It provides overload protection, phase failure detection, and locked rotor protection for three-phase motors. The tripping threshold is adjustable from 20 to 34 A, with a thermal protection adjustment range of 20 to 38 A, covering a practical band for medium-horsepower motors on 400/480 V systems. Phase failure sensitivity is under 3 seconds, meaning it will drop the motor fast enough to prevent single-phasing damage on a lost leg.
Rated operational voltage is 690 V AC 50/60 Hz for the power circuit per IEC 60947-4-1, and 600 V AC per UL and CSA — so it's rated for 480 V and 600 V class systems without derating. The relay offers multiple reset modes: automatic reset with a fixed 120-second delay, electrical reset by interrupting the supply for at least 0.1 seconds, and manual reset. The 120-second fixed delay prevents rapid restart cycling on a hot motor. Time range adjustments are available via knobs: 0.2 to 10 seconds for O-time (overload), 0.3 to 10 seconds for another O-time setting, and 0.5 to 30 seconds for D-time (delay). This lets you coordinate the trip curve with downstream contactors or upstream breakers.
Mounts directly on a contactor or on a DIN rail, making it straightforward to retrofit into an existing motor starter assembly without reworking the panel layout. Tightening torque is 2 N.m on the power circuit and 0.6 to 1.2 N.m on the control circuit lugs.