What this breaker does and where it fits
The Siemens 3VA2440-5KQ32-0DF0 is a 3-pole IEC frame 630 molded case circuit breaker with a 400 A nominal rating and an Icu of 55 kA at 415 V — that is the maximum short-circuit current it can safely interrupt without damage, so it belongs in a main or feeder position where fault current is high enough to cook a lesser breaker. The ETU860 trip unit gives you LSIG protection — long-time (overload), short-time, instantaneous, and ground-fault — with adjustable Ir from 160 A to 400 A, Isd from 0.6 to 10 x In, and Ii from 1.5 to 15 x In. Ground-fault pickup Ig is adjustable from 0.2 to 1 x In with a time delay tg of 0.05 to 0.8 s, which lets you coordinate downstream without nuisance tripping on motor inrush. It ships with an undervoltage release (UVR) rated 208–230 V AC 50/60 Hz, one auxiliary switch HQ, and one trip alarm switch HQ. The UVR drops the breaker if control voltage falls below dropout — standard for emergency-stop circuits and safety disconnects where loss of control power must kill the load.
Lifecycle and sourcing posture
We source and quote the 3VA2440-5KQ32-0DF0 to order against an RFQ. Availability and current pricing are confirmed at quote time through our independent distribution network.