Victron Energy Filax 2 AC Transfer Switch, Under 20ms Switching Time

Overview

The Victron Energy Filax 2 is an ultra-fast AC transfer switch for keeping a sensitive AC load powered from either a priority source or an alternate source, with a maximum load transfer time of 16ms. On a boat, that makes it useful for equipment that should not drop out when AC supply changes, such as navigation support electronics, communications equipment, onboard computers, and entertainment systems.

The priority source is typically shore power, a generator, or mains AC, while the alternate source is typically an inverter. The Filax 2 uses open transition transfer, also known as break-before-make switching, and returns to the priority source after it has stayed within the voltage and frequency limits for 30 seconds.

The unit is rated for a maximum current of 16A and is housed in an IP65 ABS enclosure. It measures 120 x 255 x 75mm, weighs 0.8kg, and operates from -20°C to +50°C with non-condensing humidity up to 95%.

Key features

• Ultra-fast AC source transfer with a maximum load transfer time of 16ms for sensitive onboard loads.
• Open transition operation separates one AC source before connecting the other, which helps avoid source overlap during switching.
• Priority source input, alternate source input, and AC output terminals support a clear shore power, generator, or inverter changeover layout.
• Maximum current rating of 16A, with both inputs requiring protection against current levels higher than 16A.
• 50Hz or 60Hz operation is set by jumper, so the switching thresholds can be matched to the vessel’s AC frequency.
• IP65 ABS enclosure in RAL7035 light grey for installation in protected onboard locations where the casing may be exposed to damp air or splash risk.
• LED status indication shows whether the load is supplied by the priority source, supplied by the alternate source, or affected by a priority source fault.
• Not intended for high-power household equipment or electric motors, which keeps its role focused on sensitive and critical AC loads.

Variants

The Filax 2 is offered in two AC voltage and frequency configurations, allowing the transfer switch to match the vessel’s AC system standard.

The enclosure, maximum 16A current rating, 16ms maximum transfer time, IP65 protection category, operating temperature range, and overall dimensions remain the same across these configurations.

• SDFI0000000: AC voltage and frequency 230V/50Hz-240V/60Hz. This version fits AC installations in the 230V and 240V range, with 50Hz or 60Hz operation set by jumper during installation.
• SDFI0000110: AC voltage and frequency 110V/50Hz-120V/60Hz. This version fits AC installations in the 110V and 120V range, with 50Hz or 60Hz operation set by jumper during installation.

Installation and setup

The Filax 2 should be installed in an area that is dry and well ventilated, with the priority source, alternate source, and output connected according to the wiring layout. In a marine AC system, the priority side is commonly fed by shore power or a generator, and the alternate side by an inverter that can carry the selected sensitive load.

The frequency jumper matters during setup. A missing or incorrect jumper position can cause the voltage switching thresholds to be wrong for the system frequency, so the 50Hz or 60Hz configuration should be checked before the unit is put into service.

For connected loads below 850W, the internal wire bridges are removed as part of the installation. This step should be handled by a qualified installer familiar with marine AC wiring, overcurrent protection, and the vessel’s grounding arrangement.

Use cases on board

This transfer switch is a good match for boats that use more than one AC source and need selected low-current equipment to stay powered when the preferred supply drops outside its allowed voltage or frequency range. Common examples include a navigation station computer, network equipment, a small AV circuit, or other AC loads where a brief interruption can cause an unwanted reboot.

It is not the right device for heavy AC appliances, washing machines, or motor loads. For those circuits, the vessel’s AC distribution and transfer arrangement should be sized and selected separately.