What you're looking at
The 'TM' means fixed thermal and magnetic settings, no interchangeable trip — what you see is what protects the circuit. Breaking capacity is the headline here: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA up at 690 V. That's a high-interrupting rating for a 40 A frame — it handles fault currents that would vaporize a standard MCB.
Thermal derating — the real-world rating
At 55 °C it drops to 39 A, at 65 °C to 38 A, and at 70 °C it's 37 A.
Panel fit and auxiliary options
Dimensions: 130 mm tall, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures.