This breaker's interrupting rating is 330 kA at 240 V AC, dropping to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 3 kA at 690 V. At 415/440 V the 242 kA still covers most industrial main feeders. The sharp drop to 3 kA at 690 V means it's not intended for 690 V line-side protection; at that voltage you're relying on upstream fuses or a higher-rated breaker.
The 140 mm width occupies four 35 mm module spaces on the rail. No communication module means no slot reservation for bus couplers — just power in, power out.