The TM-D thermal-magnetic trip unit handles overloads (thermal) and short-circuits (magnetic) in one block, with a fixed magnetic trip threshold of 4000 A. That magnetic setting means the breaker holds through motor inrush and transformer energization up to roughly 6.3× In, then clears hard faults above that point. Breaking capacity is 36 kA Icu at 440 V AC 50/60 Hz per IEC 60947-2, and 40 kA Icu at 220/230 V AC. The N breaking capacity code places it in the standard-interrupting range for the EZC family, adequate for most secondary distribution panels not directly on the utility transformer secondary.
Fixed-mount design with backplate mounting support — no DIN-rail adapter on this frame size. The 140 mm width and 255 mm height fit standard panel cutouts for a 630 A frame MCCB. Connection pitch is 45 mm, matching common busbar drilling patterns for this ampacity class. IP20 finger protection on the front face is standard; the IK07 impact rating means the enclosure withstands a 2 J hammer blow — enough for accidental tool contact during panel work.
Mechanical durability is rated at 10,000 cycles; electrical durability at 3,000 cycles under 415 V AC Category A load per IEC 60947-2. Category A means the breaker is not intended for frequent switching of motor loads — it is a distribution breaker, not a contactor replacement. For applications requiring frequent on-load switching, a contactor in series with this MCCB is the standard topology. The suitability-for-isolation marking (yes, per IEC 60947-2) means the breaker can serve as a visible-break disconnect for lockout/tagout procedures, provided the positive contact indication is verified.