What this 800 A MCCB carries
The Siemens SENTRON 3VA2580-5HL32-0KL0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current rating of 800 A across the ambient range from 40 °C to 60 °C with no derating — at 65 °C it still holds 767 A, and at 70 °C it holds 703 A. The interrupting capacity is 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — high enough for most main service entrance or large feeder applications where fault currents are substantial. It uses an ETU320 electronic trip unit with adjustable long-time pickup (Ir) from 320 A to 800 A and instantaneous pickup (Ii) from 1,200 A to 8,000 A, plus adjustable long-time delay (tr) from 0.5 to 17 seconds.
Maximum power loss is 135 W, which matters for thermal management inside a sealed enclosure — factor that into your ventilation or derating calculations if the panel runs warm.
Rated insulation voltage is 800 V, operating range from -25 °C to 70 °C, storage from -40 °C to 80 °C, and mechanical endurance is 10,000 operations — figures that match the SENTRON 3VA series specification. If you need those, you'd look at a different 3VA2 option code.