The magnetic (I) element handles short-circuit protection, and the thermal (L) element handles overloads, so the trip unit is self-contained: no external relay needed for standard distribution. At 415 V AC, the Icu is 25 kA; at 440 V it drops to 20 kA, and at 500 V to 15 kA. The 25 kA code 'B' in the order code indicates the 415 V rating is the design target.
Mounts on a backplate in any orientation — horizontal or vertical, flat against the back. The 140 mm width, 161 mm height, and 86 mm depth fit standard distribution panel layouts. IP40 front face and IK07 impact resistance are adequate for indoor panel mounting where tools or dropped parts might strike the breaker. Not rated for washdown — keep it behind a sealed enclosure door if the environment is wet or dusty.