The magnetic short-circuit pickup is fixed on the TM-D; no adjustment dial, which simplifies spec'ing for distribution boards where you want a predictable instantaneous trip. Mounts to a backplate (not DIN rail), accepts front-front connections, and is rated IP40 with IK07 impact resistance. The 4P version has the neutral on the left, configured for 3D protection (no neutral overload protection) per — confirm your system needs a protected neutral or if a 3D setup suffices.
The C25H6TM250 is listed as current production. No end-of-life notice, no last-time-buy date. That means it's still a standard catalog item from Schneider — no need to hunt surplus or worry about a looming obsolescence on a new panel design.
Electrical endurance: 20,000 cycles at 440 V at half rated current, 10,000 cycles at full 440 V rated current. Mechanical endurance is 20,000 cycles. That's typical for a molded-case breaker in distribution duty — not a switching device for frequent motor starts, but fine for infrequent manual switching and fault clearing.