New contactors, overload relays developed by Siemens

Siemens Energy & Automation Inc. introduced on Jan. 4 three sizes of large-frame contactors and overload relays with ratings in the 115-500 A range for both ac or dc motor control. These new contactors feature “Universal Current” coils that allow complete coverage of control voltages of 24-600 V ac and dc with just 13 coil ranges. Siemens E&A reports this wider coverage can reduce users’ inventories from the more typical 50-coil ranges.

Coil options for Sirius 3R contactors offer a choice of a standard coil plus three electronic coil versions. The latter options include coils with: 1) an interface for direct switching of a PLC without adding relays or PLC interfaces; 2) “Remaining Lifetime” indication that estimates contact erosion by a quick visual inspection, eliminating unplanned downtime due to worn contact tips; and 3) AS-Interface to accommodate digital communication.

The new large-frame, solid-state overload relays—available in starter or panel-mount versions—complement Siemens E&A’s new contactor sizes with ratings from 50 to 630 FLA (full load amperes).

For more information, visit www.sea.siemens.com or www.controleng.com/freeinfo .

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