The TM-D trip provides L (thermal) overload protection and I (magnetic) short-circuit protection, a straightforward curve for distribution feeders and motor branch circuits that don't need electronic adjustability. At 220/240 V it rises to 100 kA Icu; at 690 V it drops to 10 kA Icu. The H suffix in NSX100H signals this high-breaking variant — the standard NSX100 would carry a lower interrupting rating. The 105 mm width and 161 mm height fit standard MCCB panel cutouts.
Standards and compliance — what the approvals certify
The suitability-for-isolation marking means you can safely use it as a disconnecting means under lockout/tagout — the open contacts provide a visible gap that meets IEC 60947-2 isolation requirements. Overvoltage category III confirms it's rated for fixed-installation distribution panels, not for downstream equipment-level protection.
Durability and thermal budget
Mechanical durability is rated at 50,000 cycles; electrical durability varies with load: 50,000 cycles at 440 V at half rated current (In/2), 30,000 cycles at full 440 V In, and 10,000 cycles at 690 V In. For a panel that sees frequent switching — say a compressor cycling several times an hour — these numbers set the maintenance interval. Power dissipation per pole is 8.77 W, so at 80 A full load the three poles together shed about 26 W inside the enclosure. That heat needs to be factored into the panel's thermal design, especially in a sealed cabinet.