That means if one phase drops on the line side, the breaker trips — no separate phase-loss relay needed.
This MCCB's interrupting rating is 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V tells you this is a 600 V-class frame — fine for 480 V or 600 V systems, but not the right choice for a 690 V motor circuit unless the available fault current is under 3.7 kA. For a typical 480 V panel with a 65 kA SCCR requirement, the 242 kA at 440 V gives plenty of headroom for series-rated coordination with a downstream contactor.
Integrated accessories — shunt trip and auxiliary switches
The shunt trip lets a remote E-stop or PLC output open the breaker without a manual handle pull — common in safety circuits or emergency-off chains. The two auxiliary switches give status feedback (open/closed) to a PLC or indicator lamp. No undervoltage release on this variant, so if you need UVR for a machine-start interlock, this isn't the order code.