| Capacity Range | 1kVA – 100kVA+ (Single/Three Phase) |
| Technology | True Online Double Conversion (VFI) |
| Efficiency (Online) | Up to 94% |
| Transfer Time | Zero (0 ms) |
| Input Power Factor | >0.99 |
| Isolation | Galvanic Isolation Transformer |
Industrial-grade power protection for mission-critical environments
Zero transfer time with continuous AC-DC-AC conversion, ensuring pure sine wave output for sensitive equipment.
Advanced digital signal processor with IGBT inverter for high efficiency and precise voltage regulation.
Built-in isolation transformer protects against surges, common-mode noise, and electrical faults.
High overload capacity (150% for 30s) ideal for motor loads, medical equipment, and data centers.
A Low Frequency Online UPS is a true double-conversion uninterruptible power supply designed for industrial, commercial, and mission-critical applications. Unlike offline or line-interactive systems, the online UPS continuously converts incoming AC power to DC and then back to pure sine wave AC, providing complete isolation from grid disturbances. This zero-transfer-time design ensures that connected loads receive flawless power even during blackouts, sags, surges, or frequency variations.
Built around a robust isolation transformer, the Low Frequency Online UPS delivers exceptional inrush current handling, making it ideal for inductive loads like motors, compressors, lifts, and medical imaging equipment. The transformer-based topology offers superior surge protection, electrical isolation, and long-term reliability in harsh environments.
INDUS Low Frequency Online UPS systems are engineered with DSP-controlled IGBT technology, delivering high efficiency, low harmonic distortion (THD <3%), and advanced battery management. Available in single-phase and three-phase configurations (1kVA to 100kVA+), these units provide scalable backup with extended runtime options. Features include LCD touch display, intelligent battery charging, manual/auto bypass, SNMP communication, and comprehensive protections against overload, short circuit, over temperature, and deep discharge. Ideal for data centers, hospitals, telecom towers, industrial automation, and critical infrastructure.
| Parameter | Detailed Specification |
|---|---|
| Technology | True Online Double Conversion (VFI – Voltage and Frequency Independent) |
| Capacity Range | 1kVA / 3kVA / 5kVA / 10kVA / 20kVA / 30kVA / 60kVA / 100kVA+ (Customizable) |
| Phase | Single Phase Input / Single Phase Output & Three Phase Input / Three Phase Output |
| Nominal Voltage | 230V AC (Single) / 415V AC (Three Phase) ± 25% |
| Output Voltage (Stable) | 230V/415V ± 1% (Pure Sine Wave) |
| Frequency (Mains/Inverter) | 50Hz ± 5% (Mains) / 50Hz ± 0.1% (Inverter) |
| Transfer Time | Zero (0 ms) – seamless switching |
| Overall Efficiency | Up to 94% (Online mode), >98% in ECO mode |
| Inverter Topology | IGBT with PWM control |
| Waveform | Pure Sine Wave (THD < 3% for linear load) |
| Crest Factor | 3:1 |
| Overload Capacity | 150% for 30 seconds, 125% for 10 minutes |
| Isolation | Built-in galvanic isolation transformer (Input/Output) |
| Battery Type | SMF / VRLA / Tubular / Li-ion (External battery banks) |
| DC Voltage (Nominal) | 48V / 96V / 120V / 240V / 480V (depending on capacity) |
| Protections | Overload, Short Circuit, Over/Under Voltage, Over Temperature, Battery Deep Discharge, Reverse Polarity |
| Display & Alarms | LCD/LED display with real-time parameters, audible alarms for battery low, overload, fault |
| Communication | RS232, USB, SNMP (optional), dry contacts, EPO (Emergency Power Off) |
| Operating Temperature | 0°C to 50°C |
| Optional Features | Manual/Auto Bypass, Parallel Redundancy, Isolation Transformer, SNMP Card, Extended Runtime |
*Specifications can be customized. Contact INDUS for detailed project-specific datasheet.