What it is and what the ratings mean
The Siemens SENTRON 3VA2580-5KQ32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 800 A. That 800 A holds flat from 40 °C through 60 °C — no derating needed in a warm panel — before it steps down to 767 A at 65 °C and 703 A at 70 °C. The breaking capacity is the headline number here: 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V. At 415 V, that 121 kA SCCR means it can safely interrupt a fault up to that level without upstream devices needing to clear it — a real advantage for high-fault installations where you want selectivity without cascading. The electronic trip unit is an ETU860 — a fully programmable, communicating release that supports adjustable long-time (Ir from 0.5× to 1× Iu, tr from 0.5 to 25 s), short-time (Isd and tsd down to 0.05 s), and instantaneous protection. It also includes ground-fault monitoring via summation current formation on the line conductors. The communication function and other measurement functions are built in, meaning this breaker can feed power-quality data back to a BMS or PLC without an external meter.
Panel integration and physical fit
The breaker measures 210 mm wide, 320 mm tall, and 120 mm deep — a standard 3-pole MCCB footprint for this current class. It is designed for panel mounting, not DIN-rail snap-on. The IP40 protection on the front means it is protected against solid objects larger than 1 mm but not sealed against moisture; keep it inside a cabinet, not in a washdown zone. Maximum power loss of 135 W at rated current means you need to account for that heat in the enclosure thermal calculation, especially if the panel is densely packed. Operating temperature range is -25 °C to +70 °C, with storage from -40 °C to +80 °C. The 800 V rated insulation voltage (Ui) confirms it is suitable for 690 V line-to-line systems common in heavy industrial installations.
What it does not include
The product version is line protection only — no N-conductor protection is built in (the design is without N protection). That is typical for a 3-pole breaker on a 3-wire delta system; if you need 4-pole or neutral protection, this is not the variant.