The Siemens 3VA1163-4EF32-0AE0 is a SENTRON-series 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) from 40 °C through 50 °C ambient. That's the full 63 A all the way up to 50 °C — no derating needed in most panel interiors. At 55 °C it still carries 60.48 A, and at 70 °C it holds 56.7 A, so it's built for warm cabinets without stepping up a frame size.
Interrupting capacity by voltage
This MCCB delivers 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That's a very high interrupting rating for a 63 A frame — it handles faults that would weld a standard industrial breaker shut, so it's suited for high-fault substation feeds or large transformer secondaries where the available short-circuit current is substantial.
Thermal-magnetic release and auxiliary contacts
The overcurrent release is a TM240 — thermal-magnetic, fixed-trip, no electronic adjustment. That makes it a straightforward line-protection breaker: thermal element handles overloads, magnetic coil handles short circuits. It comes with four HQ auxiliary switches built in, so you get status feedback without bolting on an external block. No undervoltage release, no ground-fault monitoring, no communication module — this is a clean, non-communicating breaker for standard distribution.
Mounting and panel fit
The 3VA1163-4EF32-0AE0 measures 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB footprint for DIN-rail or screw-mount panel integration. The front face carries an IP40 protection rating, which is typical for enclosed panel mount; no washdown rating, so keep it behind a gland plate or cabinet door.