What this MCCB carries
The Siemens SENTRON 3VA2063-5JQ32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C, with a thermal-magnetic trip adjustable from 95 A minimum to 756 A maximum — that full-scale range means this frame can be tuned to protect a 63 A feeder or bumped up for a 756 A downstream bus if the application allows. Breaking capacity sits at 187 kA at 240 V AC, drops to 121 kA at 415/440 V, and holds 75.6 kA at 500 V — at 690 V it's still rated 3 kA, so this breaker handles high-fault commercial and industrial distribution panels without cascading upstream. It's built for line protection (feeder duty), not motor branch circuit protection — no undervoltage release fitted, but it does carry communication capability and a trip indicator, plus two auxiliary switches and one trip alarm switch (HQ type) for status feedback back to a PLC or SCADA.
Thermal derating and panel fit
Rated current holds flat at 63 A from 40 °C all the way to 70 °C — no derating curve to chase in a warm enclosure, which is rare for a compact MCCB frame and saves panel builders a frame size bump on hot days. Dimensions are 181 mm high, 105 mm wide, 86 mm deep (3.39 in). Maximum power loss is 5.4 W — negligible for thermal budgeting in a multi-breaker lineup, and the storage range of -40 to 80 °C covers unheated warehouses and container shipping.
Lifecycle and sourcing posture
The base switch variant is 3VA20635JQ320AA0 — that's the core breaker without the auxiliary switch kit; the -0AH0 suffix adds the HQ auxiliary switch configuration pre-installed from the factory, so it's a drop-in for designs that already call for two aux contacts plus a trip alarm.