It's fitted with an ETU350 electronic overcurrent release and a shunt trip (STL) auxiliary release, plus a 2+1+1 auxiliary contact block (2 auxiliary switches, 1 trip alarm switch, 1 electrical alarm switch HQ). The interrupting ratings are the headline here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4 kA at 690 V — that 242 kA figure at 240 V tells you this breaker is sized for high-fault-capacity main feeders or large sub-distribution boards where the available fault current is serious. The 63 A rating holds flat from 40 °C to 50 °C, then derates stepwise to 53.55 A at 70 °C; if your panel ambient runs hot, that's the real continuous current you can count on.
What the ETU350 and auxiliary options mean for your BOM
The shunt trip (STL) allows remote tripping from a PLC or emergency-stop circuit. The auxiliary contact block includes a trip alarm switch and an electrical alarm switch, so you can signal both a normal open/closed status and a trip event back to the control system. No communication function, no phase-failure detection, no undervoltage release on this order code — if you need those, this isn't the variant.