Rated 250 A continuously at 40 °C, it holds that full rating through 50 °C before starting a gradual derating — 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C — so in a warm panel you still get most of the capacity. Breaking capacity is 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — enough to clear high-fault scenarios downstream of a large transformer without cascading upstream.
What the TM240 release and UVR mean for fit
The TM240 thermal-magnetic release combines a thermal bimetal for overload protection (inverse-time curve) with a magnetic coil for short-circuit instantaneous trip — no electronic adjustment, so it's a fixed-curve breaker suited to standard feeder or distribution duty where coordination studies are already done.
Measures 105 mm wide by 158 mm tall by 70 mm deep — standard SENTRON 3VA form factor for a 250 A frame, mounts on a DIN rail or panel-mount baseplate.