What this 4-pole MCCB switch disconnector does
The Siemens 3VA1163-1AA42-0KA0 is a SENTRON 3VA1 molded-case switch disconnector — not a full-function MCCB with trip curves, but a load-break switch rated to make and break circuits under load. Its 4-pole design (3 phases + neutral) handles 63 A continuously across the full ambient range from 40 °C to 70 °C without derating, which means it holds its rating in a hot enclosure or near a curing press without needing a larger frame. Rated 690 V AC 50/60 Hz and 600 V DC, it covers both standard AC distribution and DC bus applications up to that voltage.
Shunt trip and switching duty
This variant includes a shunt trip release (STL) for remote emergency-off or controlled disconnection — a voltage-triggered coil that opens the switch when energized. It has no undervoltage release, no auxiliary contacts, and no communication module. The mechanical service life is 15 000 switching cycles typical, which suits infrequent isolation rather than daily motor starting. For higher-cycle applications, a contactor would be the better choice.
Mounting and connections
Front terminals accept busbar connection for the main circuit, with an IP40 rating on the front face — suitable for enclosed panel mounting where tools are the only access. The 70 mm depth and 101.6 mm width fit standard SENTRON 3VA1 panel footprints. Storage range spans -40 °C to 80 °C; operating range is -25 °C to 70 °C. Maximum power loss is 38 W at rated current.