Its MA (magnetic-only) trip unit is rated 150 A at 65 °C and provides short-circuit protection only — no thermal overload element, so an external overload relay must be wired in series for the motor branch circuit. The 3-pole configuration (3D protected poles) suits three-phase motor loads. Breaking capacity is the headline selector: 85 kA Icu at 240 V AC, 36 kA at 415 V AC, and 35 kA at 480 V AC (UL 60947-4-1). At 690 V AC it still holds 8 kA Icu. The MA trip unit is adjustable magnetic-only, meaning it responds to short-circuit current but ignores overload. This is deliberate for motor circuits where the overload relay handles thermal protection.
Connection pitch is 35 mm between poles. Front-facing terminals on both upside and downside simplify busbar and cable routing in a distribution panel.
Electrical durability and duty cycle
Mechanical durability is 40,000 cycles. Electrical durability depends on the switched current: 40,000 cycles at 440 V at half rated current (In/2), 20,000 cycles at 440 V at full In, and 7,500 cycles at 690 V at full In. For motor-starting duty (Category A utilization), these numbers give a realistic service life estimate before contact maintenance. Power dissipation per pole is 8.55 W at rated current — 25.65 W total for the 3-pole breaker. This matters for enclosure thermal rise calculations when grouping multiple breakers in a panel.