What this MCCB carries — and what that means for your panel
The Siemens SENTRON 3VA2063-5JQ32-0BA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full operating temperature range of -25 °C to 70 °C — no derating needed from 40 °C through 70 °C, which simplifies panel thermal calculations when the breaker sits next to other heat sources. The adjustable thermal-magnetic trip unit covers 95 A minimum to 756 A maximum, so this frame size handles everything from a modest feeder to a heavy downstream bus without swapping the breaker body — just dial the trip setting. Breaking capacity is the headline number that decides whether this breaker clears a fault or welds shut: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. At 415 V, that 121 kA SCCR covers most industrial transformer secondaries and large motor branch circuits without needing a current-limiting fuse upstream.
Built-in undervoltage release and ground-fault monitoring
This variant ships with an undervoltage release (UVR) as the auxiliary release — if the control voltage drops below the dropout threshold, the breaker trips immediately. That is standard for applications where a voltage dip must disconnect the load (conveyor interlock, emergency-stop chain, or generator transfer schemes). Ground-fault monitoring uses summation current formation on the L-conductor, meaning it measures vector sum of phase currents to detect leakage to earth. That is a common configuration for solidly-grounded systems where you want ground-fault protection without a separate GFCI module. A communication function is built in — the breaker can report status and trip events to a higher-level control system, which saves chasing a remote-indication relay later.
Lifecycle and sourcing posture
Pricing and availability are confirmed at quote time against an RFQ. This is a standard-catalog SENTRON MCCB, so lead times typically track the normal Siemens distribution cycle for the 3VA2 frame.
Panel fit — dimensions and mounting
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. The 86 mm depth (3.39 in) is shallow enough for shallow-backpan cabinets. Maximum power loss is 7.9 W, which keeps internal cabinet temperature rise manageable even in a sealed enclosure with multiple breakers ganged together.