Maxima 3PH A3R ISO — three-phase online UPS 15–80 kVA with isolation transformer
Country: United Kingdom · Model: Maxima 3PH A3R ISO
The Maxima 3PH A3R ISO three-phase online UPS, rated 15–80 kVA, has a built-in isolation transformer at the output. It is installed at telecom, transport and power sites, and in workshops with harsh operating conditions, where the load must be galvanically isolated from the mains.
- Power
- 15–80 kVA
- Input/output
- 3/3
- Topology
- online, double conversion, DSP
- Isolation
- built-in output transformer
Technical specifications
| Power | 15–80 kVA |
|---|---|
| Input/output | 3/3 |
| Topology | online, double conversion, DSP |
| Isolation | built-in output transformer |
| Parallel operation | yes |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The 3/3 scheme means a three-phase input and a three-phase output, so the unit feeds motors, panels and distributed single-phase groups without unbalancing one phase. The double-conversion topology with DSP digital control continuously forms the output voltage through the inverter, so mains sags and surges do not reach the loads. The output transformer gives galvanic isolation between the inverter and the load and attenuates common-mode noise, which matters for relay protection, communication systems and industrial process control. A separate isolation transformer next to the cabinet is not needed, since it is already inside. The units support parallel operation, so the system can be expanded in power or a spare unit can be kept in hot standby.
How to choose
Choose the size by the total load power in kVA with a margin for motor starting currents, within the 15–80 kVA range of the series. If galvanic isolation is not needed, a simpler option is the Maxima 3PH A3R at 30–80 kVA with cos φ 1.0 and efficiency up to 96 % in online mode. For small three-phase loads there is the Maxima 3PH UR at 10, 15, 20 kVA, and the Maxima 3PH A2R with parallel operation of up to 4 UPS is designed for 100–200 kVA.
Request a price and lead time
Maxima 3PH A3R ISO — three-phase online UPS 15–80 kVA with isolation transformer. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
Why does an online UPS need an output isolation transformer?
The transformer galvanically separates the load from the mains and the inverter and attenuates noise. In the Maxima 3PH A3R ISO it is built into the cabinet, so a separate 15–80 kVA isolation transformer does not need to be bought.
What is the power range of the Maxima 3PH A3R ISO?
The series covers 15–80 kVA with a three-phase input and a three-phase output (3/3). For larger loads the units are connected in parallel.
How does the A3R ISO differ from the standard Maxima 3PH A3R?
The standard A3R has a range of 30–80 kVA and an output cos φ of 1.0, but no built-in output transformer. The ISO version starts at 15 kVA and has an isolation transformer for sites that need galvanic isolation.
Can several Maxima A3R ISO UPS be connected in parallel?
Yes, parallel operation is provided. It is used to increase power above 80 kVA or for redundancy, when one unit is taken out for maintenance.
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