What this MCCB is and what it does
The Siemens SENTRON 3VA2063-5KP36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, designed for line protection in distribution panels. It carries an ETU850 electronic trip unit — that's the microprocessor-based release that gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, not a fixed thermal-magnetic response. The 63 A rating holds flat across the entire operating temperature range from -25 °C to 70 °C, so no derating is needed in a warm enclosure.
Breaking capacity — what the numbers mean for coordination
This breaker's interrupting capacity varies by system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. The 187 kA figure at 240 V is the headline number — it tells you this MCCB can safely clear a fault up to that level without rupturing, which matters for high-fault-capacity service-entrance or industrial feeder applications. At 690 V the capacity drops to 3 kA, so verify the available fault current at your operating voltage before specifying.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. The 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it occupies three 35 mm DIN-rail modules worth of panel width. Depth of 86 mm includes the arc chamber and termination hardware; verify clearance behind the panel door for the rotary handle or extended terminals if used. Front face carries IP40 protection, meaning tools and fingers are kept out, but it is not sealed against water ingress.