Rated 200 A continuous at 40 °C, it holds that current up to 50 °C before derating to 176 A at 70 °C — so in a hot panel near a kiln or furnace, you still get 176 A without tripping on ambient alone. That 187 kA figure at 240 V covers high-fault utility feeds; the 17 kA at 690 V still clears most industrial fault levels on 690 V distribution.
Sizing and ambient derating
The TM240 release is a fixed thermal-magnetic unit — no interchangeable trip block. Full 200 A rating holds through 50 °C; above that, derate linearly to 176 A at 70 °C. If your panel ambient runs 55 °C, the breaker is good for 194 A continuous. That derate curve is the number that governs real-world sizing, not the 200 A nameplate.
The breaker measures 70 mm deep, 140 mm wide, and 158 mm high. The 70 mm depth leaves clearance for rear-connected busbars or a shallow enclosure.