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Why a SIRIUS 3RF5 DC solid-state relay?

DC grids are becoming increasingly important in numerous application areas. They enable more efficient power distribution by eliminating the need for multiple AC/DC conversions and reducing energy losses. At the same time, they make it easier to integrate renewables, battery storage systems, and modern DC loads. This also places greater demands on switching devices, which must reliably handle high switching frequencies while remaining efficient and durable.

The innovative SIRIUS 3RF5 DC solid-state relay devices have been specifically developed for DC applications requiring more than 1,000 switching operations per hour. They are available as a DC solid-state relay for mounting on a heat sink or as a solid-state DC contactor with an integrated heat sink. Thanks to very low power losses, less heat is generated, reducing cooling requirements and extending service life. This helps lower operating costs and increase system availability.

Key benefits

Benefit from high reliability and a long service life

Benefit from long-term reliability and outstanding durability for more than 1,000 switching operations per hour thanks to robust semiconductor-based DC switching technology with no mechanical wear parts.

Save valuable space in your control panel

Lay the foundation for more compact control cabinet designs with higher packing density and smaller heat sinks – thanks to minimized power losses and heat generation, as well as a space-saving width of just 22.5 mm.

Simplify your planning process

Reduce complexity in planning, procurement, and inventory management – thanks to a streamlined portfolio with two variants: the DC solid-state relay for existing heat sinks and the ready-to-use solid-state DC contactor.

Featured capabilities

Two women in an office and lab. A crossed-out speaker indicates silent operation of SIRIUS 3RF5 solid-state switching devices

Eliminate noise in sensitive environments

Use silent switching: Thanks to its fully electronic solid-state technology, the SIRIUS 3RF5 DC solid-state relay is ideal for noise-sensitive environments such as elevators, offices, hospitals, laboratories etc.

Tablet with thermometer, scale and factory illustrates temperature control with SIRIUS 3RF5 solid-state switching devices.

Enable precise temperature control

Enable precise temperature control, e.g. in electric heating applications. The finer the control needs to be, the higher the switching frequency – ideal for the high switching endurance of the SIRIUS 3RF5 DC solid-state relay.

A direct current and a tachometer icon indicate the high performance of the SIRIUS 3RF5 semiconductor switching devices.

Choose high-performance DC switching technology

Benefit from a powerful switching solution for DC applications: SIRIUS 3RF5 DC solid-state relays & contactors are designed for use at very high line voltages, while minimizing power loss thanks to their semiconductor technology.

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Car manufacturing

Higher availability for adhesive systems in the automotive industry

In automated vehicle assembly adhesive systems, heating circuits must reliably maintain the hot-melt adhesive at the required temperature – from approx. 30 °C at the drum pump to up to 85 °C at the robot applicator head. When transitioning to DC grids, the SIRIUS 3RF5 DC solid-state relay and solid-state DC contactor enable precise, low-wear control of the heating system. This increases system availability, reduces the risk of downtime, and improves energy efficiency thanks to low power losses.

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