What this MCCB carries and where it fits
The Siemens SENTRON 3VA1163-4EF32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, with a breaking capacity of 121 kA at 240 V AC. That 121 kA figure at 240 V means it can safely interrupt very high fault currents in low-voltage distribution — typical for transformer-fed main feeders or large motor branch circuits where available fault current is high. The 63 A continuous rating holds steady up to 50 °C, then derates linearly to 58 A at 70 °C (–), so in a warm enclosure you still have headroom. The insulation voltage is rated 800 V, which covers 480Y/277 V and 600 V systems with margin. This is a line-protection design — meaning it is intended for cable and busbar protection, not direct motor overload protection (that would require a separate overload relay or a motor-protective breaker). It ships with an undervoltage release (UVR) fitted, so if control voltage drops, the breaker trips — a standard requirement for safety circuits that need to drop power on loss of control supply. The auxiliary switch block provides two auxiliary contacts plus one trip-alarm contact, enough to signal status and trip to a PLC or indicator lamp without an add-on module.
Dimensions and panel fit
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep (–). That 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this frame size — it fits the same panel cutout and DIN-rail adapter as other SENTRON 3VA1 breakers. The depth of 70 mm means it will clear a standard 200 mm deep enclosure with room for wiring and the UVR coil. Power loss is 19.8 W maximum, so thermal rise inside the panel is modest; no forced cooling needed in most layouts.
Environmental and compliance
Operating temperature range is -25 °C to 70 °C (–); storage range is -40 °C to 80 °C (–). That covers most indoor industrial environments, including unheated warehouses. The part carries a trip indicator for quick visual identification of a tripped breaker. No ground-fault monitoring version is fitted — this is a straight thermal-magnetic or electronic trip unit (line protection). Compliance documentation (RoHS, REACH, UL, IEC) is standard for the SENTRON series; the specific declarations are available on request.