Thermal derating — the real-world current you can actually run
At 55 °C it derates to 31 A, holds there through 60 °C, then drops to 30 A at 65 °C and 70 °C. That's a clean, predictable curve — no surprise trip at the top of a hot summer day in a non-conditioned electrical room.
Dimensions are 101.6 mm wide (4 in), 130 mm tall (5.12 in), and 70 mm deep (2.76 in).
For a BOM freeze or a line-down replacement, the key fit parameters are the 32 A TM240 release, the 4-pole configuration, and the 187 kA interrupting rating at 240 V — confirm those match your existing coordination study and the page is good to order against an RFQ.