Description
Detailed parameter table
| Parameter name | Parameter value |
| Product model | G-TUB30-480FEHSNA2 |
| Manufacturer | Elmo |
| Product category | Industrial dry-type isolation transformer |
| Rated power | 30 kVA |
| Input voltage | 480 V AC, 3-phase, 50/60 Hz |
| Output voltage | 208 V AC / 120 V AC, 3-phase, 4-wire |
| Voltage ratio | 480 V Δ / 208 Y/120 V |
| Frequency compatibility | 50 Hz / 60 Hz (dual frequency) |
| Efficiency | ≥97.5% at full load |
| Insulation class | H (180°C) |
| Protection degree | IP21 |
| Cooling method | Forced air cooling (AF) + natural convection (AN) |
| Short-circuit withstand capacity | 30 kA for 2 seconds |
| Dimensions | 420mm × 360mm × 300mm |
| Weight | 78 kg |
| Certifications | UL 1561, IEC 61558-1, CE, RoHS |
Elmo G-TUB30-480FEHSNA2
Product introduction
The G-TUB30-480FEHSNA2 is a high-performance dry-type isolation transformer from Elmo, engineered to deliver precise voltage conversion and electrical isolation in demanding industrial and commercial power systems. As a key offering in Elmo’s power distribution portfolio, this transformer is designed to step down 480 V AC three-phase input to 208 V AC / 120 V AC, making it an ideal power source for sensitive electronics, automation equipment, and mixed low-voltage loads.
What sets the G-TUB30-480FEHSNA2 apart is its advanced thermal management system and enhanced insulation, which enable reliable operation in high-temperature environments. Its isolation design creates a barrier between input and output circuits, effectively eliminating ground loops and suppressing electromagnetic interference (EMI)—critical for protecting PLCs, drives, and communication devices in noisy industrial settings. With a 30 kVA rating, compact footprint, and versatile cooling options, this transformer balances power capacity with adaptability, making it suitable for manufacturing plants, data centers, and critical infrastructure where uptime and signal integrity are paramount.
Core advantages and technical highlights
Superior thermal resilience: The G-TUB30-480FEHSNA2 features an H-class insulation system (180°C), allowing continuous operation at ambient temperatures up to 50°C without derating. Its hybrid cooling system—combining forced air (AF) and natural convection (AN)—ensures efficient heat dissipation, even during 150% overloads for 30 minutes. This makes it ideal for confined spaces like control cabinets or hot industrial environments, such as foundries or glass manufacturing facilities, where traditional transformers may struggle with heat buildup.
Enhanced isolation and EMI suppression: Equipped with a reinforced isolation barrier, the G-TUB30-480FEHSNA2 provides 2500 V AC rms isolation for 1 minute, exceeding industry standards. This design not only prevents ground loop currents but also reduces EMI by up to 50 dB, protecting sensitive equipment like Elmo’s own servo drives and PLCs from signal interference. In automation cells with high-frequency motor drives, this suppression ensures stable communication and precise control, minimizing process errors.
High efficiency and energy optimization: With a full-load efficiency of ≥97.5% and ultra-low no-load loss (≤120 W), the G-TUB30-480FEHSNA2 outperforms many standard transformers. Its efficiency remains above 96% even at 50% load, making it highly energy-efficient for variable-demand applications. In a 24/7 data center, this can translate to annual energy savings of up to 650 kWh compared to conventional units, reducing operational costs and carbon footprint.
Robust safety features: The transformer integrates multiple protective mechanisms, including built-in thermal overload relays, overcurrent protection, and flame-retardant winding materials. Its IP21 rating protects against dust and dripping water, while compliance with UL 1561 and IEC 61558-1 ensures adherence to global safety standards. These features make it suitable for installation in both industrial zones and commercial areas with strict safety requirements.
Typical application scenarios
In automotive manufacturing plants, the G-TUB30-480FEHSNA2 powers robotic workcells, supplying 208 V to servo drives and 120 V to vision systems and HMI panels. Its EMI suppression prevents electrical noise from welding robots and large motors from disrupting precision control signals, ensuring consistent weld quality and accurate part inspection. The hybrid cooling system handles the heat generated by 密集 equipment in the cell, maintaining stable performance during extended production runs.
In data center power distribution, the transformer steps down 480 V main power to 208 V for server racks and 120 V for network switches and monitoring systems. Its high efficiency reduces energy waste in the facility’s power chain, while isolation protects sensitive IT equipment from voltage transients in the mains supply. The H-class insulation and robust short-circuit withstand capacity (30 kA) enhance system reliability, minimizing the risk of downtime during electrical faults.
Elmo G-TUB30-480FEHSNA2
Related model recommendations
G-TUB20-480FEHSNA2: A 20 kVA variant of the G-TUB30-480FEHSNA2 for smaller automation cells or distributed power systems.
G-TUB50-480FEHSNA2: A 50 kVA model with enhanced cooling, ideal for scaling up systems beyond the G-TUB30-480FEHSNA2’s capacity.
Elmo Gold Twitter: A servo drive perfectly paired with the G-TUB30-480FEHSNA2 for precision motion control in automation applications.
Elmo PLC-2000: A compact PLC that integrates seamlessly with the transformer, leveraging its clean power for reliable operation.
E-Surge 30A: Elmo’s surge protection device, which safeguards the G-TUB30-480FEHSNA2’s input from mains voltage spikes.
E-Net 485: A communication module powered by the transformer, enabling noise-free data transmission in industrial networks.
Installation, commissioning and maintenance instructions
Installation preparation: Ensure the mounting surface can support 78 kg and is level. The installation area should have ambient temperatures between -10°C and 50°C, with at least 50 cm clearance for airflow. Verify the input voltage is 480 V AC 3-phase, and install a 63 A circuit breaker upstream. Use tinned copper conductors (4 AWG for input, 10 AWG for output) with crimped lugs, torqued to 22 Nm. Required tools include a torque wrench, wire strippers, and a thermal imager for post-installation checks. Power off all connected equipment during installation.
Maintenance suggestions: Inspect the G-TUB30-480FEHSNA2 monthly, checking for dust buildup on cooling fans and vents—clean with compressed air if necessary. Test fan operation quarterly to ensure forced cooling functionality. Annually, verify terminal tightness and measure insulation resistance (should exceed 100 MΩ at 500 V DC). Monitor output voltage stability monthly, ensuring it remains within ±3% of nominal values. If abnormal noise, vibration, or temperature spikes (exceeding 120°C on the case) are detected, disconnect power and contact Elmo service. Replace air filters (if equipped) every 6 months in dusty environments.
Service and guarantee commitment
The G-TUB30-480FEHSNA2 comes with a 12-year warranty from the installation date, covering manufacturing defects and ensuring compliance with performance specifications. Elmo guarantees emergency replacement within 48 hours for critical applications, minimizing downtime in power-dependent systems. Technical support is available 24/7 via Elmo’s global network of power specialists, offering assistance with load calculation, installation optimization, and troubleshooting. Extended service contracts include annual thermal imaging, insulation testing, and fan maintenance, ensuring the transformer delivers reliable performance throughout its 30-year design lifespan. Customers also gain access to Elmo’s online portal with wiring diagrams, certification documents, and application notes specific to this model.
