Buy switches for solar systems and automated systems

In this category, you'll find switches that automatically respond to ambient light or the status of your power supply. These include twilight switches for 12V, 24V, and 230V systems, as well as transfer switches for switching between grid and off-grid operation.

Twilight Switches for Automatic Lighting Control

A twilight switch automatically turns on a connected load—such as lamps or a motor—at dusk and turns it off again at dawn. The KEMO 12V/DC twilight switch is particularly well-suited for weekend homes powered solely by a battery. For a wider voltage range, the KEMO 12-28V/DC twilight switch is available. If your system runs on the 230V grid, however, the KEMO 240V/AC twilight switch is the right choice—it automatically switches on lamps or other loads via a built-in relay.

Transfer Switches for Grid-Connected and Off-Grid Operation

The Growatt ATS-T transfer switch controls the switching of the power source in a 3-phase configuration, both when connected to the utility grid and in off-grid operation. For single-phase systems, you’ll find the appropriate Growatt ATS-S transfer switch in our relays category.

• What is a twilight switch and how does it work?

  A twilight switch uses a light sensor to measure ambient brightness and automatically turns on a connected load as soon as it gets dark, and turns it off again as soon as it gets light.

• What voltage does my twilight switch require—12V, 24V, or 230V?

  That depends on your power source: The 12V or 12–28V versions are suitable for battery-only systems, while the 240V/AC twilight switch is designed for use with the household power grid.

• What are the everyday uses for a twilight switch?

  Common applications include garden lighting, outdoor lights at weekend homes, or automatic lighting in off-grid applications where no one wants to switch the lights on or off manually.

• What is an automatic transfer switch (ATS), and when do I need one?

  An automatic transfer switch (ATS) automatically switches between two power sources, such as between grid connection and off-grid operation. It is useful wherever an uninterrupted power supply is important.

• What is the difference between a single-phase and a three-phase automatic transfer switch?

  A single-phase transfer switch is sufficient for standard residential connections; a three-phase transfer switch is required for three-phase connections, such as those found in larger residential systems or commercial settings.

• How do I connect a twilight switch?

  Depending on the model, wiring is done between the power source, the sensor, and the load. For models that require a mains connection, we recommend having the installation performed by a licensed electrician.

• What should I keep in mind when installing outdoors?

  Ensure the light sensor is installed in a weather-protected location, that the cable routing is strain-relieved, and—depending on the model—that there is adequate protection against moisture.