Victron Energy Filax-2 110V/120V Ultra-Fast AC Transfer Switch – SDFI0000110

Product Overview

The Victron Energy Filax-2 SDFI0000110 is an ultra-fast automatic AC transfer switch designed to provide a reliable power supply to sensitive electrical equipment. Rated at 16A, it automatically switches between two independent AC power sources, helping maintain power to connected equipment when the primary supply fails or moves outside its acceptable voltage or frequency range.

Designed for backup power, off-grid and marine applications, the Filax-2 is particularly suitable for computers, communication equipment, electronic controls and other sensitive devices that require a dependable AC supply.

This version is designed for 110V/50Hz and 120V/60Hz electrical systems, making it suitable for compatible North American and other lower-voltage installations.

Ultra-Fast Automatic Switching

The Filax-2 normally supplies connected equipment from the priority AC source, typically mains electricity or a generator. A second independent AC source, usually an inverter or inverter/charger, is connected as the alternative supply.

If the priority source fails or its voltage or frequency moves outside the configured operating limits, the Filax-2 automatically transfers the load to the alternative source. Its maximum transfer time is just 16 milliseconds, helping minimise interruptions to sensitive equipment.

When the priority supply returns and remains within its acceptable operating limits for 30 seconds, the unit automatically switches back to the priority source.

Designed for Sensitive Electrical Equipment

Unlike conventional transfer switches intended for general electrical loads, the Filax-2 has been developed specifically for equipment that benefits from extremely fast source switching.

Typical applications include computers, network equipment, communication systems, electronic control equipment and other sensitive electrical devices.

It is particularly useful in backup power installations where an inverter provides an alternative supply during a mains or generator failure.

The Filax-2 is not intended for high-power appliances or equipment with substantial starting-current surges, such as washing machines and electric motors.

Automatic Source Monitoring

The Filax-2 continuously monitors the priority AC source for voltage and frequency conditions. If the supply moves outside its switching thresholds, it automatically transfers the connected load to the alternate source.

The unit uses open-transition switching, also known as break-before-make operation. This prevents the two AC sources from being connected together during changeover.

A frequency selection jumper allows configuration for either 50Hz or 60Hz operation. The correct setting must be selected to match the electrical system.

LED indicators provide visual information about the selected power source and the operating status of the transfer switch.

Technical Specifications

The Victron Energy Filax-2 SDFI0000110 is designed for 110V AC at 50Hz and 120V AC at 60Hz. It has a maximum continuous current rating of 16A and a maximum load transfer time of 16 milliseconds.

The priority-source low-voltage switching threshold is 90V AC, with reverse switching at 100V AC. The low-frequency switching threshold is 45Hz at 50Hz operation, with reverse switching at 47Hz. At 60Hz operation, the corresponding frequency thresholds are 55Hz and 57Hz.

The maximum continuous input voltage for both the priority and alternate sources is 140V AC. The automatic return delay is 30 seconds once the priority supply has stabilised within the required operating limits.

The operating temperature range is -20°C to +50°C, with maximum non-condensing humidity of 95%.

The enclosure is manufactured from ABS plastic, finished in light grey (RAL7035), and has an IP65 ingress protection rating. Dimensions are approximately 120mm high, 255mm wide and 75mm deep, with a weight of approximately 0.8kg.

Installation and Compatibility

The Filax-2 has dedicated connections for the priority AC input, alternate AC input and switched output. Each connection includes live, neutral and protective earth terminals.

Both AC inputs must be appropriately protected against currents exceeding 16A, and suitable external residual-current protection must be incorporated into the installation. Correct wiring, source configuration and frequency selection are essential for safe and reliable operation.

The unit should be installed in accordance with Victron's instructions by a suitably qualified electrical installer. It must be used with compatible 110V or 120V AC sources and must not be confused with the separate 230V/240V Filax-2 model.

Product Summary

The Victron Energy Filax-2 SDFI0000110 is a compact, high-speed automatic AC transfer switch designed to maintain power continuity for sensitive electrical equipment. With its 16A rating, 16-millisecond transfer time, automatic source monitoring and IP65 enclosure, it provides a dependable solution for professional backup power, off-grid and marine installations using 110V or 120V AC systems.