At 690 V it drops to 4.5 kA, which tells you this is a 480 V class breaker, not for 690 V mains. Communication function is present, enabling integration with monitoring systems for load shedding or remote trip indication.
Integration — panel fit and wiring
The 105 mm width per pole (35 mm/pole) is typical for SENTRON 3VA frames; plan your DIN-rail or mounting-plate layout accordingly. The undervoltage release coil draws from the control circuit — verify polarity and voltage rating against your control transformer before wiring.
The interrupting curve at 240 V (242 kA) vs 415 V (187 kA) vs 500 V (121 kA) means you get full fault-clearing performance through 480 V systems — above that, the 4.5 kA at 690 V is a hard limit, not a derating. For 690 V applications, step up to a higher-voltage frame.