Siemens SENTRON 3VA2063-8KQ42-0AA0 — 63 A MCCB with ETU860 Release
The Siemens SENTRON 3VA2063-8KQ42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated at 63 A continuous current Iu, with no derating across the full 40 °C to 70 °C operating range — the same 63 A holds at every temperature step, so you don't lose headroom in a warm enclosure. It carries the ETU860 electronic overcurrent release, configurable for line protection duty. The 440 kA interrupting rating at 240 V (330 kA at 415 V / 440 V, 220 kA at 500 V, 52.5 kA at 690 V) means it clears high-fault currents upstream of a distribution panel without cascading to the main breaker — sized for high-capacity transformer secondaries or busway feeds.
Dimensions are 140 mm wide by 181 mm high by 86 mm deep — the 4-pole width is the key fit check for existing MCCB buckets or DIN-rail adapters. IP40 on the front face protects against tool drops during commissioning; the rear and sides are unrated, so clearance to grounded metal per the manufacturer's mounting rules applies. The 86 mm depth (3.39 in) leaves room behind the panel door for wiring gutters or busbar stacks.
Communication and Accessory Provisions
This variant includes a communication function (fieldbus or Modbus interface via the ETU860), enabling power monitoring and remote trip indication. An optional motor drive extension is available for remote charging and closing. No undervoltage release or voltage trigger is fitted on this order code — those are separate add-on modules. The ground-fault monitoring version uses summation current formation on L + N conductors, so it detects leakage without a separate sensor core. Maximum power loss is 3 W — negligible for panel thermal budgeting.