Breaking capacity — what the L code means on the bus
The L breaking-capacity code means 150 kA Icu at 380/415 V AC 50/60 Hz per IEC 60947-2. At 440 V it's still 130 kA Icu. That's high-end interrupting performance for a 400 A frame — it clears severe fault currents without cascading upstream, which matters when you're coordinating a main or tie breaker in a switchboard. The Ics (service breaking capacity) mirrors the Icu at 415 V (150 kA), so the breaker can reclose after a fault at full rating, not a derated value. That's a real advantage for uptime on a critical feeder.
Mounting and integration notes
Fixed-mount, backplate installation. Front connection both top and bottom. The 140 mm width, 255 mm height, and 110 mm depth fit the standard ComPacT NSX cutout. Pollution degree 3 per IEC 60664-1 means it's rated for industrial environments with conductive pollution — no derating needed in a typical panel. IP40 front face, IK07 impact resistance. Overvoltage category III, suitable for distribution boards downstream of the utility transformer.
Standards and approvals
Dual-listed to EN/IEC 60947-2 and UL 60947-4-1 — covers both IEC and UL installations. Suitability for isolation confirmed per EN/IEC 60947-2. Class II shock protection on the front face. Rated insulation voltage 800 V AC, impulse withstand 8 kV. Electrical durability ranges from 3,000 to 12,000 cycles depending on voltage and load; mechanical durability 15,000 cycles.