What this MCCB is and what it does
The Siemens 3VA1163-5EF32-0AG0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. It carries a rated continuous current Iu of 63 A across a 3-pole configuration, with a TM240 thermal-magnetic overcurrent release that handles both overload and short-circuit conditions without an external trip unit. The interrupting ratings tell you where this breaker can sit in the fault-current hierarchy: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA at 240 V means it can clear a bolted fault on a large step-down transformer secondary without upstream fuses needing to open first — useful for main or tie positions in high-fault panels. Thermal derating is mild up to 50 °C — the breaker holds 63 A flat. Above that it steps down: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your panel ambient runs above 50 °C, size the continuous load against the derated figure, not the nameplate 63 A.
Physical fit and panel integration
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm tall. That 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this current class — it fits existing SENTRON 3VA panel cutouts and bus-bar centers without adapter plates. Front-face protection is IP40, meaning it's sealed against tools and wires over 1 mm but not against water ingress. Suitable for indoor panel mounting in dry environments; not rated for washdown or outdoor exposure without an additional enclosure. Auxiliary contact version includes 1 auxiliary switch plus 1 trip alarm switch (HP type). The trip indicator on the front gives visual confirmation of a fault trip without needing to open the panel door — useful for maintenance walk-throughs.