What this MCCB carries and where it fits
The Siemens SENTRON 3VA1163-3EF36-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. It is designed for line protection in distribution panels and motor branch circuits, with an interrupting capacity of 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — covering the full range of common low-voltage fault levels across IEC and UL installations.
Ratings that govern the selection
The 63 A rating holds flat from 40 °C to 50 °C, then derates to 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 — so in a warm enclosure the breaker still delivers nearly full current without nuisance tripping. The TM240 release means the thermal pickup is fixed at 240 A short-circuit threshold; the magnetic trip is non-adjustable. An undervoltage release (UVR) is integrated (order code 3VA9608-0BB11 for the auxiliary trip), which allows remote shunt-trip or undervoltage protection — useful for emergency-stop circuits or voltage-supervised disconnects.
Panel integration and footprint
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without special adapters. The front face carries IP40 protection (finger-safe), adequate for enclosed distribution boards. No auxiliary contacts are fitted as standard; the UVR is the only integrated auxiliary release.