Motor Starter

Siemens has added the compact Sirius 3RM1 motor starter to its switching technology portfolio. The module has been designed as both a direct-on-line starter and a reversing starter with integrated overload protection for smaller motors with a rating of up to 3 kW, used, for example, for fans, pumps and lifting gear as well as in machine tools. At 22.5 mm wide, the product requires very little space in the control cabinet. Besides its narrow profile, the motor starter is also characterized by economical hybrid technology that combines the benefits of semiconductor and relay systems in one device: the low-wear semiconductor components are responsible for connection and disconnection operations while an energy-efficient relay system is used during operation. The supplier also offers a special infeed system for the new motor starter which permits fast and simple implementation of assemblies. As the main circuit is centrally connected to the infeed system, there is no need for separate wiring of the individual motor starters. The assembly with the infeed system is particularly suitable for conveyor systems in which a large number of motors are used on one conveyor belt. When maintenance is required, the individual motor starters from an existing assembly can be removed from the group with little effort thanks to the infeed system. Moreover, the motor starters can also be simply slotted in in the main circuit using a device connector, so there is no need for extensive manual power supply wiring between the motor starters in the assembly. Wiring errors cannot therefore occur and commissioning of the motor starters is speeded up.