Its 187 kA interrupting capacity at 240 VAC gives substantial fault-current headroom for high-available-fault installations, while the 800 V rated insulation voltage suits it for 480Y/277 V and 600 V delta systems where the breaker must withstand line-to-line potentials across open contacts.
The interrupting rating drops with system voltage as expected: 187 kA at 240 VAC, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V.
The TM240 release holds full 250 A rating up to 50 °C ambient (–), then derates linearly to 223 A at 70 °C. Maximum power dissipation is 57 W — relevant for enclosed panel heat calculations, especially when multiple breakers are ganged. The 70 mm depth and 140 mm width fit standard SENTRON mounting footprints; verify busbar and lug kit compatibility for the 125 A frame.