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
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.