The MA trip unit provides short-circuit (magnetic) protection only, with no thermal overload element, so it pairs with an external overload relay for coordinated motor branch protection. It carries a 50 kA Icu breaking capacity at 415 V AC (code N), and 90 kA at 240 V AC, per EN/IEC 60947-2. Rated 100 A at 65 °C, this breaker fits motor circuits up to that full-load current. The magnetic trip reacts to short-circuit faults, not overloads, so the downstream overload relay handles the thermal protection. That split is standard for motor starters where the contactor and overload relay manage running protection and the MCCB provides the fault-clearing backup.
For a 480 V AC system, the UL rating holds at 50 kA Icu, which covers most industrial motor branch panels. Utilisation category A means it's not intended for frequent switching under load — that's the contactor's job. The breaker sits upstream, ready to clear a fault. Electrical durability is rated at 50,000 cycles at 440 V at half rated current, 30,000 at full current, which is typical for a motor-protection MCCB in a panel that sees occasional switching for maintenance isolation.
Mounts flat on a backplate, accepts horizontal or vertical orientation. The 105 mm width per three-pole unit fits standard panel layouts. IP40 enclosure protection is adequate for clean indoor panels; the IK07 impact rating means it survives incidental tool strikes during panel assembly. The 5.2 W power dissipation per pole adds up to about 15.6 W total for the three poles, so account for that heat in a sealed enclosure.