NewElec’s LA motor protection relay provides superior thermal overload and phase unbalance protection in applications that would traditionally have used thermal bi-metal relays. This microprocessor-based electronic motor protection relay, designed to IEC 60255-8, provides overload protection for cyclic or sustained loads, as well as providing unbalance current and single phasing protection.
The integral three-phase current transformer module block, with 22 mm primary apertures, facilitates ‘straight through’ conductor routing from the main contactor to the electric motor in the range of 1 to 250 A.
The LA relays are available in four ranges and the auxiliary power supply input is terminal block selectable for 110 or 220 Volt ac. Potential free NO/NC output contacts are provided. The main trip relay is automatically configured fail safe so that auxiliary power loss will result in a trip condition.
The functional state of the relay is indicated by four LEDs on the control panel. These indicate overload, phase unbalance, in service and relay healthy. The overload level is adjusted on the ‘maximum load current dial’ and calibrated in amps.
The LA Series is manufactured to ISO 9001: 2000 Standards and provides stable operation with variable speed drives and soft starters.