What this MCCB does on the line side
Rated continuous current Iu is 40 A, and it holds that rating flat from 40 °C through 50 °C before it starts to derate: 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. Breaking capacity is the headline number here: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. The 690 V rating (17 kA) is lower but still useful for 600 V class systems in North America or 690 V industrial networks in Europe.
Trip unit and auxiliary configuration
Overcurrent release is a TM240 — thermal-magnetic, fixed-trip, no electronic adjustment. For a distribution feeder where the load is known and stable, that's fine; for variable loads or coordination-heavy designs, you'd want the electronic version. The integrated auxiliary trip uses order code 3VA9688-0BL30 if you need a replacement. No undervoltage release, no communication module, no phase failure detection, no ground fault monitoring — this is a basic distribution breaker, not a smart or selective device.
The 76.2 mm width is 3 modules at 25.4 mm each — standard for panel layout. Latching endurance is 15,000 operations — that's the mechanical life for the switching mechanism, not the electrical endurance under load (which will be lower depending on the current being interrupted).