***OPEN BOX*** Victron Energy Autotransformer 120/240VAC-100A SN: HQ2503K4UNK
Free shipping over $49
60-day hassle-free returns
Open Box Unit
Returned to Blue Marine due to remorse. No damage to unit. No attempt at install was made. 5 Year warranty is intact. Please reach out to support@bluemarine.com if you have any questions.
Flexible Voltage Conversion • Split-Phase Balancing • Marine, RV, and Off-Grid Ready
The Victron Energy Autotransformer is a compact, high-efficiency single-phase transformer designed to give you total flexibility when configuring AC power systems. Whether you need to step voltage up or down, create a 120/240V split-phase supply, or balance uneven loads across two legs, this transformer is engineered to deliver reliable performance in demanding marine, RV, and off-grid environments.
Built around a toroidal core for low noise and high efficiency, the unit supports a wide variety of AC configurations without requiring multiple inverters or complicated rewiring. Over-temperature protection and a built-in circuit breaker provide enhanced safety and ease of installation.
Key Features
-
Step-Up / Step-Down Functionality
Convert 120V → 240V or 240V → 120V depending on your system requirements. -
Split-Phase 120/240V Capability
Generate a full split-phase output from a single-phase source — ideal for equipment that requires 240V while still supporting standard 120V loads. -
Load Balancing Across AC Legs
In split-phase systems, the autotransformer helps correct imbalance between L1 and L2, maximizing usable inverter or generator capacity. -
Neutral-to-Ground Bonding Option
Compatible with Victron inverter/chargers that require internal or system-level bonding. -
Thermal and Overload Protection
Automatic temperature-sensing shutdown and manual-reset breaker protect the system under fault conditions. -
Compact, Durable Construction
Aluminum enclosure with screw-terminal wiring simplifies installation while ensuring longevity.
Technical Specifications (Both Models):
| Specification | 32A Model | 50A Model | 100A Model |
|---|---|---|---|
| Input / Output Voltage | 120 / 240 VAC | 120 / 240 VAC | 120 / 240 VAC |
| Max Feed-Through Current | 32A | 50A | 100A |
| Neutral Current (Continuous, 40°C) | 28A | 55A/45A Continuous | 55A/45A Continuous |
| Transformer Core | Toroidal | Toroidal | Toroidal |
| Frequency | 50 / 60 Hz | 50 / 60 Hz | 50 / 60 Hz |
| Enclosure | Aluminum, IP21 | Aluminum, IP21 | Aluminum, IP21 |
| Terminal Size | Up to 35 mm² (AWG 2) | Up to 35 mm² (AWG 2) | Up to 35 mm² (AWG 2) |
| Dimensions (H × W × D) | 425 × 214 × 110 mm | 425 × 214 × 110 mm | 425 × 214 × 110 mm |
| Weight | 12.5 kg (27.6 lbs) | 12.0 kg (26.4 lbs) | 13.5 kg (29.8 lbs) |
Typical Applications
-
Creating a split-phase system from a single-phase inverter or generator
-
Balancing AC leg loads to improve inverter/generator efficiency
-
Voltage adaptation when shore power or generator output doesn’t match equipment requirements
-
Marine and RV systems encountering varying AC sources
-
Off-grid homes using mixed 120V and 240V appliances
Warranty Information
Shipping & Returns
We offer free shipping over $49. Lithium batteries & oversize items may have an applicable shipping charge.
We know returns are no fun so we aim to make the return process as hassle free as possible! We have a 60-day return policy, which means you have 60 days after receiving your item to request a return.
Lithium batteries and products with lithium batteries inside are non returnable: Due to carrier regulations surrounding the shipment of lithium batteries (classified as a fully regulated hazardous material), we are unable to accept returns unless arranged locally. We appreciate your understanding and encourage you to contact us with any questions prior to purchase.
For more information on returns, visit our return policy page.
Product Attachments
Choose options
About Blue Marine
Nationwide Shipping from Our Warehouse in Seattle
Knowledgeable technicians, firendly advice and fast shipping.