With the Sirius 3RA6 compact starter, Siemens Industry Automation (IA) has added to its portfolio a new low-voltage switchgear product for three-phase AC standard motors up to 32 amps. The functions of overload relay, circuit breaker, and contactor are bundled in the device. This reduces installation and wiring overhead for the user and creates more space in the control cabinet. The new compact starter has its own connection system for power supply as well as a mounting module for simple connection to AS-Interface.
A notable feature is the significant reduction in load-feeder variances
Five current ranges up to 32 amps and voltage ranges of 24 V, 42-70 V and 110-240 V, ensure the devices, available as direct or reversing starters, cover a large percentage of the application range.
The associated control kit allows users to perform functional checks on the wiring and motor direction prior to plant start-up. This can prevent faults and increase plant availability, as can safe shutdown at the end of service life, separate indication of overload and short-circuit, and auto reset following overload trip. Removable spring-loaded and screw-type terminals also simplify device replacement for service purposes.
For efficient energy supply to the main circuit, the user can simply plug the Sirius 3RA6 starter into the associated, pre-wired infeed system and thus significantly reduce the wiring overhead. This infeed system can be flexibly expanded to suit the plant by adding additional slots and Sirius industrial controls components such as 3RV1 circuit breakers or the 3RV19 infeed system. As an option PE terminals are also available for this system. This provides the possibility of directly connecting the motor cables to the Sirius infeed system for 3RA6.
To further reduce the overhead involved in integration into the control circuit, AS-I modules are available for direct connection to an AS-Interface. All the diagnostic and status data can then be forwarded direct to the higher-level controller.
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