The ABB TA200DU200 is a 3-pole NEMA thermal overload relay from the A-Line family, with an adjustable trip range of 150 to 200 A. It protects motor circuits by sensing overcurrent through a bimetallic element and opening a control contact before the motor windings exceed their thermal limit. The 200 A maximum setting means it pairs with a contactor or starter sized for a motor drawing full-load current up to that value — typical for a 100–150 HP motor at 480 V, depending on service factor and duty cycle.
The 150–200 A adjustment range covers motor full-load currents across a 50 A window — set the dial to the motor nameplate FLA, not the maximum. The 3-pole NEMA form factor means it mounts to a NEMA-style contactor or starter base via the A-Line interface; it is not a DIN-rail module and does not fit IEC contactors without an adapter. The bimetallic element responds to heating from all three phases simultaneously, so a phase-loss condition on a lightly loaded motor may not trip it — use a phase-voltage monitor if single-phasing protection is required.