Motor branch circuit breaker – magnetic-only trip
This ABB 1SDA068115R1 is an XT4N 160 MA 32 motor protection circuit breaker. The magnetic-only (MA) trip unit provides adjustable short-circuit protection (Im 160–320 A), while thermal overload protection is delegated to an external overload relay – standard practice for motor feeders where the contactor and relay handle the time-current curve.
Ratings & selection notes
In is 32 A, Iu is 160 A; rated voltage 690 V at 50/60 Hz; MA trip adjustable 160–320 A.