NewElec’s MA motor protection relay can be used either as a standalone device or as part of an automated process communicating to a PLC. The motor control relay is equipped with five digital inputs accepting field supply voltages from 24 V to 220 V AC or DC and four potential free C/O contacts, two of which are programmable.
Features available through the range 0,5 to 250 A include thermal curves (Class 3 to 40 seconds) to IEC 60255-8; three independent PTC 100 inputs; earth leakage; earth fault and short-circuit protection; load loss protection; over- and under-voltage protection; and voltage symmetry.
An integrated CT block includes the earth leakage core balance CT. Indication LEDs address the needs of maintenance personnel involved in fault finding, while the free NewElec frontend software enables recording of the motor performance.
The MA relay is ideally suited for converting an old plant to an automated one at substantially reduced costs by using existing control voltages. These are simply adapted for the MA Relay, which then communicates to a PLC via Profibus DP, Modbus RTU or Canbus.
Additional features include protection against thermal overloads, locked rotor, stall/jam conditions, unbalanced currents, single phasing and minimum load/underload protection.
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