Best 480V to 120V Transformers for Industrial Power Conversion
When selecting a transformer to step down from 480V to 120V, it’s essential to match the application needs with a reliable unit that offers appropriate VA rating, mounting options, and compliance features. This guide highlights five top-rated transformers that handle 480V inputs and provide 120V outputs, covering industrial controls, lighting, and equipment power supplies. Each option combines robust construction with practical installation choices to support commercial and industrial environments.
| Product | Output | VA Rating | Input Voltage | Mounting / Features |
|---|---|---|---|---|
| Functional Devices TR50VA008 Transformer | 120 VAC | 50 VA | 480/277/240/208 VAC | Foot and dual threaded hub mount; includes circuit breaker |
| Functional Devices TR150VA008 Transformer | 120 VAC | 150 VA | 480/277/240/208 VAC | Foot and dual threaded hub mount; circuit breaker |
| Functional Devices 100VA Control Transformer | 120 VAC | 100 VA | 208/240/277/480 VAC | Foot or dual 1/2″ NPT hub mounting; leads connections |
| Acme Electric Transformer, 3 kVA | 208/120 VAC | 3,000 VA | 480 VAC | Wall mounting; NEMA 3R enclosure; steel body |
| ELCO Lighting ETR-277 Transformer | 120 VAC | 250 VA | 277 VAC | Versatile input; compact step-down for low-voltage lighting |
Note: The table above highlights a mix of units suitable for stepping down from 480V to 120V, including models that also accept 277V or 240V inputs. Review each unit’s exact input range and mounting requirements to ensure compatibility with your installation.
Functional Devices TR50VA008 Transformer
The TR50VA008 is designed for multi-voltage input (including 480, 277, 240, and 208 VAC) with a 120 VAC output. It ships with a circuit breaker and offers a compact footprint suitable for control panels and electrical enclosures. Mounting is flexible via foot or dual threaded hub. The unit’s package weight and dimensions indicate a durable, installer-friendly option for medium-load applications in industrial settings. Key considerations include confirming output demand aligns with the 50 VA rating and ensuring the enclosure accommodates the mounting method.
Functional Devices 100VA Control Transformer
This 100 VA control transformer accepts 208/240/277/480 VAC inputs and delivers 120 VAC. It features 1-phase operation and offers a compact form suitable for control panels or compact enclosures. Mounting is possible via foot or dual 1/2″ NPT hub. The unit’s led indicators and protective devices are useful for routine maintenance and quick troubleshooting in industrial environments. Consider the required load and the enclosure space to determine if 100 VA adequately supports your load.
Functional Devices TR150VA008 Transformer
The TR150VA008 delivers 150 VA at 120 VAC from high-voltage inputs of 480/277/240/208 VAC. It includes a circuit breaker and dual mounting options (foot and threaded hubs) to simplify panel design. The 150 VA rating supports larger control circuits and lighting loads, making it suitable for mid-sized electrical assemblies. Ensure the wiring lead length and enclosure clearance meet safety standards for high-voltage installations.
Acme Electric 3 kVA Transformer
This 3 kVA transformer is designed for 480 VAC input with outputs of 208 VAC and 120 VAC. It features a NEMA 3R enclosure suitable for indoor/outdoor use and a steel enclosure with powder polyurethane paint finish. The unit is intended for larger power conversion needs such as industrial lighting, heating elements, or equipment feeds. It is mounted on a wall and provides robust protection for outdoor or semi-outdoor environments. Check mounting dimensions and input/output clearances when integrating into existing systems.
ELCO Lighting ETR-277 Magnetic Transformer
The ETR-277 model is a magnetic transformer designed for 277V inputs with a 120V output, offering versatile compatibility for low-voltage lighting installations. It provides a compact solution for stepping down from 277V to 120V, commonly used in certain lighting circuits and fixtures. When planning use, verify the available space around the transformer and ensure the 277V supply is consistent with the fixture requirements. Although it does not handle 480V directly, it remains a relevant option in systems where 277V is the available high side input.
Buying Guide
- Voltage compatibility: Confirm that the input voltage matches your supply (480/277/240/208 VAC) and that the output is 120 VAC as required by your loads.
- VA rating: Match the transformer’s VA rating to the total load. Oversizing provides headroom, while undersizing can lead to overheating or insufficient voltage under load.
- Mounting and enclosure: Choose a mounting style (foot, hub, wall) aligned with your panel and space constraints. Consider enclosure ratings (IP/NEMA) for environmental exposure.
- Protection features: Look for built-in circuit breakers or fusing options to enhance safety and protect downstream equipment.
- Efficiency and regulation: Check for energy efficiency characteristics and any applicable UL/CSA standards to ensure compliance with local codes.
- Maintenance and serviceability: Prefer transformers with accessible terminals and clear labeling for easy maintenance and troubleshooting.
- Future expansion: If planning load growth, select a transformer with additional VA capacity or modular mounting provisions.