The TM-D unit provides overload protection (thermal element) and short-circuit protection (magnetic element), both field-adjustable via the trip unit dials. Breaking capacity is 50 kA Icu at 415 V AC (50/60 Hz) per EN/IEC 60947-2, which means it can safely interrupt a fault current up to 50 kA at that voltage without welding contacts or rupturing the case. At 480 V AC the UL rating also hits 50 kA Icu. This is an N-frame breaker — the N suffix in the device short name NSX100N indicates the 50 kA at 415 V AC breaking capacity class.
Integration notes
Front connection for both line and load sides; 35 mm connection pitch for busbar or cable lugs. IP40 enclosure protection (finger-safe, no water ingress) and IK07 impact resistance per IEC 62262. Pollution degree 3 per IEC 60664-1, overvoltage category III — suitable for fixed installations in industrial panels where conductive pollution or condensation may occur. 50,000 mechanical cycles and 30,000 electrical cycles at 440 V In give a solid duty life for distribution applications.