The electronic trip unit is an ETU340, a thermal-magnetic replacement that offers adjustable N-conductor protection (OFF, 50%, or 100% of the phase current).
This breaker is rated for 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. The steep drop at 690 V (4.5 kA) tells you the arc-chamber design is optimized for low-voltage distribution up to 500 V; at 690 V it still interrupts but the capacity is much lower — verify your fault current at that voltage level before specifying.
Physical integration
It mounts into a panel or enclosure with standard MCCB cutout and bus-bar connections. The 4-pole design covers three-phase + neutral, with the N-conductor protection adjustable via the trip unit settings.
