MCCB for line protection with TM240 release
The 3VA1120-4EF42-0AA0: Rated 20 A continuous at 40 °C through 55 °C, derating to 19 A at 60 °C and above — the full thermal curve is published, so no guesswork when the panel ambient runs hot. Interrupting capacity is 121 kA at 240 VAC, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500/690 V. That 121 kA at 240 V means it handles high-fault scenarios on 240 V distribution without cascading upstream — critical for selectivity in a data-center or industrial feeder. Insulation voltage rated 800 V, IP40 protection on the front face — suitable for enclosure mounting where the front is behind a panel door.
Integration and panel fit
Dimensions: 70 mm deep, 101.6 mm wide, 130 mm tall. The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in the 3VA frame — verify DIN-rail or screw-mount clearance in your enclosure. No undervoltage release, no communication module, no ground-fault monitoring on this variant. Maximum power loss is 12 W — account for that in your thermal budget if the breaker is tightly grouped in a multi-unit panel.