The TM-D trip gives you fixed thermal and magnetic settings; no adjustment dials, no interchangeable trip blocks. At 50 A and 40 °C ambient it's your standard feeder breaker for a lighting panel, a small distribution board, or a subfeed off a larger switchboard. Breaking capacity is 50 kA at 415 V AC — that's the N performance level.
The 108 mm wide body takes up 12 module pitches at 9 mm each. Connection is front-to-front: line and load both terminate on the front face via compression lugs or busbars. Neutral is on the left. Pitch is 35 mm with spreaders, 27 mm without. IP40 front face, IK07 impact rating. This is a panel-mount breaker, not a DIN-rail snap-on; plan your enclosure layout accordingly.
Mechanical endurance is 20,000 cycles; electrical endurance depends on the load. At 440 V and full rated current (In/2) it's good for 20,000 cycles; at 440 V and full In it drops to 10,000 cycles. At 690 V it's 10,000 cycles at In/2 and 5,000 at In. That's typical for a molded-case breaker in distribution service — you're not cycling it daily like a contactor.