3rt20161ap02

It is a power contactor for motor control, designed to switch on and off three-phase loads, typically electric motors. In the acronym you wrote, the main data indicate a device with utilization category AC-3, rated current 9 A, motor power up to 4 kW at 400 V, 1 NO (normally open) auxiliary contact, 230 V AC coil, and construction size S00, i.e., a compact size often used in industrial switchboards.

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