What this MCCB delivers for the panel
The Siemens 3VA2580-5KQ32-0HH0 is a SENTRON molded case circuit breaker sized for 800 A continuous duty at 40 °C through 60 °C without derating — that is the full rated current Iu across the typical panel ambient range. At 65 °C it holds 767 A, and at 70 °C it holds 703 A, so the thermal margin is generous for a warm enclosure. The interrupting ratings are the headline: 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V. Those numbers mean this breaker can clear a fault at full short-circuit capacity without upstream cascading — critical for high-fault panels fed by large transformers. It carries the ETU860 electronic trip unit, which gives you adjustable long-time pickup (Ir up to 800 A), long-time delay (tr from 0.5 s to 25 s), and short-time delay (tsd from 0.05 s to 0.5 s). That selectivity tuning is what lets you coordinate downstream feeders without nuisance trips. The 3-pole design is configured for line protection (no N-conductor protection), and it includes ground-fault monitoring via summation current formation on the L-conductor. Communication function is onboard, so it can report status to a higher-level system.
Panel fit and mounting
The 3VA2580-5KQ32-0HH0 measures 210 mm wide, 320 mm high, and 120 mm deep. That 210 mm width is a standard 3-pole MCCB footprint — it will drop into the same mounting cutout as other SENTRON 3VA frames of this rating class. The IP40 front protection means it is suited for a clean indoor panel; no washdown rating, so keep it behind a sealed enclosure door in wet environments. Maximum power dissipation is 135 W at full rated current.
Lifecycle and sourcing posture
The latching endurance is rated at 10 000 operations — that is the mechanical life for the switching mechanism. For a main breaker that cycles infrequently (a few times a year for maintenance), that is effectively a lifetime rating. For a breaker used as a daily disconnect, it is still a solid figure.