Motion & Motors & Drives Siemens

Siemens expands Sirius portfolio with particularly compact motor starter

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The Siemens Industry Automation Division has added the particularly compact Sirius 3RM1 motorstarter to its switching technology portfolio. The module has been designed as both a direct-on-linestarter and a reversing starter with integrated overload protection for smaller motors with a rating ofup to 3 kW, used, for example, for fans, pumps and lifting gear as well as in machine tools. At just22.5 mm wide, the Sirius 3RM1 requires very little space in the control cabinet. The motor startertherefore meets the requirement in modern plant and machinery construction for space-savingcomponents.

Besides its narrow profile, the Sirius 3RM1 is also characterized by economical hybrid technologythat combines the benefits of semiconductor and relay systems in one device: the low-wearsemiconductor components are responsible for connection and disconnection operations while anenergy-efficient relay system is used during operation. This extends the motor starter’s service lifeand reduces maintenance demands. Siemens also offers a special infeed system for the newmotor starter which permits fast and simple implementation of assemblies. As the main circuit iscentrally connected to the infeed system, there is no need for separate wiring of the individualmotor starters.

The assembly with the infeed system is particularly suitable for conveyor systems inwhich a large number of motors are used on one conveyor belt. When maintenance is required, theindividual motor starters from an existing assembly can be removed from the group with little effortthanks to the infeed system. Moreover, the motor starters can also be simply slotted in in the maincircuit using a device connector, so there is no need for extensive manual power supply wiringbetween the motor starters in the assembly. Wiring errors cannot therefore occur andcommissioning of the motor starters is speeded up.


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