Dock Boost Transformer

The smart isolation boosting transformer

  • Drop-in replacement for the Charles Iso-boost

  • 3 boosting levels utilizing smart tap system

  • Lightweight and compact at 127lbs

  • Industry recognized mounting pattern

  • Wide input range of 167-270 VAC

  • Parallelable for advanced applications

The perfect replacement for the Charles Iso-Boost™

The Charles Iso-Boost™ was arguably the most popular boosting transformer in the marine industry. In late 2016, Charles refocused on telecommunications and enclosures and discontinued the Iso-Boost™. As distributors’ supplies of the legacy product dwindled, few alternatives matched or surpassed the isolation transformer boat builders and end users alike had grown to know and love.
​​With a sizeable market hungry for a proper replacement, ASEA Power Systems set to work engineering a smart isolation transformer; their efforts resulted in the original Dock Boost Transformer (DBT12). In early 2018, ASEA launched the product to be measured up against it’s beloved predecessor.
​​The first generation DBT surpassed the Charles Iso-Boost™ with flying colors; a wider input voltage range, smaller footprint, tighter voltage regulation and 46% weight decrease has made the unit not only the perfect replacement, but an undeniable upgrade. The product has been installed in retrofits and new builds across the Americas yielding an overwhelmingly positive response.​
ASEA collected and reviewed voice of customer feedback to develop an expansion plan for the Dock Boost Transformer family. The extended line includes DBTs with paralleling capability, increased power levels, and compatibility with international power standards.Along with paralleling capability, new features include a CPU board with enhanced capabilities for communications and monitoring, auto-restart after latching, data capture of shutdown events to aid troubleshooting, and an increased programmed trip limit to allow for the start of heavy duty loads such as AC units.




Input Current 50 amps continuous 50 amps continuous
Input Voltage 167-270 VAC wider 167-255 VAC
Output Voltage 207-264 VAC 192-255 VAC
Power Level 12 kVA 12 kVA
Boosting Levels 3 taps smarter 1 tap
Frequency 50*/60 Hz 50/60 Hz
Dimensions 30 x 33 x 47 cm / 12 x 13 x 19 in smaller 30 x 38 x 45 cm / 12 x 15 x 18 in
Weight 58 kg / 127 lb lighter 107 kg / 235 lb

* 50 Hz available only in DBT15

* 50 Hz available only in DBT15 


The Dock Boost Transformer (DBT) provides precision voltage regulation to the vessel, delivering complete protection from the most common shore power problems, including: brownouts, spikes, sags, and low-line or high-line voltage conditions from the dock power pedestal. The DBT also provides three levels of boost to keep your ship powered even when input voltages sag by 35%.

The DBT features a compact and lightweight footprint. By providing an industry recognized mounting pattern, it will fit as the perfect replacement for new construction or retrofit applications (direct replacement for the Charles Iso-Boost).

The DBT12/15 accepts any input voltage ranging from 167 V-270 V (47-70 Hz) and provides a Split phase 120/240V or 115/230 V output nominal. The DBT24 accepts nominal voltages of 230, 400V and 480V - each with the same wide range – to provide a 115/230V Split phase output.

Select options to choose model

Out of stock