The Marine-Puck MP6 25A is a 6 kVA toroidal marine isolation transformer designed for safe, reliable shore power on boats and yachts. It features a hermetically epoxy-encapsulated toroidal transformer inside a rugged, flame-rated non-metallic ABS plastic enclosure. This Class II double-insulated construction provides complete galvanic isolation with no ground reference to the enclosure or boat ground.
Soft Start and Boost included with every unit.
Because the enclosure is non-metallic, it cannot be grounded and delivers superior corrosion resistance compared to most stainless-steel alloys in harsh marine environments. The solid epoxy potting compound locks all internal connections in place, eliminating vibration-induced loosening, shorts, or arcing while preventing seawater ingress. The result is a compact, lightweight, and virtually maintenance-free isolation transformer that protects vessels from galvanic corrosion, stray currents, and electrical hazards far more effectively than traditional designs.
Key Benefits
- Stops nuisance GFI tripping on shore power
- Eliminates galvanic corrosion of metal hulls, shafts, and propellers
- Provides true Class II double insulation (no ground reference)
- Hermetically sealed epoxy potting prevents seawater ingress
- Non-metallic ABS enclosure offers superior corrosion resistance
- Quiet toroidal design – no annoying hum
- Up to 50% lighter and smaller than conventional laminated transformers
- Soft-start included
- 104 V and 208 V boost included
- UL Listed Marine (E509703) and Ignition Protected
Technical Specifications
| Specification | MP6 25A |
|---|---|
| Continuous Power | 6 kVA |
| Frequency | 50/60 Hz (International) |
| Input Voltage | 120/240 V |
| Output Voltage | 120/240 V |
| Dimensions | OD 12.6″ × Height 6.5″ |
| Weight | 80 lb |
| Enclosure | Flame-rated non-metallic ABS |
| Insulation | Class II (double-insulated) |
| Potting | Solid epoxy resin, hermetically sealed |
| Voltage Boost | 104 V & 208 V included |
| Soft-Start | Included |
| Leads | AWG #10 CU, color-coded |
| Mounting | Central carriage bolt — deck or bulkhead |
| Certifications | UL Listed E509703, Ignition Protected |
| Origin | Made in USA |
Electrical Notes
All Marine-Puck units include 104 V and 208 V boost taps and soft-start. The MP6 is typically wired for 120/240 V service. Full boost and no-boost wiring diagrams are supplied with every unit.
Installation Schematics: MarinePuck_Brochure
Green ground lead is not used (capped off) – consistent with true Class II isolation.
| Shore Power | Boat’s Electrical Panel | Electrical Schematics | |
|---|---|---|---|
| Single MP | Dual MP | ||
| 120V 30A (3 wires) | 120V | 120V/120V | NA |
| 120V/240V | 120V/240V | NA | |
| 240V 50A (4 wires) | 120V | S240V/120V | NA |
| 120V/240V | S240V/240V | D240V/240V | |
Mounting
The Marine-Puck mounts on top of or below a deck or bulkhead using a single central carriage bolt with flat washer, split lock washer, and hex nut. Input and output wiring may exit from the rear through the mounting surface or radially through the lower rim in any orientation.
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