Holdvolt P11 / P31 / P33
Power-Utility UPS for Substations, 1–120 kVA
Inverter-type UPS that runs from the station battery, for relay rooms, control buildings and plant DCS.
- 1–120kVA
- Cabinet and rack
- DC 110 / 220V
- Station battery input
- 0ms
- Mains to DC
- ≤1ms
- Inverter to bypass
How it works
Double conversion, then an isolation transformer before the load.
- 0 ms
- mains to battery
- Isolation
- galvanic, inverter to load
- Neutral
- re-established at the transformer
Supply
- Station DC 110 / 220 V
- AC mains
- Static bypass
Environment
- -10 to 50 °C
- To 2000 m
Options
- Dry contacts
- RS-485
- SNMP
- Harmonic compensation
Specifications
Factory catalog values, model by model.
P11 / P31 / P33
| Model | P11 | P31 | P33 |
|---|---|---|---|
| Other | |||
| Capacity range | 1-30KVA | 6-120KVA | 10-120KVA |
| Protection: DC voltage (battery) | Low-battery auto shutdown; Auto restart when utility returns; Miniature circuit breaker protection | ||
| Protection: over-temperature | Internal temperature >85°C: auto transfer to bypass | ||
| Protection: output short circuit | Current limiting; Auto shutdown; Miniature circuit breaker protection | ||
| Protection: UPS fault | Auto transfer to bypass; load powered by utility. | ||
| Noise filter | 10–100KHz at 40dB;100KHz–100MHz at 70dB | ||
| Options | dry contact / RS485 / SNMP adapter / harmonic compensation cabinet / I/O distribution cabinet / I/O isolation cabinet; surge protection / bypass voltage stabilizer cabinet / custom cabinet size / 1–30 kVA TRS rack version | ||
| Input | |||
| Phase | Single-phase | 3-phase | 3-phase |
| Rated voltage | AC220V±25% | AC380V±25% | AC380V±25% |
| Rated frequency | 50HZ±5%,60HZ±5% | ||
| Bypass | |||
| Phase | Single-phase | 3-phase | 3-phase |
| Rated voltage | AC220V±25% | AC380V±25% | AC380V±25% |
| Rated frequency | 50HZ±5%,60HZ±5% | ||
| Frequency tracking rate | ≤1Hz/S | ||
| Output | |||
| Rated voltage | Single-phase AC220V±1% | Single-phase AC220V±1% | 3-phase AC380V±1% |
| Rated frequency | 50 Hz / 60 Hz ± 0.05 (battery mode) | ||
| Power factor | ≥0.8 | ||
| Waveform | Sine wave | ||
| THD | linear load <2%; non-linear load <3% | ||
| Crest factor | 3:1 (max) | ||
| Overload | |||
| Overload capability | 125% for 10 min; 150% for 1 min; auto recovery when load returns to normal | ||
| Protection: overload | Overload (120–150%): auto transfer to bypass after 60 s; auto recovery when load returns to normal. | ||
| Transfer time | |||
| Transfer time (utility failure) | 0ms | ||
| Transfer time (inverter/bypass) | ≤1ms | ||
| Battery | |||
| DC voltage (battery) | DC110/220V | ||
| DC voltage range | DC93-137V/184-275V | ||
| Display & communication | |||
| Alarm: utility failure | Buzzer beeps once every 4 seconds | ||
| Alarm: utility abnormal | Buzzer beeps once every 4 seconds; Utility-mode indicator flashes | ||
| Alarm: battery low | Buzzer beeps once every 1 second; Battery-mode indicator flashes; Low-battery LED on | ||
| Alarm: overload | Overload LED on; Continuous buzzer | ||
| Alarm: UPS fault | Fault LED on; Continuous buzzer | ||
| Control panel | LCD+LED | ||
| LCD display | Displays UPS status; input/output voltage, input/output frequency, battery voltage, output load (%), inverter temperature. | ||
| Low-battery indicator | On when battery voltage is low | ||
| Overload indicator | On when overloaded | ||
| Fault indicator | On when fault occurs | ||
| UPS status | Utility mode; Battery mode; Inverter; Bypass; UPS abnormal | ||
| Communication port | RS232/RS485 (optional remote network monitoring) | ||
| Efficiency | |||
| Efficiency (full load) | 91% | 92% | 95% |
| Environment | |||
| Operating temperature | -10°C–50°C | ||
| Relative humidity | 30%–90% RH (non-condensing) | ||
| Altitude | < 2000 m (derate 1% per +100 m; max. 4000 m) | ||
| Noise (1 m in front) | 48–55dB | 53–65dB | 55–65dB |
| Physical | |||
| Cabinet color | Grey-white (RAL 7032/7035); Black (optional) | ||
| Dimensions (W×D×H) mm | 800×600×2260/800×800×2260; 1000×800×2260/1200×800×2260 | ||
| Weight (kg) | Depends on configuration | ||
Factory values. Specifications may change; confirm against the quotation.Swipe the table sideways.
Where it fits
Applications and guides for this range.
Power Substations
Relays, SCADA, RTUs and communication equipment in a substation need clean AC power when station supply is disturbed. Our P-series power utility UPS is built for that control-room duty.
GuideIndustrial Isolation Transformer UPS: When Galvanic Isolation Matters
An isolation transformer breaks the direct conductive path between mains and load. In an industrial uninterruptible power supply it lets you create a clean new neutral, block common-mode noise and ride out the earthing problems that high-frequency units pass straight through.
Questions buyers ask
What do you need for a quotation?
Load in kVA or kW, input voltage and phases, output phases, the backup time you need and where the unit will be installed. If you are unsure, send what you know and we will ask for the rest.
Can the unit carry our brand?
Yes. Logo, front panel, packaging and manual can be supplied under your brand. Minimum quantities and lead times are on the OEM / ODM page.
More in Industrial UPS
Five numbers get you a quote
Send what you know. We reply within one working day.
- LoadkVA or kW, and what it is
- Input voltage and phasese.g. 400 V three-phase, 50 Hz
- Output phasesSingle- or three-phase
- Backup timeMinutes at full or typical load
- SiteIndoor, temperature, altitude, generator