimensions H x W x D4RU/19″ – 177 x 483 x 650mm
Temperature0 – 45°C
IP ratingIP31
DetectionDigital: <1ms
Asynchronous break time0ms, 10ms, 50ms or Vt proportional, 0° to 180°
Loading0 – 100% @45°C ambient
Device ratings250/300ARMS, 1400V, 3.5kA/5kA 1 cycle
Overload @40°C ambient125% for 10min
200% for 1s
150% for 30s
300% for 0.1s
5kA for 1 cycle
Fault current setting350% peak with load fault transfer inhibit
Safe install environment20kA, 300A internally fused
Protection300A fuses – aR-NGT00
Power factorNo practical limit
Max THDV10% – Max allowable source voltage distortion
Crest factor3.5 : 1
dV/dt max800V/μs
CoolingRedundant fans
Humidity @40°C ambient5 – 95% non-condensing
Regulatory approvalsIEC 62310-1,2,3 – IEC 60950 – IEC 61000-6-1,2,3,4 – CE – RCM – UL Capable – RoHS
Standard warranty24 months offsite repair or replacement policy

Series Table

Model NumberPhases/PolesMax Current 
HPS B4 1P2 00631-Phase/2-Pole63A
HPS B4 1P2 00801-Phase/2-Pole80A
HPS B4 1P2 01001-Phase/2-Pole100A
HPS B4 1P2 01251-Phase/2-Pole125A
HPS B4 1P2 01601-Phase/2-Pole160A
HPS B4 1P2 02501-Phase/2-Pole250A
HPS B4 3P3 00803-Phase/3-Pole80A
HPS B4 3P3 01003-Phase/3-Pole100A
HPS B4 3P3 01253-Phase/3-Pole125A
HPS B4 3P3 01603-Phase/3-Pole160A
HPS B4 3P4 00633-Phase/4-Pole63A
HPS B4 3P4 00803-Phase/4-Pole80A
HPS B4 3P4 01003-Phase/4-Pole100A
HPS B4 3P4 01253-Phase/4-Pole125A
HPS B4 3P4 01503-Phase/4-Pole150A
HPS B4 3P4 01603-Phase/4-Pole160A


View Datasheet

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