Mastervolt Mass GI 7.0kW Isolation Transformer

The Mass GI 7.0kW provides complete galvanic isolation between the shore power supply and the boat's AC system. This isolation is essential to prevent galvanic corrosion that attacks metallic parts of the hull (propellers, shafts, through-hulls) when the boat is connected to the shore grounding.

Unlike traditional toroidal transformers, which are heavy and bulky, high-frequency switching technology enables an extremely compact and lightweight device. The Mass GI 7.0kW weighs only 10 kg while delivering an impressive 7000 VA.

This isolation transformer is designed to fit easily into tight spaces. It weighs 10 kg and its overall dimensions are approximately 340 x 261 x 250 mm.

No, the Mass GI 7.0kW does not convert voltage or frequency. The output voltage and frequency will match the input (within a ± 5% voltage tolerance). It functions solely as a galvanic isolator.

Yes, absolutely. The device accepts a very wide input voltage range from 90 to 255 V and a frequency of 45 to 65 Hz. It is therefore fully compatible with North American networks (110V/60Hz) as well as with European networks (230V/50Hz).

Energy efficiency is one of the strong points of this model. Its no-load consumption (when no device is drawing power from the bus) is extremely low, at just 44 W.

The Mass GI 7.0kW is equipped with multiple electronic protections to ensure onboard safety:

Overload protectionPeak current limitationShort-circuit protectionThermal protection (automatic shutdown if the heatsink reaches 90°C)

For the Mass GI 7.0kW model, handling an AC current up to 32A, it is recommended to use AC cables with a minimum cross-section of 10 mm² (AWG 8) to ensure a safe and loss-free installation.

Yes, this is recommended and mandatory under marine electrical standards. You must install a dedicated double-pole circuit breaker and a 30mA residual current circuit breaker (GFCI/RCD) paired with a 32A fuse at both the input and output of the device.

The Mass GI 7.0kW has native connectivity to the MasterBus network (based on the CAN protocol). By connecting it, you can monitor load, configure the device, and read any alarms directly from compatible displays on your dashboard.

No, the transformer's ability to power the MasterBus network is only active when shore power is present and the device is powered on.

This light indicates overheating of the device (ambient or internal temperature too high). You must reduce the boat's electrical consumption, allow the transformer to cool down, then reset it using the Standby/On button or via the MasterBus interface.

The unit supports ambient temperatures up to 40°C, allowing installation in a technical compartment. However, it must never be installed in an area with risk of gas or flammable dust explosions. Adequate ventilation remains essential.

The IP23 rating certifies that the housing is protected against solid objects larger than 12.5 mm (such as fingers) and against water spray at angles up to 60 degrees. It must therefore be installed inside the boat, away from direct water splashes.

For absolute safety and compliance with standards, the protective earth (located on the transformer's output terminal) must be connected to the vessel's central grounding point on the hull.

If the charge LED turns red at 100%, this indicates an imminent overload (demand exceeding the 32A nominal rating). The device will soon shut off for safety. Immediately turn off high-consumption equipment aboard.

Absolutely. With a continuous capacity of 32A (7000 VA), this model is specifically designed for large vessels requiring high power demand (air conditioning, watermaker, high-capacity battery chargers).

No, the device is supplied alone with its integrated cable glands for cable entry. AC cables are not provided as their length and type depend specifically on your boat's configuration and installation.

The transformer’s front panel is fitted with a row of LED indicators. These lights illuminate progressively (from 5% to 100%) to visually show the current load being drawn from the dock relative to the device’s rated capacity.

Yes, the Mass GI 7.0kW is designed for demanding environments. Its operating temperature range is from -20°C to 60°C. It can even be stored undamaged at temperatures down to -40°C.