What the interrupting capacity means for your panel
The Siemens 3VA1163-3EF32-0AH0 is a SENTRON molded case circuit breaker rated for 63 A at 40 °C with a TM240 thermal-magnetic release. The interrupting capacity is 75.6 kA at 240 V AC, stepping down to 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 75.6 kA figure at 240 V tells you this breaker can safely clear a fault up to that level without rupturing — critical for high-fault panels near large transformers or in industrial mains distribution. The 3-pole design and 800 V rated insulation voltage suit it for three-phase line protection in switchboards and distribution boards.
Thermal derating and continuous current
The breaker holds full 63 A rating up to 50 °C ambient. Above that, it derates: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. If your panel runs hot — say near a drive or in a poorly ventilated enclosure — you need to account for that drop. The maximum power loss is 17.3 W, which contributes to the internal heat rise. Mounting in a standard 70 mm deep by 76.2 mm wide DIN-rail footprint; the 130 mm height fits most distribution board cutouts.
Environmental and storage limits
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The wider storage window means the breaker can sit in a cold warehouse or hot container without damage — relevant for spares held on the shelf. The trip indicator is present, and there is no undervoltage release, no ground-fault monitoring, and no communication function on this variant.