What this 100 A MCCB delivers in a panel
The ETU320 gives you adjustable long-time and short-time pickup, plus instantaneous and ground-fault thresholds, all set via DIP switches on the front face without needing a separate programming tool. Breaking capacity climbs with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. Temperature derating is published: full 100 A up to 50 °C ambient, then 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. If your panel hits 60 °C near the top of the enclosure, you lose 7.5 A of headroom — plan the load accordingly.
The ETU320 electronic trip unit is the standard adjustable type for this frame.
