Above 55 °C the thermal curve begins to pull back: 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C. That matters if your enclosure runs hot — you lose roughly 2 % per 5 °C above 50 °C, so a panel at 65 °C derates the breaker to 376 A, and the downstream load must be sized accordingly. The interrupting ratings are the headline: 220 kA at 240 V, 154 kA at 415 V and 440 V, 121 kA at 500 V, and 17 kA at 690 V.
TM240 overcurrent release and line protection design
The overcurrent release is designated TM240 — a thermal-magnetic type tuned for line protection (cable, busbar, distribution). It is not a motor-protection breaker (no adjustable magnetic pickup for inrush), so it belongs in a distribution board or feeder circuit, not directly upstream of a motor starter. Maximum power loss is 92.1 W at rated current — that heat must be vented in a sealed enclosure.
Dimensions: 248 mm height, 184 mm width, 110 mm depth. The 4-pole body is 184 mm wide — that is the standard 4-pole MCCB footprint for a 400 A frame, so it fits existing cutouts and busbar spacing designed for that class. Depth at 110 mm is shallow enough for most 300 mm deep enclosures with wiring space behind. If your circuit requires UVR or GF protection, you need a different suffix in the 3VA1 series. The TM240 release is fixed — no interchangeable trip units on this order code.