Master Switch — static transfer switches (STS) 32–800 A
Country: Italy · Model: Master Switch (MMS / MTS)
Master Switch static transfer switches (STS) rated 32–800 A feed a critical load from two independent sources and transfer it automatically or manually. Single-phase MMS units come in 32, 63 and 120 A, three-phase MTS units in 100–800 A with 3 or 4 poles. They go after two UPS units, or a UPS and the mains, to feed servers with a single power supply.
- Single-phase MMS
- 32, 63 and 120 A
- Three-phase MTS
- 100–800 A, 3- or 4-pole
- Transfer time
- less than a quarter of a cycle (MMS)
- Switching
- thyristor static switches, microprocessor control
Technical specifications
| Single-phase MMS | 32, 63 and 120 A |
|---|---|
| Three-phase MTS | 100–800 A, 3- or 4-pole |
| Transfer time | less than a quarter of a cycle (MMS) |
| Switching | thyristor static switches, microprocessor control |
| Protection | thermomagnetic protection of both sources, backfeed protection (MMS) |
| Maintenance | built-in manual bypass, hot-swappable modules |
| Interfaces | LCD, RS232, programmable dry contacts, communication card slot |
| Customs codes (for reference) | |
| HS code | 8536.50 |
| UKTZED code (Ukraine) | 8536508000 |
| CN code (EU) | 85365080 |
Specifications are taken from the manufacturer’s technical documentation. Updated . Customs codes are for reference only; the final code is determined at customs declaration for the specific model.
Description
Thyristor switches under microprocessor control do the switching, and on the MMS a transfer takes less than a quarter of a cycle, a gap the load's power supplies do not notice. On a short circuit at one consumer the switch disconnects the faulty load and the rest stay in service. Both sources have thermomagnetic protection, so no separate breakers are needed on the inputs. The MMS adds backfeed protection, so a failed switch cannot pass one input's voltage to the other. A built-in manual bypass and hot-swappable modules keep the load fed during service. Control comes via an LCD, an RS232 port, programmable dry contacts and a communication card slot.
How to choose
Size the unit by phase count and load current with inrush margin. A single-phase rack or small panel sits on an MMS 32 or 63 A, a data center switchboard on an MTS, taking the 4-pole version when the neutral must switch too. For a single rack drawing up to 16 or 30 A the Multi Switch rack ATS costs less, and a NetMan 208C card in the MMS or MTS slot shows switch status over SNMP.
Request a price and lead time
Master Switch — static transfer switches (STS) 32–800 A. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is the transfer time of the Master Switch MMS static switch?
Less than a quarter of a mains cycle. Single-phase MMS units come in 32, 63 and 120 A.
What current ratings are available for the three-phase Master Switch MTS?
From 100 to 800 A, with 3 or 4 poles.
What does the STS do when a short circuit occurs at a consumer?
The switch disconnects only the faulty load, and the other consumers keep their supply.
How does a static transfer switch differ from a conventional ATS?
Master Switch moves the load with thyristors, and on the MMS the transfer fits within a quarter of a cycle. A contactor ATS is noticeably slower, and servers with one power supply may reboot.
Can a Master Switch be serviced without dropping the load?
Yes, the load moves to the built-in manual bypass while modules are swapped hot.
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