What this breaker carries
The Siemens 3VA2580-5MN32-0BL0 is a 3-pole IEC frame 1000 molded-case circuit breaker with a 55 kA breaking capacity at 415 V (class M). It is fitted with an ETU350M electronic trip unit configured for motor protection — LSI curves, with overload protection Ir adjustable from 320 A to 800 A and short-circuit protection Isd from 3 to 15 × Ir. The instantaneous pickup Ii is fixed at 15 × In (800 A). This unit also includes an undervoltage release rated 24 V DC, an accessory that drops the breaker when control voltage is lost.
Deployment and panel fit
This breaker is designed for IEC switchgear assemblies — typically mounted on a DIN rail or bolted into a panel bus. The frame 1000 footprint matches standard 3VA2 distribution boards and motor control centers. The undervoltage release is wired to a 24 V DC control circuit; losing that signal trips the breaker, which is the usual arrangement for emergency-stop or undervoltage protection on motor feeders.