What this 100 A MCCB does on a distribution board
The curve drops to 121 kA at 500 V and 3.7 kA at 690 V, so if you're on a 690 V corner-grounded delta system, the fault-handling margin tightens considerably.
Thermal performance across the panel ambient range
That simplifies the panel builder's thermal budget: you don't have to oversize the frame or add forced ventilation just to keep the breaker at its nameplate. The maximum power loss is 10 W, which is modest for a 4-pole 100 A frame and won't drive significant heat buildup in a well-ventilated enclosure.
What the ETU340 trip unit does for you
The ETU340 is an electronic overcurrent release with LSI protection: long-time (overload), short-time (short-circuit with delay), and instantaneous. The short-time delay lets you coordinate with downstream breakers for selective tripping — a fault on a branch feeder clears the branch breaker first, not the main. No ground-fault monitoring is built in, so if you need GF protection, you'll add an external module or specify the GF variant.