Description
HPS-iSTS-B2
Single & Three Phase Rack Mounted Static Transfer Switch
With a MTBF of 800,000 hours, Static Power’s 19″ rack iSTS are dedicated to applications requiring a high level of reliability. Within a compact size of 2RU, the Model B2 features as standard a hot-swappable power module and integrated
maintenance bypass enabling continuous power during servicing.With up to 63A of three-phase or up to 125A single-phase current capacity, this model is ideal for those needing more power in a small rackmount package.
The iSTS continuously monitors the supply sources for failure or degeneration and switches automatically to the alternate source as required to protect the load against failure. The break in the supply transition is so short that it is not seen by the critical load. This switching process is undertaken as a break before make transfer, preventing overlapping which can cause large and unpredictable currents. In 2 and 4-pole models, all the active conductors and the neutral are switched. In 3-pole models, only the active phases are switched. Thyristors are used to undertake the switching process.
In the case of downstream load fault conditions, the fault current drawn from the supply may degrade or damage the supply sources; as a consequence should a fault current exist in the load the iSTS will inhibit a transfer to the alternate source even if this causes source supply degradation or loss. This is to ensure that the fault will not be transferred to the alternate supply with the possibility of degrading both sources.
The current threshold for isolation is pre-set to approx. 300% of the rated current. This unit contains fuses. The fuses are to provide for safe operation even in high fault capacity environments. It should be noted that the fuses are for the protection of the semiconductor switches (SCRs/ Thyristors), not the load. The iSTS does not have any automatic tripping devices, so load discrimination is undertaken in the primary and secondary supply networks.
Main Features
- Advanced Automatic Transfer Switch – ATS – functionality
- 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 web server
- Remote operation
- High-level interface – MODBUS, SNMP
- Email alerts
- Clock synchronisation with NTP
- Integrated maintenance bypass with hot socket field-replaceable power module
- Incoming source isolator switches
- Redundant fan cooling
- Fixed wiring to input & output terminals for cable up to 16mm²
- 5 x voltage-free contacts & remote inputs
