The Siemens SENTRON 3VA2580-5JP32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for 800 A continuous current at 40 °C, with an ETU550 electronic trip unit providing adjustable long-time, short-time, and instantaneous protection — the core overcurrent release for line protection in distribution panels. Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — figures that give the breaker substantial SCCR headroom for high-fault industrial services, meaning it can clear a bolted fault at those levels without cascading upstream. The frame is sized at 210 mm wide, 320 mm high, and 120 mm deep, which governs the panel cutout and bus-bar spacing required for installation.
Thermal derating and trip unit
The breaker holds its full 800 A rating from 40 °C through 60 °C ambient; above that it derates to 767 A at 65 °C and 703 A at 70 °C — a curve that matters when the MCCB is enclosed in a warm switchboard or stacked with other heat sources. The ETU550 electronic trip unit offers an adjustable long-time pickup (Ir) from 0.5 to 1.0 × In (400–800 A), a short-time delay (tsd) adjustable from 0.05 to 0.5 s, and a long-time delay (tr) from 0.5 to 25 s — enabling selective coordination with downstream breakers.