SENTRON 3VA2 — 160 A MCCB with adjustable trip and high SCCR
The adjustable thermal-magnetic trip unit spans 240 A minimum to 1 920 A maximum, giving the specifying engineer a wide coordination window for downstream feeders or motor branch circuits. Short-circuit current ratings (SCCR) are published per voltage tier: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. The 4-pole construction suits three-phase systems with a fully rated neutral, typical in European TN-S or TT distribution where the neutral is switched and protected.
The 140 mm width is the 4-pole footprint. A communication function is built in, which on the 3VA2 platform typically means a modular communication-capable trip unit that can interface with fieldbus or Ethernet gateways for remote metering and trip indication. The ground-fault monitoring version uses summation current formation on L + N conductors — this is a residual-current detection method that sums phase and neutral currents to sense leakage, suitable for solidly-grounded systems where ground-fault coordination is required.