63 A MCCB with shunt trip — line protection for distribution panels
The Siemens SENTRON 3VA2063-5HL32-0JA0 is a 3-pole molded case circuit breaker rated 63 A continuous across the full ambient range from 40 °C to 70 °C — no derating needed in a warm enclosure. It carries an interrupting capacity of 187 kA at 240 VAC, stepping down to 121 kA at 415/440 V and 75.6 kA at 500 V, with a 3 kA floor at 690 V. That 187 kA figure at 240 V means it handles high available fault current on the secondary side of a typical 480/277 V step-down transformer without cascading upstream breakers. The built-in shunt trip (STL) release lets a safety circuit or remote pushbutton trip the breaker independently of the overload curve — useful for emergency-off or interlock schemes on packaging lines where a downstream jam needs to kill power fast.
Sizing and selectivity — what the ratings mean for panel coordination
Rated insulation voltage of 800 V gives headroom for 480/277 V and 600 V systems without de-rating the internal clearances. The 63 A frame holds steady regardless of enclosure ambient up to 70 °C, which simplifies thermal coordination in a crowded panel — no need to oversize the frame for a 50 °C internal temperature. Power loss is 5.4 W maximum, low enough that multiple breakers in a row won't drive the internal temperature rise above the panel designer's budget. The operating range of -25 °C to 70 °C covers unheated warehouses and hot machine cabinets alike.
Mounting and integration — fits standard panel footprints
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard 3-pole MCCB footprint that drops into most distribution panelboards and motor control center buckets without re-drilling the mounting plate. The 105 mm width matches the typical 3-pole SENTRON 3VA frame spacing, so a panel laid out for a 63 A 3VA will accept this unit with no bus-bar rework. No communication function on this variant; it's a straight line-protection breaker with a shunt trip for remote tripping.