Semiconductor Switching Devices suit 3-phase applications.

Press Release Summary:

Designed specifically for ac applications, semiconductor switching devices have width of 45 mm, and can be used in current range up to 55 A. Contactors are available in 5 versions covering current range from 0-50 A in 10 A steps. With 4-30 V control voltage range, units can be used with both digital and temperature controllers. Devices are available with screw and spring-loaded or ring terminal end connections, and as 2- and 3-phase controlled versions.

Original Press Release:

Semiconductor Switching Devices Now Also for Three-Phase Applications

Siemens Automation and Drives (A&D) has developed three-phase semiconductor switching devices specially for AC applications. The new semiconductor relays and contactors supplement the Sirius range of single-phase semiconductor switching devices.

The devices are used for three-phase circuits, require little space, and are easy to install. With their small overall width of only 45 mm, the semiconductor relays can be used in a current range up to 55 A depending on the heat sink used. The semiconductor contactors are available in five versions which cover a current range from 0 to 50 A in 10-A steps. A wide range of applications is covered by the large voltage range from 48 to 600 V. The control voltage range of the relays and contactors is between 4 and 30 V, meaning that the devices can be used with digital controllers as well as with simple temperature controllers.

The new semiconductor switching devices are available as two-phase and three-phase controlled versions. The three-phase controlled devices are used where all three phases have to be switched during operation. If a two-phase control is sufficient for the application, this helps save power, space and costs.

As was already the case with the single-phase predecessors, Siemens offers the three-phase semiconductor switching devices with screw, spring-loaded or ring terminal end connections. The removable control connector allows prewiring of the control circuit. A converter for percentage control of the power can be simply snapped onto the devices, and thus controls the complete three-phase load.

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