Breaking capacity — the number that decides selectivity
This MCCB delivers 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. For a 400 V panel, 187 kA gives you headroom to coordinate with a downstream 25 kA or 36 kA MCCB without the main tripping on a feeder fault — selectivity stays intact.
Trip unit and protection features
The ETU330 electronic trip unit supports adjustable long-time pickup, short-time pickup, and instantaneous settings. It also includes ground-fault monitoring via summation current formation on the L-conductor — meaning it sums the phase currents to detect leakage to earth, which is useful on IT or TN-S systems where you want early warning before a bolted fault develops. No trip indicator, undervoltage release, or communication module is built in; those are external accessories if needed. The optional motor drive (product extension) allows remote charging for applications like generator paralleling or automatic transfer schemes.
The 40 A rating at 70 °C means this breaker doesn't force you to oversize the bus for a hot switchroom — it holds full rating up to that ambient. The IP40 front protection is standard for enclosed panels; if the breaker is mounted in a washdown area, the enclosure itself handles the IP rating, not the breaker face.