SENTRON 3VA2 — 40 A line protection with ETU320 trip
It carries the ETU320 electronic overcurrent release, which provides adjustable thermal-magnetic or electronic trip characteristics depending on the specific release variant — here configured for fixed line protection without communication or ground-fault monitoring. The breaker's insulation voltage is rated at 800 V, and its breaking capacity reaches 440 kA at 240 V, 330 kA at 415/440 V, 220 kA at 500 V, and 52.5 kA at 690 V, giving it substantial fault-interrupting headroom across common industrial voltage levels.
Breaking capacity and selectivity coordination
At 415 V (common European industrial supply), the 330 kA rating still provides strong selectivity headroom against downstream breakers. For a 40 A frame, these are aggressive SCCR figures; the ETU320 release's adjustable trip settings let the engineer coordinate time-current curves with downstream devices rather than relying solely on the high instantaneous break.
The 4-pole format (3 phases + neutral) fits European TN and TT systems where neutral switching is required; for a 3-pole-only panel, the 3VA2 family offers variants without the fourth pole.