63 A MCCB with 187 kA interrupting capacity at 240 V
The Siemens 3VA2163-5HL32-0JH0 is a SENTRON 3VA2 series molded case circuit breaker rated for 63 A continuous current (Iu) across 40 °C to 50 °C ambient, with no derating needed in that band. Above 55 °C it steps down linearly to 53.55 A at 70 °C. That 63 A rating holds for the line protection version, meaning it's configured for feeder or main breaker duty rather than motor protection — no phase-failure detection, no communication module, no ground-fault monitoring built in. Interrupting capacity hits 187 kA at 240 V, drops to 121 kA at 415 V and 440 V, then 79 kA at 500 V, and 4.25 kA at 690 V. That 187 kA figure at 240 V is the headline number — it tells you this breaker can sit at a high-fault panelboard or transformer secondary without cascading upstream. The 4.25 kA at 690 V is the weak leg; if your system runs 690 V with fault current above that, you need a different frame or series.
ETU320 release and integrated shunt trip
The overcurrent release is an ETU320 electronic trip unit — adjustable, with LSI curves (long-time, short-time, instantaneous). The auxiliary contact configuration ships as 2 auxiliary switches plus 1 trip alarm switch (HQ designation). A shunt trip release (STL) is integrated, part number 3VA9688-0BL32, for remote tripping via a control voltage. The base switch is 3VA2163-5HL32-0AA0; the -0JH0 suffix adds the shunt trip and the specific aux contact block. Rated insulation voltage is 800 V, so it's comfortable in 480/277 V and 600 V panels. Power loss maxes at 4 W — negligible for thermal budgeting inside a closed enclosure. Mechanical endurance is 20,000 operations, which is typical for a 63 A MCCB frame; it's not a switching device for frequent cycling, it's a protection device.
Dimensions and panel fit
Footprint: 105 mm wide, 181 mm tall, 86 mm deep. That 105 mm width is the 3-pole frame width for the 3VA2 63 A frame — it's the same physical envelope as other 3VA2 63 A three-pole breakers, so swapping within the family doesn't require re-drilling the mounting plate or re-routing busbars. Depth of 86 mm includes the handle and terminal protrusion; plan for front-access wiring clearance.