What this MCCB delivers — 63 A continuous, 75.6 kA at 240 V
The Siemens SENTRON 3VA1163-3EF32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current (Iu) at 40 °C, with a TM240 thermal-magnetic release. Breaking capacity hits 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — so it handles high-fault utility feeds and large motor branch circuits where a standard MCB would weld shut. The 800 V rated insulation voltage (Ui) gives headroom for 480/600 V class panels. Front protection is IP40; the unit is designed for line protection (not feeder or generator).
Thermal derating and shunt trip
Full 63 A holds through 50 °C ambient. At 55 °C it derates to 60.48 A, at 60 °C to 59.22 A, at 65 °C to 57.96 A, and at 70 °C to 56.7 A — so a panel running at 60 °C ambient loses about 6% of the rating. The auxiliary release is a shunt trip (STL) with a dedicated order code 3VA9688-0BL30 for the integrated trip unit. No undervoltage release, no auxiliary contacts, no ground-fault monitoring, and no communication module on this variant. Operating range is -25 °C to +70 °C; storage from -40 °C to +80 °C. Latching endurance is 15,000 operations.
DIN-rail panel fit and footprint
Mounts on DIN rail via the SENTRON 3VA base. Dimensions: 130 mm height, 76.2 mm width (4 module spaces on a 18 mm/module rail), and 70 mm depth. The 76.2 mm width matches the standard 4-MU footprint for 3-pole MCCBs in this class — no surprises in a crowded enclosure.
Selectivity and coordination notes
TM240 release means the thermal element is fixed at 240 A frame rating with a 63 A continuous setting — so it coordinates downstream with 63 A rated feeders and upstream with a 240 A frame. The 75.6 kA at 240 V SCCR lets it sit on a high-capacity transformer secondary without cascading upstream breakers. For DC network applications, the device manual (referenced in the spec) covers the derating.