Best Single-Phase 208 to 240 Transformers for Industrial and Electrical Projects
If you need a reliable single-phase transformer to convert 208V to 240V (or vice versa) for lighting, controls, or equipment, this guide highlights practical options and buying tips. These models are best for small-to-midrange loads, workshops, or temporary installations where stable voltage levels are crucial. The selections favor units with clear voltage options, available amperage choices, and straightforward safety notes to help you choose confidently.
| Product | Primary-Secondary Voltage | Secondary Amps (typical) | Best For |
|---|---|---|---|
| 1-Phase Buck/Boost Step-Up Transformer – 208V to 240V | 208V → 240V | 23.4A, 40A, 70A options | Light to moderate loads; general purpose control circuits |
| 1 Phase Buck and Boost Step-Up Transformer – 208V to 240V | 208V → 240V | 30A, 31.2A, 46.8A, 62.5A, 93.7A, or 456A options | Customizable load ranges; equipment with varying current needs |
| 1 Phase Buck and Boost Step-Down Transformer – 240V to 208V | 240V → 208V | 26.6A, 35.4A, 60A | Industrial controls; devices needing 208V from a 240V source |
| 1-Phase Buck and Boost Transformer – 208V to 230V | 208V → 230V | 62.5A, 130A, or 208.33A | Higher current requirements; machinery with 230V rating |
| 1-Phase Buck/Boost Step-Up Transformer – 208V to 230V | 208V → 230V | 18.6A, 20.8A, 31.25A, or 41.67A | Compact, moderate loads; space-constrained installations |
1-Phase Buck/Boost Step-Up Transformer — 208V to 240V, 23.4A/40A/70A
- Brand: Larson Electronics
- Primary: 208V, Secondary: 240V
- Amps: up to 23.4A (also offered in 40A and 70A variants)
- Notes: For safety, returns on transformers are not accepted; units are destroyed if unsafely handled after factory sale.
Best for: small to mid-sized electrical loads where a stable 240V output is needed from a 208V supply. Choose this if your application operates near 23.4A and you want a straightforward 208V-to-240V conversion.
Caution: Limited return options due to safety policy; verify exact amperage requirement before purchase.
1 Phase Buck and Boost Step-Up Transformer — 208V to 240V (30–456A)
- Brand: Larson Electronics
- Voltage: 208V to 240V; amperage options range from 30A to 456A
- Notes: Custom options available; safety policy applies to transformers.
Best for: facilities needing scalable amperage options for varying loads; ideal when future expansion is anticipated. Consider this when your equipment current draw may exceed standard small-unit limits.
Caution: Custom options may require longer lead times and confirmation of duty cycle.
1 Phase Buck and Boost Transformer — 240V Primary to 208V
- Brand: Larson Electronics
- Primary: 240V, Secondary: 208V
- Amps: 26.6A, 35.4A, 60A
- Notes: Custom options available; safety and destruction policy applies to post-factory units.
Best for: scenarios where equipment operates at 208V but is powered from a 240V system. Build: choose the amperage matching your load to minimize voltage drop.
Caution: Verify that your devices tolerate slight voltage differences after step-down.
1-Phase Buck/Boost Step-Up Transformer — 208V to 230V
- Brand: Larson Electronics
- Voltage: 208V to 230V
- Amps: 18.6A, 20.8A, 31.25A, 41.67A
- Notes: Safety policy applies; custom options available for specific needs.
Best for: compact projects with moderate current needs wanting a 230V output from 208V input. Ideal for space-constrained installations where a smaller transformer suffices.
Caution: Check device voltage tolerance around 230V after boost.
1-Phase Buck/Boost Step-Down Transformer — 240V to 208V
- Brand: Larson Electronics
- Voltage: 240V to 208V
- Amps: 26.6A, 35.4A, 60A
- Notes: Safety policy applies; consider electrical code requirements for 208V equipment from a 240V supply.
Best for: feeding 208V-rated equipment from a higher 240V supply, common in industrial control panels. Choose amperage to match the connected load.
Caution: Ensure electrical configuration supports 208V devices without exceeding circuit capacity.
3 Phase Buck and Boost Transformer — 208V to 240V
- Brand: Larson Electronics
- Voltage: 208V to 240V (three-phase)
- Amps: 31.3A, 46.9A, 62.5A
- Notes: Custom options available; safety policy applies to transformer purchases.
Best for: applications that require three-phase transformation coordinated with single-phase systems; use when a three-phase solution better matches equipment layout.
Caution: If your system is strictly single-phase, consider single-phase models to reduce complexity and wiring requirements.
TR50VA008 Transformer — 480/277/240/208V to 120V, 50VA
- Brand: GUSUUI
- Voltage: 480/277/240/208V to 120V
- Power: 50VA; Features a circuit breaker and dual threaded hub mount
- Notes: Suitable for industrial, heating, and AC control applications
Best for: small control circuits and thermostats in industrial settings needing 120V output from multiple input voltages. The integrated circuit breaker adds protection for connected devices.
Caution: Rated at 50VA; ensure the load does not exceed this rating to avoid overheating.
Buying Guide: How to Choose the Right Single-Phase 208V to 240V Transformer
- What load will the transformer serve? Match the secondary voltage and ampacity to the equipment’s voltage and current needs to avoid overheating or voltage drop.
- How will input voltage vary? If your source is strictly 208V, choose a model that efficiently steps up to 230–240V or a model designed for 208V operation.
- U.S. electrical codes and safety. Confirm accessibility to proper enclosure, mounting, and protective devices; note that some sellers indicate no returns for transformers for safety reasons.
- Space and installation. Consider footprint, mounting options, and whether a compact transformer is adequate for your project.
- Custom options. If your load profile changes, discuss custom amperage or voltage configurations with the supplier prior to purchase.
FAQ
- What does “208V to 240V” mean for a transformer?
It means the device can take a 208V input and provide a 240V output, or vice versa, depending on the model and wiring configuration. - When should I use a buck vs. a boost transformer?
Use a buck transformer to step voltage down and a boost transformer to step voltage up; choose based on your equipment’s required input voltage. - Are these transformers safe for continuous operation?
They are designed for regular electrical use, but always confirm current ratings and ensure proper enclosure, ventilation, and protection against shorts. - Can I use a three-phase transformer in a single-phase system?
Some models are designed for three-phase applications; for single-phase systems, pick a single-phase transformer to simplify wiring and protection. - Do these units come with warranties?
Warranty terms vary by seller; review the product listing and policy for specifics on coverage and returnability.